title: Adsorption of As(V) inside the pores of porous hematite in water.
abstract: As(V) adsorption inside the pores of porous hematite in water has been studied in this work. This study was performed on nonporous hematite and porous hematite prepared from the thermal decomposition of goethite and siderite through the measurements of adsorption isotherm, SEM-EDX, XRD and BET. The results demonstrated that the As(V) adsorption was difficult to be realized inside pores if they were too small. This observation might be due to that the pore entrances were blocked by the adsorbed ions and thus the inside surfaces became invalid for the adsorption. Only if the pore size is large enough, the effective surface area inside pores would be close to that on non-porous hematite for As(V) adsorption. In addition, it was found that siderite is better than goethite for preparing porous hematite with thermal decomposition as adsorbent for arsenic removal.
authors.affiliation: School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei 430070, China; Doctorado Institucional de Ingeniería y Ciencia de Materiales, Universidad Autonoma de San Luis Potosi, Av. Sierra Leona 530, San Luis Potosi 78210, 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: 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. Electronic address: shaoxian@uaslp.mx.
authors.forename: Shaoxian
authors.initials: S
authors.lastname: Song
authors.affiliation: The Key Lab of Marine Environmental Science and Ecology of Ministry of Education, Ocean University of China, Qingdao 266100, China.
authors.forename: Changsheng
authors.initials: C
authors.lastname: Peng
authors.affiliation: Doctorado Institucional de Ingeniería y Ciencia de Materiales, Universidad Autonoma de San Luis Potosi, Av. Sierra Leona 530, San Luis Potosi 78210, Mexico.
authors.forename: Alejandro
authors.initials: A
authors.lastname: Lopez-Valdivieso
keywords: As(V) adsorption; Effective surface area; Inside pores; Porous hematite