含水层介质对Cr(VI)的吸附特征  

Adsorption characteristics of Cr( VI) in aquifer media

作　　者：李银[1] 刘瑜[1] 李昌乐 

机构地区：[1]天津市水利科学研究院,天津300061 [2]辽宁省本溪市征地服务处,本溪117000

出　　处：《环境工程学报》2016年第4期2071-2076,共6页Chinese Journal of Environmental Engineering

基　　金：天津市水务局科技计划项目(KY2014-03)

摘　　要：结合天津典型地质和Cr(VI)污染情况,选择细砂、中砂、粗砂这3种含水层介质作为研究对象,研究其对Cr(VI)的吸附动力学实验和等温吸附实验。研究结果表明:3种含水层介质对Cr(VI)的吸附均包括2个阶段——快速吸附阶段和缓慢吸附阶段,并在2 h时达到吸附平衡,符合Elovich型吸附动力学。含水层介质对Cr(VI)的等温吸附模型符合Freundlich模型,表明吸附过程以不均匀吸附为主。含水层介质对Cr(VI)的吸附能力由大到小的顺序依次为细砂、中砂、粗砂;且当Cr(VI)溶液的初始浓度为0.1 mg/L,含水层介质为10 g细砂时,达到最大吸附率22.67%,吸附率很低,表明这3种含水层介质不易吸附Cr(VI),也就说明Cr(VI)进入地下水后不易被含水层介质吸附截留,而是在地下水中随之流动,造成远距离污染。Based on the typical geology and the pollution of Cr（ VI） in Tianjin,three aquifer mediums of fine sand,medium sand,and coarse sand were chosen as research materials to study their adsorption kinetics and isothermal adsorption of Cr（ VI）. The results showed that the adsorptions of the three aquifer mediums to Cr（ VI）included fast and slow adsorption stages. Adsorption equilibrium was achieved after 2 h and conformed to Elovich adsorption kinetics. The adsorption isothermal model of the aquifer mediums to Cr（ VI） obeyed the Freundlich model,which indicated that the adsorption process was mainly uneven. The adsorption capacity of fine sand to Cr（ VI） was the highest. However,when the initial concentration of Cr（ VI） solution was 0. 1 mg / L and the aquifer medium was 10 g of fine sand,the maximum adsorption rate was only 22. 67%,which showed that it was difficult for the three aquifer mediums to adsorb Cr（ VI）. This means that Cr（ VI） can be intercepted by an aquifer medium after it has entered the groundwater,but flows in the groundwater can cause long distance pollution.

关 键 词：含水层介质 CR(VI) 吸附动力学 等温吸附 地下水 

分 类 号：X523[环境科学与工程—环境工程]