磷酸根对水稻土中重金属镉汞铅吸附特性的影响研究  

Effects of phosphate on adsorption properties of heavy metals Cd,Hg,Pb in paddy-soil

作　　者：周涛发[1,2] 陶春军[1,3] 李湘凌[1] 陈永宁[3] 陈兴仁[3] 贾十军[3] 袁峰[1] 陈富荣[3] 

机构地区：[1]合肥工业大学资源与环境工程学院,合肥230009 [2]中国地质大学地质过程与矿产资源国家重点实验室,武汉430074 [3]安徽省地质调查院,合肥230001

出　　处：《资源调查与环境》2009年第2期130-138,共9页Resources Survey & Environment

基　　金：中国地质调查局国土资源大调查项目(编号JH2005-3);安徽省优秀青年科技基金资助(编号:08040106907;04045063)

摘　　要：以合肥市郊的大兴镇和义城镇地区水稻土为主要研究对象,利用批量平衡法初步研究了重金属在两种土壤中的吸附热力学,据此分析研究水稻土对重金属的吸附性能及机理。在施磷情况下两种水稻土对三种重金属Cd,Hg,Pb吸附自由能均为负值,是常温常压下可以自发进行的过程,是物理和化学吸附并存的过程。两种水稻土对三种重金属Cd,Hg,Pb吸附过程均是熵增过程。Paddy-soils from two towns of the Hefei City, Anhui Province, were chosen to investigate the adsorption properties of heavy metals Cd, Hg, Pb under the influence of phos- phoric acid. Batch equilibration method was used in this experiment to study the adsorp- tion thermodynamics and isotherm of heavy metals in two typical soils. Adsorption ther- modynamics was further used to investigate the adsorption mechanisms of heavy metals. The Cd, Hg, Pb absorption Gibbs free energy of the two soils are all negative, which indi- cate that their related chemical processes can take place spontaneously, and also the chemical sorption coexists with the physical sorption. The absorption of Cd, Hg, and Pb by the two soils is governed by positive adsorption entropy processes.

关 键 词：水稻土 吸附 热力学 重金属 

分 类 号：X141[环境科学与工程—环境科学]