多孔炭/硅胶复合吸附剂的除铬(Ⅵ)吸附动力学研究

Adsorption Kinetics for the Removal of Chromium(Ⅵ) from Aqueous by Porous Charcoal/Silica Gel Composite Adsorbent

制备了多孔炭/硅胶复合吸附剂,研究了不同温度和初始浓度下除铬(Ⅵ)吸附动力学。结果表明吸附速率符合拟二级动力学方程,计算的拟二级动力学常数随着初始浓度的升高而降低。温度对吸附速率常数的影响较复杂,表明除铬(Ⅵ)过程并不是简单的吸附过程,而是伴随着铬(Ⅵ)的还原。

Porous charcoal/silica gel composite adsorbent was prepared. The adsorption kinetics for the chromium （ Ⅵ ） removal under various adsorption temperature and initial chromium（ Ⅵ ） concentration was studied. The results showed that the rates of adsorption was conformed to pseudo - second - order kinetics equation. The rate constants calculated decreased with increasing initial chromium（ Ⅵ ） concentration. The influence of temperature on adsorption was complicated, which indicated that the removal of chromium（ Ⅵ ） was not a simple adsorption mechanism. The removal process included the reducing of chromium（ Ⅵ ）.