Original Research Article
Maryam Abrishamkar; Rashin Andayesh; Hossein Hodaee
Abstract
Via Box-Behnken method, we evaluated the influence of various factors on absorption, including the amount of absorbent, the speed of stirring the solution and absorbent, pH of solution, time of contact, and various concentrations of violet methyl colour, to obtain optimum conditions. The maximum extent ...
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Via Box-Behnken method, we evaluated the influence of various factors on absorption, including the amount of absorbent, the speed of stirring the solution and absorbent, pH of solution, time of contact, and various concentrations of violet methyl colour, to obtain optimum conditions. The maximum extent of violet methyl removal was found at 100 mg/L concentration, pH = 4.6, contact time = 50 minutes, 120 rotation speed, and absorbent dose = 1.488 g/L (0.0744 gram in 50 millilitre). In order to determine the reaction mechanism, two kinetic models were used, namely pseudo-first-order and pseudo-second kinetics models. The adsorption kinetics followed pseudo-second order model, and the mechanism of chemical reaction was the rate-limiting step. Furthermore, the Langmuir and Freundlich Isotherms were considered for absorbing the violet methyl on the palm fiber absorbent. The adsorption isotherms showed a balanced relationship between the materials adsorbed on the adsorbent (qe) and a balanced concentration in the solution (Ce) at a constant temperature. This method was used to remove the violet methyl colour from real samples such as industrial sewage, tap and river water.
Short Communication
In Sang Lee; Sitansu Sekhar Nanda
Abstract
The current ongoing scientific debate deals with accumulation of hydronium ions (H3O+) on water surface. Elevated interfacial concentration measured by using Raman spectroscopy. A strong surface affinity of H3O+ indicated by Raman spectroscopy under similar conditions. Ion adsorption phenomena, H3O+ ...
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The current ongoing scientific debate deals with accumulation of hydronium ions (H3O+) on water surface. Elevated interfacial concentration measured by using Raman spectroscopy. A strong surface affinity of H3O+ indicated by Raman spectroscopy under similar conditions. Ion adsorption phenomena, H3O+ formation and its structural activity emphasized in our study. Asymmetric water ion adsorption clearly observed in our research.
Original Research Article
Abdelsalam Asweisi; Rihab Hussein; Nabil Bader; Rajab Elkailany
Abstract
Propylene oxide-ethylene oxide block polymer (PO-EO) is a surfactant with low cloud point. It has been used for separation of Cu2+, Fe3+, Mn2+, Cd2+ and Cr3+ ions in aqueous media. The effect of different factors on recovery percent, like pH, temperature, amount of chelating agent, and amount of surfactant ...
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Propylene oxide-ethylene oxide block polymer (PO-EO) is a surfactant with low cloud point. It has been used for separation of Cu2+, Fe3+, Mn2+, Cd2+ and Cr3+ ions in aqueous media. The effect of different factors on recovery percent, like pH, temperature, amount of chelating agent, and amount of surfactant have been studied. A very good separation of metal ions could be achieved at different pH values with good effeciency of separation under the optimum conditions. The analyses of metal ions were carried out using flame atomic absorption spectrometer with duterium lamp background correction and calibration curve method curve method.
Original Research Article
Jalindar Gahininath Lohkare; Shujat Hussain Quadri; Laxamn Appa Dhale; Ketankumar Ambadasrao Ganure
Abstract
Nanocrystalline CoyZn1-yHozFe2-zO4 (where y = 0.0, 0.25, 0.5, 0.75, 1.00 and z=0.0, 0.03, 0.06, 0.08, 0.1) ferrites were prepared by sol-gel auto combustion method at pH of 8. Samples were obtained by annealing at relatively low temperature 600 °C for 4 h and characterized by thermo gravimetric/differential ...
