作者机构：
[朱健; 王平; 雷明婧; 张伟丽; 陈仰] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China
通讯机构：
College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha, China
作者机构：
[朱健; 王平; 林艳; 雷明婧; 陈仰] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;[朱健; 王平; 林艳; 雷明婧; 陈仰] 410004, China
关键词：
硅藻土;产地;土壤Cd污染;原位固定;有效态
摘要：
为了了解不同产地硅藻土对土壤 Cd 污染固定效应及机制的差异,选择了云南腾冲、吉林临江、浙江嵊州和河南信阳这4地的硅藻土作为改良剂,对人工模拟 Cd 污染土壤进行原位固定修复试验.结果表明,不同产地硅藻土均能有效固定土壤中的 Cd,当添加浓度为30 g?kg -1时,上述 4地硅藻土分别使土壤有效态 Cd 含量下降了27.7％、28.5％、30.1％、57.2％；不同产地硅藻土对土壤 Cd 污染固定能力排序为：河南信阳>浙江嵊州>吉林临江>云南腾冲；不同产地硅藻土自身理化特征对土壤 Cd 的固定起主要作用,硅藻土堆密度越小,比表面积越大,微孔数量越多,孔径分布范围越广,越有利于土壤有效态 Cd的固定；不同产地硅藻土可以通过调节土壤理化性质来控制土壤 Cd 污染,土壤 pH 值和有机质是关键调控因素,提高 pH 值和增加有机质能有效促进有效态 Cd 的固定,调控土壤含水率对 Cd 的固定效果影响不大,而通过调控土壤 CEC 来控制土壤Cd 污染存在一定时效性；河南信阳、浙江嵊州、云南腾冲硅藻土均使土壤 pH 值上升,有机质增多,有利于土壤 Cd 的固定,而吉林临江硅藻土则反之.
作者机构：
[朱健; 雷明婧; 王平; 张伟丽; 陈仰] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha;410004, China;[朱健; 雷明婧; 王平; 张伟丽; 陈仰] 410004, China
作者机构：
[雷明婧] Institute of Environmental Science and Engineering Research, Central South University of Forestry and Technology, Changsha 410004, China;National Engineering Laboratory for Applied Technology of Forestry and Ecology in South China, Changsha 410004, China;[李捍东] Chinese Research Academy of Environmental Sciences, Beijing 100012, China;[朱健; 王平] Institute of Environmental Science and Engineering Research, Central South University of Forestry and Technology, Changsha 410004, China, National Engineering Laboratory for Applied Technology of Forestry and Ecology in South China, Changsha 410004, China
通讯机构：
[Wang, P.] I;Institute of Environmental Science and Engineering Research, Central South University of Forestry and Technology, Changsha 410004, China
通讯机构：
[Wang, Ping] C;Cent South Univ Forestry & Technol, Inst Environm Sci & Engn, Shaoshan South Rd, Changsha 410004, Hunan, Peoples R China.
摘要：
A readily available effective adsorbent is necessary to adsorb heavy-metal ions from aqueous solutions. In this study, a novel adsorbent with good adsorption properties [Al3+-oligomer-pillared diatomite (Al 3+-oligomer-PD)] was prepared and was used to adsorb Cd2+ ions in a solid/liquid system. The property and nature of the Cd2+ ions adsorbed on the surface of the Al3+-oligomer-PD were studied by performing a series of adsorption tests and related surface property analyses. Our study results show that owing to a more favourable pore structure, the PD has a higher adsorption property compared with natural diatomite (ND) and most other common adsorbents. The adsorption capacity of PD is 27.36% greater than ND and also achieves an optimal value of 10.05 mg/l. Certain parameters have a significant effect on Cd2+ ion adsorption. The most suitable isotherm and kinetics models for describing the adsorption of Cd2+ ions are the Freundlich and pseudo-second-order models. The nature of Cd2+ ion adsorption on PD is favourable, physical, spontaneous, exothermic and disorder increasing. The results of the study suggest that PD is an ideal adsorbent for the removal of cadmium ions from aqueous solutions.
作者机构：
Institute of Environmental Science and Engineering Research, Central South University of Forestry and Technology, Changsha 410004, China. zhujian198312@163.com;[吴庆定] Institute of Processing Technologies of Materials, Central South University of Forestry and Technology, Changsha 410004, China;[王平; 李科林; 雷明婧; 张伟丽] Institute of Environmental Science and Engineering Research, Central South University of Forestry and Technology, Changsha 410004, China;[朱健] Institute of Environmental Science and Engineering Research, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Institute of Processing Technologies of Materials, Central South University of Forestry and Technology, Changsha 410004, China
会议名称：
Global Conference on Civil, Structural and Environmental Engineering / 3rd International Symp on Multi-field Coupling Theory of Rock and Soil Media and its Applications
会议时间：
OCT 20-21, 2012
会议地点：
China Three Gorges Univ, Yichang, PEOPLES R CHINA
