Adsorption isotherm, mechanism, and geometry of Pb(II) on magnetites substituted with transition metals

doi:10.1016/j.chemgeo.2017.09.003

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	Adsorption isotherm, mechanism, and geometry of Pb(II) on magnetites substituted with transition metals
	Qu, CC; He, HP; Tan, FD; Liang, XL; Wei, GL; Xiong, J; Zhang J(张静); Zhang, J; Qin, ZH; Zhu, RL
刊名	CHEMICAL GEOLOGY
	2017
卷号	470 页码:132-140
关键词	Magnetite Pb(II) adsorption Acid-base titration Adsorption geometry XAFS
ISSN号	0009-2541
DOI	10.1016/j.chemgeo.2017.09.003
文献子类	Article
英文摘要	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.
电子版国际标准刊号	1878-5999
WOS关键词	OXIDE-WATER INTERFACES ; SURFACE COMPLEXATION ; AQUEOUS-SOLUTION ; NEUTRAL PH ; GOETHITE ; SORPTION ; ACID ; IRON ; NANOPARTICLES ; HEMATITE
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000412550700010
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/285288]
专题	高能物理研究所_核技术应用研究中心高能物理研究所_实验物理中心高能物理研究所_多学科研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Qu, CC,He, HP,Tan, FD,et al. Adsorption isotherm, mechanism, and geometry of Pb(II) on magnetites substituted with transition metals[J]. CHEMICAL GEOLOGY,2017,470:132-140.
APA	Qu, CC.,He, HP.,Tan, FD.,Liang, XL.,Wei, GL.,...&Yin, H.(2017).Adsorption isotherm, mechanism, and geometry of Pb(II) on magnetites substituted with transition metals.CHEMICAL GEOLOGY,470,132-140.
MLA	Qu, CC,et al."Adsorption isotherm, mechanism, and geometry of Pb(II) on magnetites substituted with transition metals".CHEMICAL GEOLOGY 470(2017):132-140.