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Adsorption of nitrous oxide on the(6,0) magnesium oxide nanotube

Chinese Chemical Letters 2012年第11期23卷 1275-1278页

作者： Ali Ahmadi Peyghan Mohammad T.Baei saeedeh hashemian Masoumeh Moghimi Young Researchers Club Islamic Azad UniversityIslamshahr BranchTehranIran Department of Chemistry Azadshahr BranchIslamic Azad UniversityAzadshahrGolestanIran Department of Chemistry Yazd BranchIslamic Azad UniversityYazdIran Department of Chemistry Gonbad Kavoos BranchIslamic Azad UniversityGonbad KavoosGolestanIran

Nitrous oxide adsorption on the pristine （6,0） magnesium oxide nanotube was studied by using density functional theory calculations. We present the nature of the N2O interaction in selected sites of the nanotube. Adsorption energies corresponding to adsorption of the N2O on the nanotube were calculated to be in the range - 11.67 to -22.21 kJ mol- 1. Our results indicate that the N2O molecule has a weak physical adsorption on the pristine models due to weak Van der Waals interaction between the nanotubes and N2O molecule. The important results can be useful in production of the N2O sensors.

关键词： Magnesium oxide nanotube Adsorption N2O storage DFr

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Kinetics and thermodynamics of cyanide removal by ZnO@NiO nanocrystals

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Transactions of Nonferrous Metals Society of China 2017年第6期27卷 1394-1403页

作者： Mysam PIRMORADI saeedeh hashemian Mohammad Reza SHAYESTEH Department of Chemistry Islmic Azad University Yazd brunch Yazd Iran Department of Power and Electronic Factually of Engineering Islmic Azad University Yazd brunch Yazd Iran

ZnO,NiO and ZnO@NiO nanocrystals were successfully synthesized and characterized by FTIR,XRD and SEM *** average particles sizes of ZnO,NiO and ZnO@NiO were32,50and48nm,*** nanocrystals were examined assensors for cyanide *** cyanide sensing test revealed that,compared with the pure ZnO,NiO,the ZnO@NiO nanocrystalsexhibited highly improved sensing *** ZnO@NiO nano crystals were found to have better capacity for iron cyanidethan sodium *** effects of significant parameters such as contact time,pH(2-12),nanocrystal dose(0.02-0.4g)andcyanide concentration(5-50mg/L)on the removal of cyanide by nanocrystals were *** an optimum pH<5,over90%removal of20mg/L cyanide was obtained for nanocrystal dose of0.2g after30min contact time for iron cyanide by ZnO@NiOnano *** removal was followed by pseudo second order kinetic model for ZnO@NiO nano crystals(k2=4.66×10-2andR2=0.999).The values of standard entralpy change of7.87kJ/mol and standard free energy change of-18.62kJ/mol at298K suggestthe adsorption of cyanide on nanocrystals is an endothermic and spontaneous ***@NiO nanocrystal is an efficient sensorfor removal of cyanide from water and wastewater.

关键词： cyanide removal nano crystal adsorption ZnO@NiO

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Sb(Ⅴ) removal from copper electrorefining electrolyte: Comparative study by different sorbents

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Transactions of Nonferrous Metals Society of China 2017年第2期27卷 440-449页

作者： Katereh SALARI saeedeh hashemian Mohammad Taghi BAEI Department of Chemistry Islamic Azad UniversityYazd BrunchP.O.Box 89195-155YazdIran Department of Chemistry Islamic Azad UniversityAzadshahr BranchAzadshahrP.O.Box 49617-89985 GolestanIran

Removal of Sb（V） from copper electrolyte by different sorbents such as activated carbon, bentonite, kaolin, resin, zeolite and white sand was investigated. Adsorption capacity of Sb（V） removal from copper electrolyte was as follows： white sand 〈 anionic resin 〈 zeolite 〈 kaolin 〈 activated carbon 〈 bentonite. Bentonite was characterized using FTIR, XRF, XRD, SEM and BET methods. The results show specific surface area of 95 m2/g and particles size of 175 nm for bentonite. The optimum conditions for the maximum removal of Sb are contact time 10 min, 4 g bentonite and temperature of 40 ° C. The adsorption of Sb（V） on bentonite is followed by pseudo-second-order kinetic （R2=0.996 and k=9×10？5 g/（mg· min））. Thermodynamic results reveal that the adsorption of Sb（V） onto bentonite from copper electrolyte is endothermic and spontaneous process （ΔGΘ=？4806 kJ/（mol· K）. The adsorption data fit both the Freundlich and Langmuir isotherm models. Bentonite has the maximum adsorption capacity of 10000 mg/g for adsorption of Sb（V） in copper electrolyte. The adsorption of Zn, Co, Cu and Bi that present in the copper electrolyte is very low and insignificant.

关键词： antimony (V) bentonite copper electrolyte sorbent removal

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Kinetics and Thermodynamics of Adsorption Methylene Blue onto Tea Waste/CuFe<sub>2</sub>O<sub>4</sub>Composite

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American Journal of Analytical Chemistry 2013年第7期4卷 1-7页

作者： saeedeh hashemian Majeed Karimi Ardakani Hamila Salehifar Chemistry Department Islamic Azad University Yazd Branch Yazd Iran

Tea waste/CuFe2O4 (TW/C) composite was prepared by co-precipitation method. The TW and TW/C samples are characterized by FTIR, XRD, SEM and N2 physical adsorption. The results showed that specific surface area of 350 and 570 m2·g?1 for TW and TW/C, respectively. The average pore size of TW/C is ca. 100 nm. Adsorption of methylen blue onto TW/C composite has been studied. Measurements are performed at various contact time, pH and adsorbent dosage. The adsorption kinetics of methylen blue (MB) could be described by the pseudo-second order kinetic model. The adsorption isotherms are described by means of Langmuir and Freundlich isotherms. It was found that the Freundlich model fit better than the Langmuir model. The thermodynamic constants of the adsorption were calculated to predict the nature of adsorption. The values of thermodynamic parameters indicate that a spontaneous and endothermic process was occurred.

关键词： Adsorption CuFe2O4 Composite Kinetic Methylen Blue (MB) Tea Waste Thermodynamic

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Adsorption of Fe(III) from Aqueous Solution by Linde Type-A Zeolite

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American Journal of Analytical Chemistry 2013年第7期4卷 123-126页

作者： saeedeh hashemian Seyed Hossein Hosseini Hamila Salehifar Khaterah Salari Chemistry Department Islamic Azad University Yazd Branch Yazd Iran

Linde Type-A (LTA) zeolite was prepared from sodium aluminate and sodium metasilicate by hydrothermal process precursors. Sodium metasilicate prepared from molten NaOH and SiO2. The zeolite was characterized by FTIR, XRD, XRF and SEM. The adsorption of Fe(III) from aqueous solution by zeolite A was studied. Different parameters like contact time, pH and concentration of iron were investigated. The results show that at contact time of 60 min and pH of 6 maximum adsorption of iron onto zeolite was observed. The kinetic data was analyzed using pseudo-first-order and pseudo-second-order kinetic models. The adsorption kinetics of Fe(III) were fitted well with the pseudo-second-order kinetic model.

关键词： Adsorption LTA Zeolite Sodium Metasilicate Fe(III) Removal

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