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Nanocrystalline CoyZn1-yHozFe2-zO4 (where y = 0.0, 0.25, 0.5, 0.75, 1.00 and z=0.0, 0.03, 0.06, 0.08, 0.1) ferrites were prepared by sol-gel auto combustion method at pH of 8. Samples were obtained by annealing at relatively low temperature 600 °C for 4 h and characterized by thermo gravimetric/differential thermal analysis (TG/DTA) all the samples were annealed at 600 °C for 4 h. The prepared samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Fourier transform infrared (FT-IR) spectroscopy. Particle size measured from XRD and TEM are in good agreement with each other. The TEM study reveals the fine particle nature of the ferrites with little agglomerations. The cation distribution suggests that Zn2+ ion mainly on tetrahedral-A sites, Ho3+ ions shows strong preference towards octahedral-B site, Co2+ and Fe3+ ions are randomly distributed at the tetrahedral-A and octahedral-B site. FT-IR study confirmed two main absorption bonds in the frequency range 400-600 cm-1, assigned due to the tetrahedral-A and octahedral-B stretching vibrations.
Original Research Article
Olivia Hanaa Raouf; Samy Selim; Hussein Mohamed; Omayma Fawazy Abdel-Gawad; Ali Mahmoud Elzanaty; Sayed Abdel-Kader Ahmed
Abstract
Modification of chitosan any Schiff base reaction with acetophenone derivatives was done. Fourier transformer infrared analysis (FT-IR), scanning electron microscope (SEM), and X-ray diffraction (XRD) were used as the appropriate characterize the Schiff base derivatives. Thermal behavior of the prepared ...
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Modification of chitosan any Schiff base reaction with acetophenone derivatives was done. Fourier transformer infrared analysis (FT-IR), scanning electron microscope (SEM), and X-ray diffraction (XRD) were used as the appropriate characterize the Schiff base derivatives. Thermal behavior of the prepared materials was also studied. Various biological activities were examined for the prepared materials antimicrobial activity including antibacterial (studied against Streptococcus sp. Bacillus subtilis and Sarcina lutea as an example for gram-positive bacteria and Pseudomonas aeruginosa and Escherichia coli as an example for Gram-negative bacteria), anti-fungal (against Candida albicans) and anti-protozoal (against Trypanosoma cruzi and Leishmania donovaniwas). Antioxidant activity of chitosan and its Schiff base derivatives was detected using the FRAP and DPPH techniques. Colon carcinoma (Colo 205), hepatocellular carcinoma (Hep G2), urinary bladder carcinoma (T24P) and embryonic kidney adenocarcinoma (293) used to examine the anticancer activity of chitosan and its modified derivatives. The new chitosan Schiff base derivatives showed superior anti-bacterial, antifungal, anti-protozoal and antioxidant activity than parent chitosan. But in case of anticancer test of HebG2 and T24P chitosan was more effective than the modified derivatives.
Original Research Article
Ashwini Prasad; Gopalakrishna Bhat Nellikaya; Ronald Aquin Nazareth
Abstract
Determination of mercury in the existence of various other metal ions, a transparent speedy and accurate complexometric method is described, depending on the selective masking ability of L-Tyrosine towards Hg (II). Along with other associated metal ions, Hg (II) present in a given sample solution is ...
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Determination of mercury in the existence of various other metal ions, a transparent speedy and accurate complexometric method is described, depending on the selective masking ability of L-Tyrosine towards Hg (II). Along with other associated metal ions, Hg (II) present in a given sample solution is first complexed with an surplus of EDTA and the leftover EDTA is titrated with Zinc sulfate solution in the presence of xylenol orange as an indicator at pH 5.0-6.0.A known excess of 0.02M L-Tyrosine solution is then added to discharge the EDTA from Hg (II)-EDTA complex and then it is mixed well. The displaced EDTA is again titrated with a Zinc sulfate solution. The method goes well in the range 4-80 mg of mercury (II) with the relative error ±0.4 and standard deviation ≤0.05 mg. The issue of the existence of various metal ions on the exactitude of the results has been studied. And the method can be applied for the determination of Mercury in alloys, in its synthetic mixtures of ions and its complexes.
Original Research Article
Ozra Alimohammadi
Abstract
Environmental considerations have motivated the present study to develop and to investigate Cd (II) and Pb (II) removal process from aqueous solutions. This was carried out through the application of ultrasound onto sodium dodecyl sulfate coated palladium nanoparticles (SDSPdNPs). The recovered palladium ...
