污染控制技术及原理
宋艳宇,宋长春,柴俊海,郭军,赵全东,李刚.湿地土壤对硝基苯的吸附-解吸作用[J].环境科学学报,2009,29(1):140-145
湿地土壤对硝基苯的吸附-解吸作用
- Adsorption and desorption of nitrobenzene by wetland soils
- 基金项目:中国科学院重要方向性项目(No.KZCX2-YW-309);中国科学院东北地理与农业生态研究所前沿领域项目(No.KZCX3-SW-NA3-11)
- 宋艳宇
- 1. 中国科学院东北地理与农业生态研究所, 长春 130012; 2. 中国科学院研究生院, 北京 100049
- 宋长春
- 中国科学院东北地理与农业生态研究所, 长春 130012
- 摘要:应用平衡法研究硝基苯在湿地土壤中的吸附-解吸特性.结果表明,湿地土壤对硝基苯具有较强的吸附能力,其吸附行为可以用Linear和Freundlich型吸附等温式描述,不同类型湿地土壤对硝基苯的吸附和解吸能力有所不同.将吸附常数Kf与湿地土壤的理化性质进行相关性分析表明,土壤有机质含量与硝基苯吸附系数显著相关(r=0.888,p<0.01,n=7),其中泥炭沼泽土表层有机质含量最高,其吸附系数也最大(86.44 mg·kg-1).硝基苯在湿地土壤中的吸附自由能变化量为10.68~13.45 kJ·mol-1,表明其吸附以物理吸附为主.不同类型湿地土壤对硝基苯的解吸能力也有一定的差别,其中草甸白浆土的解吸率最大(41.87%),泥炭沼泽土表层解吸率最小(11.79%).
- Abstract:Adsorption and desorption characteristics of nitrobenzene by wetland soils were assessed with batch equilibrium experiments.The results showed that wetland soils have a strong adsorption capability for nitrobenzene.Adsorption isotherms were fitted to the linear and Freundlich models.Investigation into the physiochemical properties of soils and the adsorption coefficients(Kf) indicated that the Kf values and soil organic matter content were significant positively correlated(r=0.888,p<0.01,n=7).The top peat soils had the maximum adsorption coefficient(86.44 mg·kg-1) and the highest soil organic matter content.Adsorption free energy(ΔG) ranged from 10.68 to 13.45 kJ·mol-1,which showed that the adsorption was largely a result of physical adsorption.The meadow lessive soils had the maximum desorption rate(41.87%),and the desorption rate from peat soils was minimal(11.79%).
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