阳离子淀粉微球对Ni(Ⅱ)的吸附性能研究

Study on the Adsorption of Ni(Ⅱ) on Cationic Starch Microsphere

研究了阳离子淀粉微球对Ni(Ⅱ)的吸附行为,考查了时间、吸附剂用量及Ni(Ⅱ)初始浓度对吸附性能的影响,并探讨了Ni(Ⅱ)的吸附动力学。结果表明,吸附的最佳条件是吸附时间为3 h、吸附剂用量为0.3 g,Ni(Ⅱ)初始浓度为50 mg/L;分别采用两种动力学方程考察其吸附动力学,其结果和准二级模型计算结果之间有较好的相关性,说明了阳离子淀粉微球对Ni(Ⅱ)的吸附为化学吸附。

The adsorption behavior of Ni （Ⅱ） on cationic starch microspheres was studied, and influential factors were also dis- cussed such as pH, adsorption time, mass of cationic starch microspheres, and initial concentration of Ni （Ⅱ）. The kinetics was also explored. The results showed that the proper conditions for the removal of Ni（ Ⅱ ） were when the reaction time was 3 h, the dosage of cationic starch microspheres was 0. 3 g and the initial concentration of Ni （ Ⅱ ） was 50 mg/L. Two classical adsorption kinetic equations were respectively selected to describe the adsorption behaviors of cationic starch microspheres, nevertheless, the Ni（Ⅱ） adsorption agreed well with pseudo second-order adsorptive kinetics model, indicating that the adsorption behavior of Ni（Ⅱ） on cationic starch microspheres was chemisorption.