竹炭对水溶液中Cr(Ⅵ)的吸附特性及动力学研究

Study on adsorption characteristic and kinetics of bamboo charcoal on Cr(Ⅵ) in aqueous solution

研究了竹炭对水溶液中的Cr(Ⅵ)的吸附特性,探讨pH值、吸附时间、初始浓度等对Cr(Ⅵ)吸附效果的影响,以及竹炭吸附Cr(Ⅵ)的动力学特性。结果表明:酸性条件下,pH值越小、吸附时间越长、初始浓度越低,吸附效果越好;竹炭对Cr(Ⅵ)的等温吸附可以用Langmuir吸附等温线来描述,相关系数达0.9973;吸附动力学规律可以用二级动力学方程描述,相关系数在0.99以上。

The adsorption characteristic of bamboo charcoal on Cr（ Ⅵ ） in aqueous solution was studied; the influences of pH value, adsorption time, initial concentration and some other factors on the adsorption effect as well as the kinetic properties thereof were discussed. The results showed that, in the acid solution, lower the pH value, longer the contact time, lower the initial concentration, better the adsorption rate of Cr（ Ⅵ ） could be. The adsorption behavior of bamboo-charcoal on Cr（ Ⅵ ） could be described by Langmuir equation with coefficient of 0.997 3. The adsorption kinetics followed pseudo-second-order kinetic model with coefficient over 0.99.