高铁酸钾对土壤中Cr(VI)吸附性能的影响

电镀、制革、采矿行业在作业过程中向环境中排放的铬给土壤造成了严重的污染,铬在环境中主要以三价和六价存在,而其中六价铬的毒性远远高于三价铬的毒性。在不同的Cr(VI)初始浓度、高铁酸钾投加量、震荡时间以及pH等条件下,研究高铁酸钾的加入对土壤中Cr(VI)去除效果及其对吸附行为的影响。实验结果表明：当高铁的投加量为400mg. kg_-1时、震荡时间为8h、pH为9-10时吸附效果达到最佳。绘制在不同的投加量下的吸附等温线,并用langmuir方程和Freundlich方程分别进行拟合,拟合的相关度比较好,结果显示随着投加量的增加,土壤的最大吸附量在增加,而且吸附能力越来越强。而吸附动力学满足二级动力学模型,表明吸附过程为多层吸附。此研究为铬污染土壤的修复和固定提供理论指导。

Effect of Potassium Ferrate on Adsorption of Cr (VI) in Soil

Electroplating, tanning, mining industry in the course of operations to the environment of chromium emissions to the soil caused serious pollution.Chromium in the environment mainly in the presence of trivalent and hexavalent, and the toxicity of hexavalent chromium is much higher than the toxicity of trivalent chromium.The effect of potassium ferrate addition on the removal of Cr (VI) in soil and its effect on the adsorption behavior was studied under different conditions of Cr (VI) initial concentration, potassium titanate dosage, shock time and pH.The experimental results show that when the dosage of high iron is 400mg.kg-1, the shock time is 8h and the pH is 9-10.The adsorption isotherms were plotted at different dosage and fitted, and fitted with the langmuir equation and the Freundlich equation respectively. The correlation of the fitting was better.The results showed that the maximum adsorption capacity of soil increased with the increase of dosage, and the adsorption capacity was increasing. While the adsorption kinetics satisfies the second - order kinetics model, indicating that the adsorption process is multilayer adsorption.This study provides theoretical guidance for the remediation and immobilization of chromium contaminated soil.