聚丙烯酸复合铝改性膨润土制备及其对Cr(VI)的吸附

doi:10.12034/j.issn.1009-606X.219141

摘要/Abstract

摘要： 为改善膨润土对Cr(VI)的吸附性能，用铝、丙烯酸聚合及十六烷基三甲基溴化铵改性合成聚丙烯酸复合铝改性膨润土。采用X射线衍射、红外光谱和扫描电子显微镜对天然膨润土和改性膨润土进行表征。结果表明，在25℃、溶液pH=5~6时，0.5 g吸附剂对200 mL浓度为20 mg/L Cr(VI)的平衡吸附量为1.996 mg/g，平衡吸附时间为130 min，且固液分离容易。吸附过程较好地符合Lagergren二级吸附动力学方程和Freundlich等温吸附方程，颗粒状吸附剂对Cr(VI)的吸附以络合吸附为主。

关键词: 丙烯酸, Cr(VI), 铝改性, 十六烷基三甲基溴化铵, 吸附

Abstract: The pollution caused by toxic metal ions on ecosystems, agriculture and human health has attracted worldwide attention. Cr(VI) has detrimental effects on livers, lungs, kidney and nervous systems of mammals. Thus, the removal of Cr(VI) ions from wastewater are very important. Cr(VI) occurs as CrO42?, HCrO4?, Cr2O72? and HCr2O7? in aqueous solution. The surface of natural bentonite is negatively charged and has a small adsorption capacity for anions. The natural bentonite is powdery and difficult to separate from treated aqueous solutions. To improve the adsorption performance and application performance of bentonite to Cr(VI), the polyacrylic acid aluminum modified bentonite composite was prepared according to the following steps. Bentonite was modified with aluminum chloride hexahydrate, the polyacrylic acid-modified bentonite was prepared by polymerization of acrylic acid with aluminum modified bentonite in aqueous solution, and the polymer product were modified with hexadecyl trimethyl ammonium bromide (CTMAB) in aqueous solution. The characteristics of natural bentonite and modified bentonite were determined by XRD, FT-IR and SEM. Batch adsorption of Cr(VI) onto modified montmorillonite was investigated. The results showed that aluminum, acid monomers and CTMAB had intercalated into bentonite interlayers, and did not destroy the basic structure of natural bentonite. The adsorption capacity of Cr(VI) was 1.996 mg/g for 200 mL initial concentration of 20 mg/L by 0.5 g adsorbent at 25℃. The adsorption process to Cr(VI) was corresponding with the Lagergren secondary adsorption kinetics equation, chemical adsorption was the main control step. The adsorption capacity of the adsorbent increased with increasing the initial concentration of Cr(VI). The equilibrium adsorption capacity of the adsorbent for different concentrations of Cr(VI) was corresponding with the Freundlich isotherm equation. The adsorption of Cr(VI) onto the composite bentonite was multimolecular layer adsorption. The adsorption of Cr(VI) by granular adsorbent was mainly complexation reaction adsorption.

Key words: acrylic acid, Cr(VI), aluminum modification, CTMAB, adsorption

王爽郭宏飞赵斌刘秀伍曹吉林. 聚丙烯酸复合铝改性膨润土制备及其对Cr(VI)的吸附[J]. 过程工程学报, 2020, 20(1): 44-51.

Shuang WANG Hongfei GUO Bin ZHAO Xiuwu LIU Jilin CAO. Synthesis of the polyacrylic acid aluminum modified bentonite composite and its adsorption of Cr(VI)[J]. Chin. J. Process Eng., 2020, 20(1): 44-51.

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