title: Adsorption of As(III) on porous hematite synthesized from goethite concentrate.
abstract: Arsenite (As(III)) is toxic in drinking water, which becomes an environmental concern worldwide. This work was to synthesize porous hematite through the calcination of natural goethite concentrate for As(III) adsorption, including adsorption kinetics, isotherms and the influence of pH and temperature. The calcination was performed at 300 °C for 180 min, producing porous hematite with large amount of micropores. The maximum adsorption capacity of As(III) on porous hematite was achieved at pH 6.0 and 25 °C, about 14.46 mg g-1, compared with 2.965 mg g-1on the original goethite concentrate. The improvement might be attributed to the formation of micropores and thus the increase in the surface area. Also, it was found that the adsorption was strongly pH dependent and reduced with increasing temperature. It is indicated that the low-cost porous hematite has great potential in As(III) removal from contaminated water.
authors.affiliation: Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China.
authors.forename: Xuetong
authors.initials: X
authors.lastname: Yang
authors.affiliation: Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Xia
authors.affiliation: School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China.
authors.forename: Jialei
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China; Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, Av. Sierra Leona 550, Loma 2a Sección, San Luis Potosí, C.P. 78210, S. L. P., Mexico.
authors.forename: Min
authors.initials: M
authors.lastname: Dai
authors.affiliation: School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China.
authors.forename: Guangcheng
authors.initials: G
authors.lastname: Yang
authors.affiliation: Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei, 430070, China. Electronic address: ssx851215@whut.edu.cn.
authors.forename: Shaoxian
authors.initials: S
authors.lastname: Song
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000032:analysis / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D058085:Iron Compounds / Q000737:chemistry*; D007700:Kinetics; D008903:Minerals / Q000737:chemistry*; D008956:Models, Chemical; D016062:Porosity; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D005290:Ferric Compounds; D058085:Iron Compounds; D008903:Minerals; D014874:Water Pollutants, Chemical; C094886:goethite; C000499:ferric oxide; D001151:Arsenic
keywords: As(III) adsorption; Calcination; Goethite; Porous hematite; Surface area