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Environmental considerations have motivated the present study to develop and to investigate Cd (II) and Pb (II) removal process from aqueous solutions. This was carried out through the application of ultrasound onto sodium dodecyl sulfate coated palladium nanoparticles (SDSPdNPs). The recovered palladium chloride of petroleum’s spent catalyst used as a precursor for the nanoparticle synthesis. The size, morphology and the structure of the synthesized adsorbent has been fully characterized using transmission electronic microscope (TEM), scanning electron microscope (SEM), and X-ray diffractometer (XRD) spectroscopy measurements. The mean diameter of the SDSPdNPs as typically 23.4 nm for a generally homogeneous size regardless of agglomeration is reported. Statistically designed experiments with the support of central composite design (CCP) and response surface methodology (RSM) were applied to evaluate the main physiochemical parameters that would affect the interactions among the variables with the aim to define optimization criteria for the adsorption efficiency with respect to both of the metal ions. The optimized condition is reported as follows: pH: 4.2; contact time: 92 min; adsorbent dosage: 65 mg. Further to the above findings, the experimental equilibrium data efficiency fitted the Langmuir model with a high adsorption capacity of 323.14 and 207.81 mg/g-1 in the case of Pb (II) and Cd (II), respectively.
Original Research Article
Mahmoud Ahmed Taher; Adel Mohamed Amine; Bassam Khalaf Damarany
Abstract
The present study conducted to investigate the potential use of PG in cement industry. This was accomplished by preparing mortar mixes contain Portland cement clinker (PPC) with thermally treated PG at different temperatures (200, 400, 600, 800 and 1000 °C) instead of raw gypsum (RG) at different ...
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The present study conducted to investigate the potential use of PG in cement industry. This was accomplished by preparing mortar mixes contain Portland cement clinker (PPC) with thermally treated PG at different temperatures (200, 400, 600, 800 and 1000 °C) instead of raw gypsum (RG) at different proportions. The characteristics of prepared mortars were investigated after curing in water for different periods (3, 7, 28 and 90 days) by determination of setting time, compressive strength, bulk density, and total porosity. The hydration kinetics was evaluated by determination of free lime and chemically combined water contents. FTIR spectroscopic analysis was used to investigate the change in structure of some mortars after curing. The change in morphology and microstructure of hardened pastes was investigated using scanning electron microscopy (SEM). The results approved the possibility for the utilization of treated PG at 800 and 1000 °C instead of raw gypsum in cement industry.
Original Research Article
Md Masud Rana; Subhash Chandra Chakraborty; Abu Saeid
Abstract
In this study, ten indigenous dried market fishes were selected to analyze the proximate composition, microbial analysis, and organoleptic properties. Proximate compositions were found to be varied among the species. Moisture content ranged from 15.66% to 35.50%, protein content ranged from 42.06% to ...
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In this study, ten indigenous dried market fishes were selected to analyze the proximate composition, microbial analysis, and organoleptic properties. Proximate compositions were found to be varied among the species. Moisture content ranged from 15.66% to 35.50%, protein content ranged from 42.06% to 65.78%, lipid content varied from 4.20% to 13.03% and ash content ranged of 5.28% to 18.60%. The results of TVB-N in different fish species ranged from 11.15 mg/100 g to 18.33 mg/100 g with highest in Puti (Puntius sophore) whereas lowest in Chanda (Chanda ranga) species. The bacterial load of dried fish species ranged from 3.13×107 to 3.67×108 (CFU/gm) with highest in Katchki (Corica soborna) and lowest in Puti (Puntius sophore). The sensory evaluation results revealed that Chapila (Gudusia chapra) is superior among the other dried fish species with color, flavor and appearance aspect. Overall, Chanda (Chanda ranga) was the better quality regarding all parameter among other dried fish species except protein content highest in Churi (Trichiurus lepturus) which was significantly different (P≤0.05) from Chanda (Chanda ranga) species.
Original Research Article
Megha Sharma; Anupam Jaiswal; Shalini Shivhare; Aditi Bapat; Deepak Kumar Jain
Abstract
The present study deals with the development and validation of two simple, accurate and precise spectrophotometricmethods for estimation of Aspirin (AS) and Omeprazole (OMP) in their binary mixture. The first method was developed using Vierordt’s simultaneous equation method. It involves absorbance ...
