Lanthanum activated palygorskite for selective phosphate separation from aqueous media: Comprehensive understanding of adsorptive behavior and mechanism affected by interfering substances

doi:10.1016/j.cej.2022.136423

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	Lanthanum activated palygorskite for selective phosphate separation from aqueous media: Comprehensive understanding of adsorptive behavior and mechanism affected by interfering substances
	Mi, Xiao 4; Yu, Fan 4; Zhang, Huining 3; Chen, Rongfan 1; Hu, Xiaoling 1; Zhang, Wei 2; Wang, Bin 1
刊名	Chemical Engineering Journal
	2022-09-01
卷号	443
关键词	Adsorption Etching Eutrophication Lanthanum compounds Separation Active site Adsorption behaviour Alkalines Aqueous media Co-existing Co-existing substance Interfering substances Palygorskites Phosphate separation Waterbodies
ISSN号	1385-8947
DOI	10.1016/j.cej.2022.136423
英文摘要	Eutrophication problem in surface waterbodies has attracted increasing attention. Herein, raw palygorskite (PAL) was activated by lanthanum engineering in alkaline surrounding for phosphate removal, and alkaline etching modified its structure and facilitated phosphate migration from bulk solution to active sites. Results indicated that stable and satisfactory phosphate capturing was maintained by as-prepared material within a wide pH range (3–9) and the disturbance of co-existing substances (Cl-, NO3–, HCO3–, SO42–, F- and HA). Further investigation on the role of interfering species in overall adsorption process indicated that phosphate capturing was accelerated rather than hindered at the initial hours, while the ultimate captured amount decreased owing to their competitive occupation on La active sites. Kinetic study suggested the chemisorption of phosphate and isotherm investigation illustrated the multilayer coverage of phosphate on the heterogeneous surface. Thermodynamic study implied spontaneous and endothermic process of phosphate uptake on La-PAL, and cyclic desorption-adsorption experiments demonstrated feasible regeneration and reuse of La-PAL for phosphate separation. Materials characterization demonstrated the formation of amorphous La-O-P inner-sphere complex through ligands exchange (i.e., –CO3–, –OH), whereas the interference of co-existing substances by competitive occupation and overlap on active sites was indicated. The present work could provide comprehensive insight into the role of interfering substances in phosphate adsorption on functionalized materials. © 2022 Elsevier B.V.
WOS研究方向	Engineering
语种	英语
出版者	Elsevier B.V.
WOS记录号	WOS:000799988300003
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/158477]
专题	土木工程学院
作者单位	1.School of Civil Engineering, Wuhan University, Wuhan; 430072, China; 2.School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha; 410114, China 3.School of Civil Engineering, Lanzhou University of Technology, China; 4.School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Henan, Zhengzhou; 450011, China;
推荐引用方式 GB/T 7714	Mi, Xiao,Yu, Fan,Zhang, Huining,et al. Lanthanum activated palygorskite for selective phosphate separation from aqueous media: Comprehensive understanding of adsorptive behavior and mechanism affected by interfering substances[J]. Chemical Engineering Journal,2022,443.
APA	Mi, Xiao.,Yu, Fan.,Zhang, Huining.,Chen, Rongfan.,Hu, Xiaoling.,...&Wang, Bin.(2022).Lanthanum activated palygorskite for selective phosphate separation from aqueous media: Comprehensive understanding of adsorptive behavior and mechanism affected by interfering substances.Chemical Engineering Journal,443.
MLA	Mi, Xiao,et al."Lanthanum activated palygorskite for selective phosphate separation from aqueous media: Comprehensive understanding of adsorptive behavior and mechanism affected by interfering substances".Chemical Engineering Journal 443(2022).