Synthesis and characterization of Fe-MCM-41 from rice husk silica by hydrothermal technique for arsenate adsorption |
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| Authors: | Kitirote Wantala Suthipong Sthiannopkao Bang-orn Srinameb Nurak Grisdanurak Kyoung Woong Kim |
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| Institution: | (1) Department of Chemical Engineering, Faculty of Engineering, Thammasat University, Pathumthani, 10120, Thailand;(2) International Environmental Research Center (IERC), Gwangju Institute of Science and Technology (GIST), 261 Cheomdan-gwagiro, Buk-gu, Gwangju, 500-712, Republic of Korea;(3) National Center of Excellence for Environmental and Hazardous Waste Management: Faculty of Engineering, Thammasat University, Pathumthani, 12120, Thailand;(4) Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 500-712, Republic of Korea; |
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| Abstract: | Rice husk (RH) agro-waste was used as a raw material for synthesizing mesoporous molecular sieves, MCM-41. The Fe-MCM-41 was
prepared by the hydrothermal technique (HT), resulting in a higher surface area and crystallinity than when prepared under
ambient conditions. In addition, a hexagonal structure was clearly seen with hydrothermal technique (HT) preparation. The
adsorption of arsenate by HT-Fe-MCM-41 was investigated. The factors studied affecting arsenate adsorption capacity were ferric
content in MCM-41, contact time, pH of solution, and initial arsenate concentration. It was found that HT-Fe-MCM-41 at the
Si/Fe mole ratio of 10 gave the highest adsorption capacity. Arsenate adsorption reached equilibrium within 4 h. The adsorption
capacity of HT-Fe-MCM-41 (Si/Fe = 10) was affected by the initial pH value and the initial arsenate concentration. The adsorption
capacity was highest at pH 3 and decreased thereafter with increases in the pH of solution value. The Langmuir model fit the
arsenate adsorption isotherm well. The maximum adsorption capacity for arsenate was 1,111 μg g−1. |
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