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The present study deals with the development and validation of two simple, accurate and precise spectrophotometricmethods for estimation of Aspirin (AS) and Omeprazole (OMP) in their binary mixture. The first method was developed using Vierordt’s simultaneous equation method. It involves absorbance measurement at 257 and 300 nm (λmax of AS and OMP) in methanol. Second method involves the formation of Q-absorbance equation using the respective absorptivity values at 284.5 nm (isoabsorptive point) and 300 nm (λmax of OMP). The drugs obey Beer’s Lambert’s law in the concentration range of 4-20 µg/mL and 2-10 µg/mL for AS and OMP respectively for both the methods. Limit of quantitation for Vierordt’s method for both the drugs was found to be 0.85 µg/mL, whereas for absorbance ratio method it was 0.68 and 0.88 µg/mL for AS and OMP respectively. % recovery for both the drugs was in the range of 99.78-100.31% indicating excellent accuracy for both the methods. The methods were precise, with a relative standard deviation of less than 1.25% for both drugs. The developed methods were validated according to ICH guidelines and values of accuracy, precision and other statistical analysis were found to be in good accordance with the prescribed values. Thus, both methods can be used for routine monitoring of drugs in industry for the assay of bulk drugs and commercial formulation (Yosprala).
Review Article
Sakineh Alizadeh; Zahra Nazari
Abstract
In recent years, nanoparticles have been classified in two-or three-categories namely nanocrystals, films and quantum dots. Due to the various properties shown by these composites, in comparison to individual particles, the studies that are related to the understanding and characterization of these materials ...
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In recent years, nanoparticles have been classified in two-or three-categories namely nanocrystals, films and quantum dots. Due to the various properties shown by these composites, in comparison to individual particles, the studies that are related to the understanding and characterization of these materials have gained much importance. nanoparticles are warming at room temperature to form metal colloids, in this stage, depending on the metal concentration i.e. metal type, organic solvent and delay time to stabilize the colloidal nanoparticles, the nanoparticles aggregation produce in different shapes (spherical, clusters, fractals, etc.),. The SMAD technique due to reducing and stabilizing metal nanoparticles in a polymer matrix at the time of synthesis, avoiding metal agglomeration and oxidizing of metal nanoparticles does not produce salt. There is great concentration on these compounds as they can be used in medicine as antibacterial coatings, due to the biocidal action of Au nanoparticles (AuNps). Undeniably, numerous selective homogeneous catalysts from nanoparticles have been reported but the only feature is the ability of the polymer chain to protect and stabilize the metal particles from oxidation, therefore, the penetration of the reagents for the desired catalytic reactions is possible.
Original Research Article
Dayo Latona
Abstract
The oxidation of propane-1,3-diol by potassium permanganate in aqueous solution was investigated at λmax 525 nm. The rate of the reaction was found to increase with increase in [KMnO4] and [Propane-1,3-diol]. The reaction showed first order dependence each in [KMnO4] and [Propane-1,3-diol] and ...
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The oxidation of propane-1,3-diol by potassium permanganate in aqueous solution was investigated at λmax 525 nm. The rate of the reaction was found to increase with increase in [KMnO4] and [Propane-1,3-diol]. The reaction showed first order dependence each in [KMnO4] and [Propane-1,3-diol] and independent in the ionic strength of the solution. The values of 〖∆H〗^#(kJ mol-1), 〖∆S〗^# (kJK-1mol-1) and〖 ∆G〗^#(kJmol-1) were 24.98, -0.22 and 90.50 respectively. Negative entropy of activation revealed an ordered transition state for the reaction. Spectroscopic studies and FTIR analysis revealed the product of the reaction to be 3-hydroxyl-propanal.
Original Research Article
Abolhasan Alavi; Farahnoosh Tahghighi Nia; Farshid Pajoom Shariati
Abstract
In this research, barley bran mixtures with sugar beet pulp were used for polygalacturonase enzyme production by Aspergillus niger fungus in solid state fermentation method for the first time. Effect of some factors including carbon sources relative composition, fermentation time, fermentation temperature, ...
