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凹凸棒石及其改性材料对土壤镉生物有效性的影响与机制

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成果类型:
期刊论文
论文标题(英文):
Effect and Mechanism of Attapulgite and Its Modified Materials on Bioavailability of Cadmium in Soil
作者:
陈展祥;陈传胜;陈卫平;焦文涛
通讯作者:
Jiao, Wen-Tao(wtjiao@rcees.ac.cn)
作者机构:
[陈展祥; 陈传胜] College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha
410004, China
[陈卫平; 焦文涛] State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing
100085, China
[陈展祥] 410004, China<&wdkj&>State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing
语种:
中文
关键词:
凹凸棒石;土壤;钝化修复;络合吸附;硅羟基;羧基
关键词(英文):
Adsorption;Aluminum compounds;Biochemistry;Chlorine compounds;Complexation;Fourier transform infrared spectroscopy;Magnesium compounds;Remediation;Soils;X ray photoelectron spectroscopy;Attapulgites;Carboxyl groups;Cd-contaminated soils;Complexation reaction;Immobilization mechanisms;Modified materials;Saturated adsorption capacity;Silanol groups;Soil pollution;attapulgite;cadmium;magnesium derivative;silicon derivative;analysis;bioavailability;chemistry;lettuce;soil;soil pollutant;Biological Availability;Cadmium;Lettuce;Magnesium Compounds;Silicon Compounds;Soil;Soil Pollutants
期刊:
环境科学
ISSN:
0250-3301
年:
2018
卷:
39
期:
10
页码:
4744-4751
基金类别:
201506:中国科学院盱眙凹土中心项目 ZDRW-2016-5-5:中国科学院知识创新工程重要方向项目
机构署名:
本校为第一机构
院系归属:
环境科学与工程学院
摘要:
采用室内盆栽实验和吸附平衡实验,研究了凹凸棒石及其改性材料对土壤镉移动性和生菜吸收镉的影响,并通过X射线衍射( XRD) 、傅里叶变换红外光谱( FTIR)以及X射线光电子能谱( XPS)探讨了其机制.结果表明,凹凸棒石及其改性材料均可显著降低生菜体内的Cd含量,改性材料作用优于未改性材料,分别使生菜地上部分Cd含量最大降低41.0%和56.5%.凹凸棒石及其改性材料在投加量为1%时均可显著降低土壤CaCl_2提取态Cd含量,最大降低幅度分别为34.2%和34.3%.凹凸棒石改性后对镉的饱和吸附容量明显提高.凹凸棒石主要是通过表面的硅羟基与Cd~(2 +)发生配位反应形成络合物来固定土壤镉,而改性凹凸棒石材料能够通过其...
摘要(英文):
The effect of attapulgite (magnesium aluminium phyllosilicate) and its modified materials on the extractability of soil Cd and the accumulation of Cd in lettuce (Lactuca sativa) were investigated using a pot-culture experiment, and the immobilization mechanism of attapulgite and its modified materials was explored through X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The results showed that attapulgite and its modified materials could significantly reduce the Cd concentration...

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