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Adsorption isotherm, mechanism, and geometry of Pb(II) on magnetites substituted with transition metals
Xiaoliang Liang;  Gaoling Wei;  Juan Xiong;  Fuding Tan;  Hongping He;  Chenchen Qu;  Hui Yin;  Jianxi Zhu;  Runliang Zhu;  Zonghua Qin;  Jing Zhang
2017
Source PublicationChemical Geology
Volume470Pages:132-140
Abstract

Iron oxides are abundant in natural waters and soils and have high capacities for scavenging Pb(II) by adsorption, which affects the transport and fate of Pb on the earth's surface. We investigated the adsorption of Pb (II) on magnetites substituted with commonly incorporated transition metals such as Cr, Mn, Co, and Ni. The adsorption capacity, mechanism, and local coordination of Pb(II) were investigated by traditional macroscopic studies, i.e., acid-base titration and batch adsorption experiment, complemented with X-ray absorption fine structure (XAFS) spectrum analysis and surface complexation model (SCM). The substitution increased the surface site density, while pHpzc did not vary. Pb(II) adsorption was not suppressed by the presence of background electrolyte and improved as pH increased. The isotherms were well fit to the Langmuir adsorption model. The XAFS analysis demonstrated that Pb(II) ions were adsorbed on magnetite surface predominantly via innersphere complexation, where the adsorbed Pb(II) species was in bidentate binuclear corner-sharing geometry, independent of the adsorption capacity. This adsorption geometry can be applied to fit the experimental adsorption data well with the diffuse layer model (DLM). The substitutions improved the adsorption capacity in the following order: Cr > Ni > Mn > Co, and were discussed regarding the measured values of active site density and local coordination of adsorbed Pb(II). This study is the first documentation of Pb(II) adsorption on magnetite with different substitutions. The obtained results are of great significance for the understanding of Pb(II) surface complexation reactions on magnetite surface.

KeywordMagnetite Pb(Ii) Adsorption Acid-base Titration Adsorption Geometry Xafs
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8035
Collection矿床地球化学国家重点实验室
Affiliation1.CAS Key Laboratory of Mineralogy and Metallogeny and Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China
2.Guangdong Key Laboratory of Integrated Agro-Environmental Pollution Control and Management, Guangdong Institute of Eco-Environmental Science & Technology, Guangzhou 510650, PR China
3.University of Chinese Academy of Sciences, Beijing 100049, PR China
4.Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River) Ministry of Agriculture, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, PR China
5.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, PR China
6.Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, PR China
Recommended Citation
GB/T 7714
Xiaoliang Liang;Gaoling Wei;Juan Xiong;Fuding Tan;Hongping He;Chenchen Qu;Hui Yin;Jianxi Zhu;Runliang Zhu;Zonghua Qin;Jing Zhang. Adsorption isotherm, mechanism, and geometry of Pb(II) on magnetites substituted with transition metals[J]. Chemical Geology,2017,470:132-140.
APA Xiaoliang Liang;Gaoling Wei;Juan Xiong;Fuding Tan;Hongping He;Chenchen Qu;Hui Yin;Jianxi Zhu;Runliang Zhu;Zonghua Qin;Jing Zhang.(2017).Adsorption isotherm, mechanism, and geometry of Pb(II) on magnetites substituted with transition metals.Chemical Geology,470,132-140.
MLA Xiaoliang Liang;Gaoling Wei;Juan Xiong;Fuding Tan;Hongping He;Chenchen Qu;Hui Yin;Jianxi Zhu;Runliang Zhu;Zonghua Qin;Jing Zhang."Adsorption isotherm, mechanism, and geometry of Pb(II) on magnetites substituted with transition metals".Chemical Geology 470(2017):132-140.
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