Synthesis of the poly(acrylic acid-acrylic sodium) bentonite composite and its adsorption of Cd(II)

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• 作者：Xinling You ; Jilin Cao ; Xiuwu Liu ; Jingzhao Lu and Xueqing Chen
• 刊名：Asia-Pacific Journal of Chemical Engineering
• 出版年：2017
• 出版时间：January/February 2017
• 年：2017
• 卷：12
• 期：1
• 页码：65-74
• 全文大小：1374K
• ISSN：1932-2143

文摘

In order to improve the adsorptive properties of bentonite, a new poly(acrylic acid-acrylic sodium) bentonite composite was prepared by copolymerization reaction. The properties of the bentonite composites were investigated. Based on the amount of acrylic monomers dissolution and Cd²⁺ ions adsorption as objective functions, the optimal conditions which were determined with single-factor experiments are as follows: the neutralization degree of acrylic acid, the polymerization temperature, the polymerization time, and the mass ratio of bentonite to acrylic acid monomer unneutralized were 20%, 80 °C, 3 h and 8 : 2, respectively. The bentonite composite was characterized by XRD, IR, and SEM. It was indicated the basic structure of bentonite had not been destroyed when the monomers were intercalated into the bentonite interlayers. The synthetic products had excellent adsorption properties to Cd²⁺ ions, such as the removal rate of Cd²⁺ ions reached 99.9% for 100 mL solution with initial Cd²⁺ ions concentration of 50.0 mg/L by adding 0.5 g sample of the bentonite composite, whose removal rate was significantly superior to calcium bentonite and other modified bentonite reported in literatures. The adsorption process to Cd²⁺ ions was corresponding with the Lagergren secondary adsorption kinetics equation and the Langmuir isotherm equation.