Controllable Synthesis of Mesoporous Alumina with Excellent Defluoridation Performance
XU Naicai1,2,3, HONG Tianzeng1,3, LIU Zhong1, ZHANG Xiangfei1,3, DONG Yaping1, LI Wu1
1 Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008; 2 Department of Chemistry, Qinghai Normal University, Xining 810008; 3 University of Chinese Academy of Science, Beijing 100049
Abstract: A series of mesoporous alumina with different crystalline types were successfully synthesized by using hydrothermal and high temperature roasting technologies, which employed sodium aluminate and aluminium chloride as the aluminum source, and glucose as the template agent. Structures, morphologies and textural properties of the products were characterized by XRD,SEM and BET, and defluoridation effects of the synthesized mesoporous alumina with different crystalline types were investigated by batch adsorption experiments. The experimental results showed that γ-Al2O3 prepared at 550 ℃ calcination temperature exhibited the excellent performance for fluoride removal. The adsorption isotherm was better described by the linear Langmuir model with a maximum adsorption capacity of 5.96 mg/g. The adsorption kinetics experiments indicated a high fluoride adsorption rate, as more than 90% fluoride ions were adsorbed within 5 minute. In addition, the adsorption kinetics was well fitted with linear pseudo-second-order mo-del, with a correlation coefficient value (R2) of 0.992 1. According to the results of the present study, the adsorption mechanism may involve ion exchange between F- and OH-.
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2017, Vol. 31 
