Study of Adsorption and Desorption of Behaviors of Pb2+ on Thiol-Modified Bentonite by Flame Atomic Absorption Spectrometry
CHEN Wen1,2, XIONG Qiong-xian1, PANG Xiao-feng2, ZHU Xia-ping1, HAN Mei1, ZHAO Qiu-xiang3, LIU Wen-hua3
1. College of Materials and Chemistry & Chemical Engineering, Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu University of Technology, Chengdu 610059, China 2. Institute of Life Sciences & Technology, University of Electronic Science & Technology of China, Chengdu 610054, China 3. Guangdong Province Material Testing Center, Guangzhou 510080, China
Abstract：A comparative analysis of the functional groups and surface structure of the Ca-bentonite (RB) and thiol-modified bentonite (TMB) were characterized by means of FTIR and SEM. The absorptive property of Pb2+ on TMB and RB and its influential factors was studied and the conditions for the adsorption were optimized by using FAAS method. Then the conditions for desorption of Pb2+ from the TMB by using simulated acid rain were studied and the contrast analysis of absorptive stability of Pb2+ on TMB and RB was given. The results showed that the adsorption rate of Pb2+ by TMB could reach more than 98%, when the initial Pb2+ concentration was 100 mg·L-1, the liquid-solid ratio was 5 g·L-1, pH was 6.0, KNO3 ionic strength was 0.1 mol·L-1 and adsorption period was 60min at 25 ℃. The saturated adsorption capacity of TMB was 67.27 mg·g-1; it’s much more than that of RB (9.667 mg·g-1). The adsorption of Pb2+ on TMB follows Langmuir and Freundlich isotherm models well. Desorption experiments of Pb2+ from TMB with simulated acid rain (pH 3.50) were done, and the desorption rate was 0. The results showed that TMB has a strong adsorption and fixation capacity for Pb2+; it is adapted to lead contaminated soil for chemical remediation.
Key words：Thiol-modified benfonite;Adsorption;Desoprtion;Lead ion
陈 文1，2，熊琼仙1，庞小峰2，朱霞萍1，韩 梅1，赵秋香3，刘文华3 . 原子吸收光谱法研究巯基改性膨润土对Pb2+的吸附解吸 [J]. 光谱学与光谱分析, 2013, 33(03): 817-821.
CHEN Wen1,2, XIONG Qiong-xian1, PANG Xiao-feng2, ZHU Xia-ping1, HAN Mei1, ZHAO Qiu-xiang3, LIU Wen-hua3 . Study of Adsorption and Desorption of Behaviors of Pb2+ on Thiol-Modified Bentonite by Flame Atomic Absorption Spectrometry. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(03): 817-821.
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