木薯交联羧甲基淀粉对Cr^(3+)的吸附研究

Cr^(3+) Adsorption with Cassava Cross-linking Carboxymethylated Starch

采用搅拌球磨机对木薯淀粉进行机械活化,以活化60 min的木薯淀粉为原料合成交联羧甲基淀粉,考察交联羧甲基淀粉对Cr3+的静态吸附行为和动力学性质,并对吸附机理进行了探讨。结果表明,交联羧甲基淀粉对Cr3+有很好的吸附作用,在常温、吸附时间60 min、Cr3+浓度0.06 mg/mL、pH 3.3条件下,交联羧甲基淀粉对Cr3+的吸附容量为15.3 mg/g。吸附受颗粒内扩散控制,其过程符合Freundlich等温方程。吸附机理推测是物理吸附和化学吸附的综合作用。

The cross-linking carboxymethyl starch was prepared using the cassava starch mechanically activated for 60 min by a ball-stirring mill. The static adsorption behavior and kinetics of the cross-linking carboxymethyl starch on Cr3＋ were investigated. The adsorption mechanism was studied. The results showed that the cross-linking carboxymethyl starch could adsorb Cr3＋ with 15.3 mg/g when the dosage of cross-linking carboxymethyl starch was 0.10 g, Cr3＋ initial concentration was 0.06 mg/mL with pH of 3.3 and the adsorption time of 60 min. The adsorption was an intraparticle diffusion process. The adsorption process was adapted to Freundlich equation. The adsorption was comprehensive action of physical adsorption and chemical adsorption.