中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Effect of Fe/Al oxides on desorption of Cd2+ from soils and minerals as related to diffuse layer overlapping

文献类型:期刊论文

作者Wang, Yan-ping1,2; Xu, Ren-kou1; Li, Jiu-yu1,2
刊名SOIL RESEARCH
出版日期2011
卷号49期号:3页码:231-237
关键词amorphous Al(OH)(3) amorphous Fe(OH)(3) crystalline Al(OH)(3) electrical double layer surface charge variable charge soil
ISSN号1838-675X
通讯作者Xu, Ren-kou(rkxu@issas.ac.cn)
英文摘要Cadmium is a toxic metal with high reactivity in acid variable charge soils. Adsorption and desorption of Cd2+ in soil and mineral particles can be affected by the interaction between the electrical double layers on oppositely charged particles, because the interaction can decrease the surface-charge density of the particles. We studied the effect of Fe/Al oxides on desorption of Cd2+ from soils and minerals and proposed the desorption mechanisms based on the overlapping of diffuse layers between negatively charged soils and mineral particles and positively charged Fe/Al oxide particles. Our results indicate that the overlapping of diffuse layers of electrical double layers between positively charged Fe/Al oxides [crystalline and amorphous Al(OH)(3) and amorphous Fe(OH)(3)] and negatively charged Ultisol, Alfisol, kaolinite, and bentonite caused the effective negative surface-charge density on the soils and minerals to become less negative, and thus the adsorption affinity of these negatively charged surfaces for Cd2+ declined as a result of the incorporation of the Fe/Al oxides. Consequently, the release of exchangeable Cd2+ from the surfaces of the soils and minerals increased with the amount of Fe/Al oxides added. The more positive the charge on the surfaces of the Fe/Al oxides, the stronger the interaction of the electrical double layers between the oxides and soils and minerals, and thus the greater the release of Cd2+ from the soils and minerals. A decrease in pH led to an increase in the positive surface charge on the Fe/Al oxides and enhancement of the interaction of the electrical double layers between the oxides and soils and minerals. As a result, more Cd2+ was desorbed from the soils and minerals. This study suggests that the interaction between oppositely charged particles of variable charge soils can enhance the mobility of cadmium in the soils and thus increase its environmental risk.
收录类别SCI
WOS关键词ELECTRICAL DOUBLE-LAYERS ; VARIABLE-CHARGE SOILS ; SURFACE-CHARGE ; IRON-OXIDE ; ADSORPTION ; SORPTION ; CADMIUM ; PARTICLES ; KINETICS ; SUSPENSIONS
WOS研究方向Agriculture
WOS类目Soil Science
语种英语
WOS记录号WOS:000290897500004
出版者CSIRO PUBLISHING
URI标识http://www.irgrid.ac.cn/handle/1471x/2559080
专题南京土壤研究所
通讯作者Xu, Ren-kou
作者单位1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714
Wang, Yan-ping,Xu, Ren-kou,Li, Jiu-yu. Effect of Fe/Al oxides on desorption of Cd2+ from soils and minerals as related to diffuse layer overlapping[J]. SOIL RESEARCH,2011,49(3):231-237.
APA Wang, Yan-ping,Xu, Ren-kou,&Li, Jiu-yu.(2011).Effect of Fe/Al oxides on desorption of Cd2+ from soils and minerals as related to diffuse layer overlapping.SOIL RESEARCH,49(3),231-237.
MLA Wang, Yan-ping,et al."Effect of Fe/Al oxides on desorption of Cd2+ from soils and minerals as related to diffuse layer overlapping".SOIL RESEARCH 49.3(2011):231-237.

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来源:南京土壤研究所

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