期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 457, 期 -, 页码 33-40出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2014.05.034
关键词
LDHs; Cr(VI) adsorption; Desorption; Regeneration; Coexisting anions; Ionic radius
资金
- National Natural Science Foundation of China [21277108, 41173092, 51272201]
- 863 Program [2012AA062701]
- Independent Innovation Research Foundation of Wuhan University of Technology [2013-ZY-075]
Layered double hydroxide (LDH) materials comprising of Mg/Al, Ni/Al and Zn/Al with molar ratio (M2+/Al3+ =3) were synthesized via a facile hydrothermal route. The microstructures, morphologies and textural properties of the LDH materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and N-2 adsorption-desorption techniques. It was found that the three LDHs with different divalent metal cations were constructed from nanosheets with well-defined shapes and sizes. Adsorption rates and isotherms of the LDH adsorbents for Cr(VI) were investigated in batch experiments. Desorption behaviors and regeneration of Cr(VI)-adsorbed LDHs at the solid liquid interface were also studied. The ZnAl-LDH exhibited excellent sorption capacity (68.07 mg/g) for Cr(VI) and good regeneration performance. The effect of coexisting anions on the adsorption performance revealed that the anions (CO32-, HCO3-) greater impact on the adsorption process due to their larger laminate binding energy and closer affinity for hydrotalcite material. (C) 2014 Elsevier B.V. All rights reserved.
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