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In this research, barley bran mixtures with sugar beet pulp were used for polygalacturonase enzyme production by Aspergillus niger fungus in solid state fermentation method for the first time. Effect of some factors including carbon sources relative composition, fermentation time, fermentation temperature, inoculation amount, and moisture content were investigated and optimized amounts were selected. Different mixtures of barley bran and sugar beet pulp with various relative compositions were studied and highest enzyme activity was found for 50% w/w of barley bran and sugar beet pulp. Incubation temperature of 30 °C, time duration of 7 days, moisture content of 80% w/w, and 10 million spores per gram of dry substrate were selected as optimum amounts.
Original Research Article
Kazi Mohammad Anamoul Haque; Mohd Nur E Alam Siddique; A. H. M. Shofiul Islam Molla Jamal; Md Anawarul Islam
Abstract
Geochemical study of toxic metal arsenic along with heavy metals (Fe. Mn and Cu), of borehole sediments of the Kushiara and Meghna, rivers in Bangladesh was conducted to investigate the mobilization, distribution and correlation of arsenic with depth, nature of sediment and locations of sampling site, ...
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Geochemical study of toxic metal arsenic along with heavy metals (Fe. Mn and Cu), of borehole sediments of the Kushiara and Meghna, rivers in Bangladesh was conducted to investigate the mobilization, distribution and correlation of arsenic with depth, nature of sediment and locations of sampling site, had been included to the study. The Kushiara is the upstream part of Meghna river. Sampling locations were carried out at Sherpur (Moulvibazar) and Beanibazar (Sylhet) for Kushiara river, which is one of the upper stream part of Meghna river. Samplings of borehole sediments collection have been done from Mohonpur (Chandpur) and Chandpur town (Chandpur) for the Meghna river. The borehole sediments were dried in the oven till constant weight and digested it nitric and perchloric acid (3:2) in fume cup hood in the laboratory. The digested sample were analyzed by Ag-DDTC UV visible Spectrophotmeter for arsenic also analysis of Fe. Mn and Cu in borehole sediment by Flame AAS. The average concentration of arsenic was found 6.39 mg/Kg in Borehole sediment for Kushiara river (Beanibazar and Sherpur), 5.00 mg/Kg for Meghna river (Mohonpur and Chandpur). The highest amount of arsenic (12.30 mg/Kg) was found in grayish clay type sediment at upstream of Kushiara river at Beanibazar. It is evident from the study, that arsenic is mobilized from upper stream to lower stream. In addition, it also reveals that high amount of Fe and Mn was in sediment sample. Statistical analysis shows that arsenic is strongly correlated with Mn and Fe but weakly correlated with Cu. In nature FeOOH occurs is yellowish in color and MnOOH is gray in color, these two of oxy-hydroxides may be scavengers of arsenic. It was indicated that the occurrence of FeSO4, MnSO4 and CuSO4 is predominant in all of the borehole sediment of Kushiara and Meghna rivers.
Original Research Article
Mahmoud E. Awad; Mohamed Nasser
Abstract
Thermal insulation layer in solid rocket motors is a vital component during the rocket flight. Many factors can affect the performance of this insulation layer. Bonding property between rocket propellant and the thermal insulation layer are examined in this study. Hydroxyl terminated polybutadiene (HTPB) ...
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Thermal insulation layer in solid rocket motors is a vital component during the rocket flight. Many factors can affect the performance of this insulation layer. Bonding property between rocket propellant and the thermal insulation layer are examined in this study. Hydroxyl terminated polybutadiene (HTPB) and isophorone diisocyanate (IPDI) as a curative was chosen as the most common type of rocket propellant. The effect of two types of polymeric insulation layer such as nitrile butadiene rubber (NBR) and ethylene-propylene-diene monomer (EPDM), on the bonding performance at the interface between (HTPB/IPDI) propellant and the respective insulation layer has been investigated. Results revealed that both types of insulation layer considerably decreased the interfacial bonding performance of the (HTPB/IPDI) propellant. NBR was proven to be more severe on weakening the adhesion strength than that of the EPDM. We further investigated the effects of the thickness and water content of NBR on the bonding performance, and proved that bonding strength was inversely proportional to the thickness and the water content.
