title: Removal of hexavalent chromium from aqueous solution by calcined Zn/Al-LDHs.
abstract: In this study, Zn/Al-layered double hydroxides (Zn/Al-LDHs) were synthesized by a co-precipitation method and characterized with X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. Then the hexavalent chromium Cr(VI) adsorption experiments on calcined Zn/Al-LDHs were carried out to analyze the effects of pH, temperature, adsorption time, initial Cr(VI) concentration and adsorbent dosage on the removal of Cr(VI) from aqueous solutions. The maximum adsorption capacity for Cr(VI) on calcined Zn/Al-LDHs under optimal conditions was found to be over 120 mg/g. The kinetic and isotherm of Cr(VI) adsorption on calcined Zn/Al-LDHs can be described with the pseudo-second-order kinetic model and Langmuir isotherm, respectively.
authors.affiliation: School of Chemical Engineering, China University of Mining & Technology, Xuzhou 221116, China E-mail: yunpengzhao2009@163.com.
authors.forename: Hui-Duo
authors.initials: HD
authors.lastname: Yang
authors.affiliation: School of Chemical Engineering, China University of Mining & Technology, Xuzhou 221116, China E-mail: yunpengzhao2009@163.com.
authors.forename: Yun-Peng
authors.initials: YP
authors.lastname: Zhao
authors.affiliation: School of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China.
authors.forename: Shi-Feng
authors.initials: SF
authors.lastname: Li
authors.affiliation: School of Chemical Engineering, China University of Mining & Technology, Xuzhou 221116, China E-mail: yunpengzhao2009@163.com.
authors.forename: Xing
authors.initials: X
authors.lastname: Fan
authors.affiliation: School of Chemical Engineering, China University of Mining & Technology, Xuzhou 221116, China E-mail: yunpengzhao2009@163.com.
authors.forename: Xian-Yong
authors.initials: XY
authors.lastname: Wei
authors.affiliation: School of Chemical Engineering, China University of Mining & Technology, Xuzhou 221116, China E-mail: yunpengzhao2009@163.com.
authors.forename: Zhi-Min
authors.initials: ZM
authors.lastname: Zong
mesh_terms: D000327:Adsorption; D002857:Chromium / Q000737:chemistry*; D006878:Hydroxides / Q000737:chemistry*; D007700:Kinetics; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry*
chemical_list: D006878:Hydroxides; D011108:Polymers; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; D015032:Zinc