壳聚糖接枝聚丙烯酸/蛭石复合物对铜离子(Ⅱ)的吸附研究

Adsorption behaviors of copper ion (Ⅱ) on chitosan-g-poly (acrylic acid)/vermiculite composites

摘要: 用壳聚糖接枝聚丙烯酸/蛭石复合物作为铜离子(Ⅱ)吸附剂,研究了溶液初始pH值、蛭石在复合物中的质量百分含量、吸附时间,以及溶液初始浓度对复合物样品吸附效果的影响。结果表明,复合物对铜离子的吸附量随着蛭石含量的增加而减小,但复合物中蛭石的含量达到30%时,对铜离子(Ⅱ)的吸附量仍超过220 mg/g。吸附行为均符合准二级吸附动力学模型和Langmuir吸附等温线模型。

Abstract: Batch of adsorption experiments were carried out to remove Cu(Ⅱ) from its aqueous solution using chitosan-g-poly(acrylic acid)/vermiculite (CTS-g-PAA/UVMT) as adsorbents. The factors influencing adsorpion capacity of composites such as initial pH value of the Cu(Ⅱ) solution, the vermiculite content, adsorption time and the initial concentration of the Cu(Ⅱ) solution were investigated. The results showed that the adsorption capacity of CTS-g-PAA/UVMT composites decreases with the increase of the vermiculite content, but the adsorption capacity of samples with 30% the vermiculite content exceeds 220 mg/g. The adsorption behaviors of composites showed that the adsorption kinetics and isotherms are in good agreement with pesudo-second–order equation and the Langmuir equation, respectively.