Original Research Article
Keyur M. Pandya; Bhavesh P. Dave; Rajesh J. Patel; Piyush S. Desai
Abstract
In this research study, we have synthesized a library of 2-substituted-1-(2-(5-((5-5-benzoyl-1H-benzo[d][1,2,3]triazole-1-yl)methyl)-2-thioxo-1,3,4-oxadiazol-3(2H)-yl) acetamido)-5-oxo-2,5-dihydro-1H-pyrrole-3-carboxylic acids from 1H-benzo[d][1,2,3] triazole-5-yl)(phenyl)methanone. The synthesized compounds ...
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In this research study, we have synthesized a library of 2-substituted-1-(2-(5-((5-5-benzoyl-1H-benzo[d][1,2,3]triazole-1-yl)methyl)-2-thioxo-1,3,4-oxadiazol-3(2H)-yl) acetamido)-5-oxo-2,5-dihydro-1H-pyrrole-3-carboxylic acids from 1H-benzo[d][1,2,3] triazole-5-yl)(phenyl)methanone. The synthesized compounds were characterized using 1H NMR, 13C NMR, C,H,N elemental analysis and mass spectroscopy studies. All the compounds were investigated for their in silico ADME prediction properties, in vitro antibacterial activity against four bacterial strains, antifungal activity against two fungal strains, and antimycobacterial activity against the H37Rv. All the compounds revealed good to moderate activity against the bacterial strain. Among all the compounds, 6b and 6f showed better antimycobacterial agents compared with that of the standard drug ciprofloxacin and pyrazinamide, whereas 6a, 6b, and 6e were found to be excellent antifungal and antibacterial agent compared standard drugs clotrimazole and ciprofloxacin. The results of the in-silico analysis depicted that the synthesized compounds had excellent drug-likeness properties.
Original Research Article
Paul K. Baidoo
Abstract
Anthropological activities have contributed to high concentrations of greenhouse gases leading enormously to Global warming in the past decades. Such atmospheric changes are known to affect humans and ecological systems. One of the established anthropological activities to have increased greenhouse gasses ...
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Anthropological activities have contributed to high concentrations of greenhouse gases leading enormously to Global warming in the past decades. Such atmospheric changes are known to affect humans and ecological systems. One of the established anthropological activities to have increased greenhouse gasses is the depletion of vegetation cover which is a sink for CO2. In this study, remote sensing and geographical information systems were used to assess the effect of land use on vegetation cover and climate change over the last 20 years in greater Accra region of Ghana. Landsat images were stacked, rectified and classified into five land classes. Accuracy assessment of the classified images was assessed and change detection was determined. NDVI was used to validate vegetation change and variation in vegetation health over the study period. The study had an overall classification accuracy of 96.00%. Change detection statistics indicated that 12.07% and 22.92% vegetation cover increased, 25.84% and 13.98% vegetation cover decrease and 62.09% and 63.11% vegetation cover remained unchanged from 2002 to 2003 and 2003 to 2017 respectively. NDVI values from 2002 to 2017 ranged from 0.521127 to 0.506843 respectively indicating an 11.76% reduction in health of vegetation cover. The depletion and reduction in greenness of vegetation may have influence the high atmospheric CO2 concentration leading to 14 percent increase in temperature and periodic flooding of the study area over the last two decades.
Original Research Article
Mostafa Khajehzadeh; Sedigheh Rahmaniasl
Abstract
In this work, the complete structural, vibrational, electronic, and spectroscopic properties (1H, 13C NMR, UV–vis) and, natural bond orbital (NBO), Frontier molecular orbital (FMO) analysis of ethyl,1-methyl-4-phenylpiperidine-4-carboxylate (pethidine) and 2-(2-((2,6-dichlorophenyl)amino)phenyl)acetic ...
