화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.34, No.2, 376-383, February, 2017
DOI10.1007/s11814-016-0287-z  Export Citation
Optimization of arsenite removal by adsorption onto organically modified montmorillonite clay: Experimental & theoretical approaches
Anoushiravan Mohseni Bandpei, Seyed Mohsen Mohseni1, Amir Sheikhmohammadi2, †, Mahdieh Sardar, Maryam Sarkhosh3, Mohammad Almasian4, Moayad Avazpour5, Zahra Mosallanejad6, Zahra Atafar7, Shahram Nazari8, and SoheilaRezaei9
  • Department of Environmental Health Engineering, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  • 1**Department of Environmental Health Engineering, School of Public Health, Qom University of Medical Sciences, Qom, Iran
  • 2Students Research Office, Department of Environmental Health Engineering, School of Public Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  • 3Department of Environmental Health Engineering, School of Public Health, Mashhad University of Medical Sciences, Mashhad, Iran
  • 4School of Medicine, Lorestan University of Medical Sciences, Khorramabad, Iran
  • 5Department of Environmental Health Engineering, School of Public Health, Ilam University of Medical Science, Ilam, Iran
  • 6Food and Cosmetic Health Research Center, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
  • 7Research Center for Environmental Determinants of Health (RCEDH), Kermanshah University of Medical Sciences, Kermanshah, Iran
  • 8Department of Environmental Health Engineering, School of Public Health, Ardabil University of Medical Sciences, Ardabil, Iran
  • 9Social Determinants of Health Research Center, Yasuj University of Medical Sciences, Yasuj, Iran
E-mail:
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.
Keywords:Modeling;Response Surface Methodology;Organic Nanoclay;Arsenite;Optimization
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