硝基苯在不同类型土壤中的吸附特性研究  

Adsorption characteristics of nitrobenzene in different type soils

作　　者：张营[1,2] 刘思惠[1] 景逵[1] 刘冰 

机构地区：[1]辽宁大学环境学院,辽宁沈阳110036 [2]湖南农业大学资源环境学院,湖南长沙410128 [3]辽宁省环境科学研究院,辽宁沈阳110161

出　　处：《广东农业科学》2013年第4期137-139,共3页Guangdong Agricultural Sciences

基　　金：国家自然科学基金(41071317);辽宁省自然科学基金(20092013);沈阳市科技计划项目(F10-205-1-64);辽宁大学"211"工程第三期重点学科项目(HJ211001);辽宁大学青年基金(2012)

摘　　要：为全面评价硝基苯的环境行为,应用平衡法探究硝基苯在不同类型土壤中的吸附特性,以期为硝基苯的污染控制与防治修复提供理论依据。结果表明:供试红壤和草甸棕壤对硝基苯的吸附均经历了快速吸附、减速吸附和平衡吸附3个阶段,其吸附行为可用Langmuir和Freundlich型吸附等温式描述(P<0.05)。不同类型土壤对硝基苯的吸附能力不同,Freundlich模型中红壤的吸附系数K小于草甸棕壤,表明红壤对硝基苯的吸附能力弱于棕壤。对两种有机质含量分别为16.33、11.15 g/kg的草甸棕壤进行吸附试验,采用Langmuir型等温吸附曲线拟和,确定硝基苯饱和吸附量分别为200、142μg/g,表明随土壤有机质含量的增加,土壤对硝基苯的吸附能力增大,有利于硝基苯活性和毒性的降低。Adsorption characteristics of nitrobenzene in different type soils were assessed with batch equilibrium experiments in order to evaluate the environmental behaviors and provide foundation for pollution control by nitrobenzene. The results showed that the adsorption can be divided roughly into three phases, namely, high-speed adsorption, deceleration adsorption and balance adsorption. Adsorption isotherms were fitted to the Langmuir and Freundlich models （P〈0.05）. Investigation into the physiochemical properties of soils and the adsorption coefficients （K） indicated that the adsorption ability of red soil was lower than that of brown soil. According to Langmuir isotherm adsorption equation, the saturated adsorption capacities of brown soil with different contents of organic matter （16.33 g/kg and 11.15 g/kg） were 200 μg/g and 142 μg/g, respectively. The adsorption ability of soil to nitrobenzene augments with increasing contents of organic matter, which may help to reduce the activity and toxicity of nitrobenzene in soils.

关 键 词：硝基苯 土壤 吸附 红壤 棕壤 

分 类 号：X53[环境科学与工程—环境工程]