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Arash Almasian,Niyaz Mohammad Mahmoodi,Mohammad Ebrahim Olya 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-
The surface of polyacrylonitrile (PAN) nanofiber was modified by Tectomer and its dye removal abilityfrom binary systems was studied. The characteristics of nanofibers were investigated by FTIR, AFM, SEM,BET and BJH methods. FTIR showed successful grafting of Tectomer to the surface through the formationof imine group. Decrease in the average roughness and total surface area of nanofiber were detected byAFM and BET analysis, respectively. The adsorption capacity of Tectomer grafted nanofiber for Direct Red80 and Direct Red 23 was 1250 and 1111 mg/g, respectively. Adsorption of dyes follows the Langmuirisotherm and pseudo-second order kinetics.
Kalal, Hossein Sid,Khanchi, Ali Reza,Nejatlabbaf, Mojtaba,Almasian, Mohammad Reza,Saberyan, Kamal,Taghiof, Mohammad Techno-Press 2017 Advances in environmental research Vol.6 No.4
An Amberlite XAD-4 resin impregnated with di(2-ethylhexyl)phosphoric acid was prepared and its adsorption-desorption behaviors with Sr(II) ions under various conditions was examined. The resin was characterized by fourier transform infrared and thermal analysis techniques. The effects contact time, temperature, pH, interfering ions and eluants were studied. Results showed that adsorption of Sr (II) well fitted with pseudo-second-order kinetic model. The equilibrium adsorption data of Sr (II) on the impregnated resin were analyzed by Jossens, Weber-van Vliet, Redlich-Peterson and Fritz-Schlunder models to find out desirable equilibrium condition. Among them, the Fritz-Schlunder model best fitted to the experimental data. The maximum sorption capacity of impregnated resin amounted to 0.45 mg/ g at pH 8.0 and $20^{\circ}C$.
Anoushiravan Mohseni Bandpei,Seyed Mohsen Mohseni,Amir Sheikhmohammadi,Mahdieh Sardar,Maryam Sarkhosh,Mohammad Almasian,Moayad Avazpour,Zahra Mosallanejad,Zahra Atafar,Shahram Nazari,SoheilaRezaei 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.2
Arsenic is a critical contaminant for aqueous environments as it poses harmful health risks. To meet the stringent regulations regarding the presence of arsenic in aqueous solutions, the feasibility of montmorillonite clay modified with hexadecyltrimethyl ammonium chloride as the adsorbent was tested for the removal of arsenic ions from aqueous solutions. A scanning electron microscopy (SEM) study confirmed that the organically modified nanoclay (ONC) adsorbent had a porous structure with a vast adsorbent surface. The x-ray fluorescence (XRF) analysis proved the presence of carbon in the structure of the modified nanoclay that can be evidence for the creation of ONC. The x-ray diffraction (XRD) analysis results confirm the existence of four main groups of minerals, carbonate (Calcite), clay (Askmtyt and Kandyt), silicate (Quartz), and phyllosilicate (Kaolinite), in the ONC structure.The influence of various parameters such as solution pH, adsorbent dosage, initial arsenite concentration, and contact time on arsenic adsorption onto ONC was investigated. A 25 full factorial central composite experimental design was applied. A central composite design under response surface methodology (RSM) was employed to investigate the effects of independent variables on arsenite removal and to determine the optimum condition. The experimental values were in a good fit with the ones predicted by the model. The optimal operating points (adsorbent dosage: 3.7 g L−1, surfactant dosage: 3 g L−1 and the contact time: 37.2min) giving maximum arsenite removal (95.95%) were found using Solver “Add-ins” in Microsoft Excel 2010.