土壤对煤矸石填充时溶出重金属的吸附解吸动力学特征  

Adsorption and Desorption Kinetics Characteristics of Stripping Heavy Metals with Soil Filling in Coal Gangue

作　　者：欧睿[1] 邓寅生[1] 张新[2] 

机构地区：[1]河南理工大学资源环境学院,河南焦作454010 [2]平顶山工业职业技术学院资源开发系,河南平顶山467001

出　　处：《河南化工》2007年第7期14-16,共3页Henan Chemical Industry

基　　金：河南省重点科技攻关项目(0423032900)

摘　　要：研究了土壤对矸石填充时溶出重金属的吸附性能。通过一系列的试验表明:重金属Mn和As离子均符合Freund lich等温式,Mn和As的饱和吸附量分别为0.0083 mg/g和0.069μg/g;Mn和As的解吸过程都分为两个阶段,而不同离子的反应阶段时间不同;解吸动力学曲线的快速阶段对应于静电吸附态Mn和As解吸,慢速阶段主要对应于专性吸附态Mn和As的解吸。Mn和As的解吸率分别为2.55%和0.78%,而解吸因数分别为2.62×10-2和7.9×10-3。由此可知土壤对Mn和As的吸附稳定性都较高,土壤一旦吸附后就不易解吸。The adsorption characteristics of stripping heavy metals with soil filling in coal gangue are studied. Results of a series of experiments indicate that heavy metals, such as Mn and As ions, accord with Freundlich isotherm equation, the saturation adsorption capacity of Mn and As is 0. 0083 mg/g and 0. 069 μg/g, respectively. The desorption process of Mn and As can be divided into two stages and the reaction stage time of different ions is different. The fast stage of desorption dynamics curve corresponds to the electrostatic adsorption state of Mn and As desorption, while the slow stage mainly corresponds to the special adsorption state. The desorption rate of As and Mn is 2.55% and 0.78% , while desorption factor is 2.62 ×10^-2 and 7.9 ×10^-3 respectively. Therefore it indicates that the soil adsorption stability to Mn and As are all higher.

关 键 词：煤矸石 土壤 吸附 解吸 

分 类 号：TQ536.9[化学工程—煤化学工程]