摘要
利用硅藻土负载羟基氧化铁颗粒作吸附剂对六价铬进行吸附和解吸附实验,探讨了硅藻土负载羟基氧化铁对六价铬的吸附机制和固体浓度效应。实验结果表明:在实验条件下,当吸附剂的用量从0.05 g增加到0.2 g时,六价铬的吸附量从23 940.124μg/g降低到8 575.415μg/g,吸附剂对Cr6+的吸附存在明显的固体浓度(C s)效应。吸附滞后角随着C s的增加而减小,吸附反应的可逆性增大。将实验数据分别用Languir和Freundlich吸附模型进行拟合,发现Freundlich吸附模型对实验数据拟合效果较好,表明该吸附反应以单分子层吸附为主。
Taking diatomite which loaded the hydroxyl iron oxide（ FeOOH） particles as adsorbent, the paper makes a research on the mechanism of hexavalent chromium adsorption and desorption. The research tries to reveal adsorption mechanism and solid concentration effect. The result shows that the adsorbing capacity of hexavalent chromium decreases from 23940. 124μg/g to 8575. 415μg/g when the adsorbent increases from 0. 05g to 0. 2g, which indicates that adsorbent has significant soild concentration effect on hexavalent chromiunm＆#39;s adsorption. Moreover, with the increase of Cs, adsorption hysteresis angle reduces, and the reversibility of the adsorption reaction increases. Matching research data to Languir adsorption model and Freundlich adsorption model respec-tively, the paper finds that matching result of the latter one is more reasonable, which indicates that adsorption in this research is mainly acted as monolayer adsorption.
出处
《地下水》
2014年第1期95-97,共3页
Ground water
关键词
六价铬
硅藻土负载羟基氧化铁
吸附
解吸附
固体浓度效应
Hexavalent chromium
diatomite loaded with the FeOOH
adsorption
desorption
solid concentration effect
