In situ synthesis of layered double hydroxides on γ-Al2O3and its application in chromium(VI) removal.
Mg-Al layered double hydroxides (LDHs) adsorbent was synthesized in situ on γ-Al2O3for the removal of Cr(VI) from aqueous solution. The material was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electronic microscopy and thermogravimetry and differential thermal analysis. Compared to the LDHs powder, the calcined LDHs sorbent prepared in situ on γ-Al2O3had higher specific surface area and was easy to recover and reuse. The adsorptive capacity for removing Cr(VI) from aqueous solution was resulting from the memory effect of LDHs based on the XRD results. Both the pseudo-second-order kinetic model and the Langmuir model fit the experimental data well. Furthermore, the adsorbent exhibits excellent sorption-regeneration performances.
Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang 100142, China E-mail: li.shi.feng@163.com; Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
Shifeng
S
Li
Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang 100142, China E-mail: li.shi.feng@163.com.
Fang
F
Qi
College of Environment, Shenyang University, Shenyang 110044, China.
Min
M
Xiao
Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang 100142, China E-mail: li.shi.feng@163.com.
Hongtao
H
Fan
Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang 100142, China E-mail: li.shi.feng@163.com.
Yanming
Y
Shen
Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang 100142, China E-mail: li.shi.feng@163.com.
Kaige
K
Du
Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang 100142, China E-mail: li.shi.feng@163.com.
Zhigang
Z
Zhang
Liaoning Provincial Key Laboratory of Chemical Separation Technology, Shenyang University of Chemical Technology, Shenyang 100142, China E-mail: li.shi.feng@163.com.
Wenxiu
W
Li
D000327:Adsorption; D000537:Aluminum Oxide / Q000737:chemistry*; D002857:Chromium / Q000302:isolation & purification*; D006878:Hydroxides / Q000138:chemical synthesis* / Q000737:chemistry; D007700:Kinetics; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013696:Temperature; D013818:Thermogravimetry; D014961:X-Ray Diffraction
D006878:Hydroxides; D002857:Chromium; C074702:chromium hexavalent ion; D000537:Aluminum Oxide