粘土固化注浆帷幕对渗滤液中苯酚的吸附性能研究  

Adsorption of phenol in leachate on clay-solidified grouting curtain

作　　者：陈永贵[1,2,3] 张可能[3] 邓飞跃[4] 叶为民[1] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]长沙理工大学土木与建筑学院,湖南长沙410076 [3]中南大学地学与环境工程学院,湖南长沙410083 [4]中南大学化学化工学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2009年第1期243-247,共5页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(40802064;50678028);湖南省自然科学基金资助项目(07JJ4012);上海市博士后科研计划资助项目(08R214155)

摘　　要：采用醋酸铵反复作用法测得原粘土和粘土固化帷幕试样的阳离子交换容量,利用紫外分光光度仪测定溶液浓度,通过室内吸附平衡实验研究粘土固化注浆帷幕对渗滤液中苯酚的吸附性能。研究结果表明:在试验条件下,粘土固化注浆帷幕对苯酚的吸附量在2d后逐渐达到平衡,平衡吸附率为75.8%,拟合计算的最终平衡吸附率达到96%,表明粘土固化注浆帷幕对苯酚具有较强的吸附能力;粘土固化注浆帷幕对渗滤液中苯酚的吸附总体上符合Henry模型;而在苯酚浓度较高时,粘土固化注浆帷幕对苯酚的吸附较符合Langmuir模型,相关系数达0.96;粘土固化注浆帷幕对苯酚的吸附作用主要是由于存在电荷不平衡的较大内表面,其吸附能力与表面电荷密度、内部自由孔径以及有机物的特性等因素有关。Adsorption of phenol on clay-solidified grouting curtain was investigated by equilibrium experiments based on ammonium acetate to determine cation exchange capacity （CEC） and ultraviolet spectrophotometry to measure solution concentration. The results show that the adsorption reaction of phenol on clay-solidified grouting curtain reaches balance after 2 d in experimental conditions, the adsorption efficiency is 75.8% and the ultimately adsorption efficiency can reach 96% by using curve fitting, and the clay-solidified grouting curtain is an effective leachate retardarce agent with high adsorptive ability for organic contaminant. The adsorption mechanism of phenol on clay-solidified grouting curtain is generally well in accordance with Henry model, but it is better in accordance with Langmuir model with interrelated coefficient of 0.96 for high concentration of phenol. The adsorption capacity of phenol is closely related to specific surface area, surface charge density, internal freedom pore diameter and characteristics of organic matter.

关 键 词：苯酚 粘土固化注浆帷幕 渗滤液 填埋场 吸附 

分 类 号：X53[环境科学与工程—环境工程]