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In this work, the complete structural, vibrational, electronic, and spectroscopic properties (1H, 13C NMR, UV–vis) and, natural bond orbital (NBO), Frontier molecular orbital (FMO) analysis of ethyl,1-methyl-4-phenylpiperidine-4-carboxylate (pethidine) and 2-(2-((2,6-dichlorophenyl)amino)phenyl)acetic acid (diclofenac) drugs were investigated in the gas and liquid phases by using the density functional theory (DFT/B3PW91) method and DGDZVP level of theory. Moreover, CIS-DGDZVP was used to calculate the energy and wavelength absorption (λmax) of electronic transitions and its nature within the pethidine and diclofenac drugs. Therefore, for further analysis of these drugs, the effects of solvents on UV-vis and NMR spectra were investigated. The results revealed that the polarity of the solvents plays a crucial role in the structure and properties of the pethidine and diclofenac drugs. The 1H and 13C NMR spectra, NBO, the amount of global hardness, softness, ionization energy, electron affinity energy, the highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO), Frontier molecular orbitals analysis, hybridization, zero-point energy (ZPE), total energy (ET), Dipole Moment (m), polarizability (α), MEP, bond lengths, bond angles, and electro negativity were calculated in the gas and liquid phases. 3D-plots of the molecular electrostatic potential (MESP) for the studied compounds were investigated and analyzed to assess the distribution of electronic density of orbitals and nucleophilic sites of the selected molecules. The results of the spectra showed that the solvents had greater effects on pethidine. Nevertheless, as for CH3OH solvent, the zero-point energy equals to 0.344085, the total energy equal to 226.673 kcal/mol and dipole moment equal to 2.520 a.u were produced.
Original Research Article
Marzieh Miranzadeh; Fahime Afshari; Behnoosh Khataei; Mohammad Zaman Kassaee
Abstract
As (III) regularly requires oxidation to As (V), before it can be removed from water. Here, we reported photocatalytic removal of As (III) as well as adsorption of As (III) and As (V) using a novel, porous magnetic Ag/TiO2/Fe3O4@GO nanocomposite which was characterized via FT-IR, XRD, SEM, and TEM. A ...
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As (III) regularly requires oxidation to As (V), before it can be removed from water. Here, we reported photocatalytic removal of As (III) as well as adsorption of As (III) and As (V) using a novel, porous magnetic Ag/TiO2/Fe3O4@GO nanocomposite which was characterized via FT-IR, XRD, SEM, and TEM. A mathematical model (the central composite design) was used to estimate the relationship between the observed adsorption and our set of variables including initial concentration of arsenic ions, adsorbent dosage, pH, and the contact time. An optimum adsorption capacity of about 91% was observed for As (III) using 20 mg adsorbent with 24 ppm initial concentration of As (III), at pH = 5, within 90 min, and room temperature. Likewise, an optimum adsorption capacity of about 87% was observed for As (V) using 11 mg adsorbent with 17 ppm initial concentration of As (V), at pH = 3, within 30 min, and room temperature. The electrostatic factors between surface charge of nanocomposite and arsenic species were used to explain adsorption behavior of As (III) and As (V) at different conditions. The Langmuir isotherm equations best interpreted the nature of adsorption of As (III) and A (V). It was found during phocatalytic process maximum R% was about 63% for As (III) using 40 mg photocatalyst.
Original Research Article
Mohammad Sajjadnejad; Hooman Karimi Abadehb
Abstract
In this work, sol-gel process was chosen to produce a photocatalytic film to degrade methylene blue. To study the structural and morphological properties, a base sol of TTIP, I-PrOH, and DEA were created. Then, with addition of 45 g/L PEG 2000, 30 g/L TiO2, and 15 g/L PEG 2000+30 g/L TiO2, three other ...
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In this work, sol-gel process was chosen to produce a photocatalytic film to degrade methylene blue. To study the structural and morphological properties, a base sol of TTIP, I-PrOH, and DEA were created. Then, with addition of 45 g/L PEG 2000, 30 g/L TiO2, and 15 g/L PEG 2000+30 g/L TiO2, three other additional sols were produced. The results of the thermogravimetry and differntial thermal analysis indicated that a calcination temperature of 550 °C is sufficient to calcinate all four layers formed in four sols. Structural X-ray studies showed that, calcination temperature is dependent of the composition. The results of this study revealed that, substrate will have an effect on the photocatalytic behavior. It was concluded that the rough sand blasted surface because of creating more film islands that enhances photocatalytic behavior is a better substrate surface condition. Degradation of Mb showed that as a result of more TiO2 corporation in the film produced by the fourth sol, the fourth sol is superior in terms of photocatalytic behavior. Also it was found that, degradation of Mb is dependent on the initial concentration; and the higher initial concentration, the lower is the efficiency.
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