苯胺在典型土壤中的吸附、解吸附特性研究  

Adsorption and desorption characteristics of aniline by different typical soils

作　　者：袁进 李洋[2] 魏亮亮[2] 李超 张万昌[2] 赵庆良[2] 崔福义[2] 李瑞云 

机构地区：[1]山西省生态环境研究中心,太原030001 [2]哈尔滨工业大学市政环境工程学院城市水资源与水环境国家重点实验室,哈尔滨150090

出　　处：《黑龙江大学自然科学学报》2013年第6期794-801,共8页Journal of Natural Science of Heilongjiang University

基　　金：中国博士后科学基金特别资助项目(AUGA4131014313);中国博士后科学基金资助项目(AUGA4131010812)

摘　　要：采用平衡振荡法研究了苯胺在黄土、黏土和粉煤灰三种典型土壤中的吸附和解吸附规律。在5g·L-1土壤投加量下，黄土及黏土在30℃下对苯胺的吸附容量约为7—8mg·g-1，远高于粉煤灰吸附量（2．1～2．2mg·g-1），且低温使三种土壤样品对苯胺的吸附能力明显下降。黏土和黄土在中性条件下对苯胺的吸附量最高，但在酸性和碱性条件下吸附能力明显下降，在酸性条件下尤为明显，而粉煤灰对苯胺的吸附在pH=7条件下低于碱性及酸性条件。黄土、粉煤灰和黏土对苯胺的吸附均符合准二级动力学方程，其中黄土和黏土对苯胺的吸附满足Freundlich吸附等温式，而粉煤灰吸附更符合Langmuir方程。解吸附实验结果表明，吸附在黄土中的苯胺会在短时间内快速解吸附，而在黏土中需时较长，这与其具有较高的比表面积有关。In order to clarify the pollution mechanisms of aniline in soil, adsorption and desorption characteristics of aniline by three typical soil samples （loess, clay and fly ash） were studied via batch equilibrium experiments. Un- der the conditions of soil dosage of 5 g·L- 1 and temperature of 30℃, a 7 N 8 mg·g - 1 adsorptive capacity of ani- line was obtained for loess and clay adsorption, much higher than that of fly ash （2. 1 - 2.2 mg·g- 1 ）. The ad- sorption capacity of loess and clay was much higher at pH = 7 than that of acid and alkaline conditions. Contrarily, adsorption capacity of aniline by fly ash was the lowest at pH = 7 condition. Low temperature would lead to the decreasing adsorption ability of the three soil samples, especially for loess and clay. Adsorption of aniline by loess, clay and fly ash all followed the pseudo-second-order kinetic model, in which Freundlich model could well simulate the loess and clay adsorption of aniline, while Langmuir isotherm yielded a much better fit in simulating the adsorp- tion of fly ash. The adsorbed aniline on clay showed a lower desorption speed than that of loess, ascribed to its higher surface area.

关 键 词：苯胺 土壤 吸附 解吸附 动力学 

分 类 号：X703[环境科学与工程—环境工程]