期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 442, 期 -, 页码 30-38出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2014.11.023
关键词
Adsorption; Clay; Chromium; Ti-Fe kaolinite composite; Photocatalytic reduction
资金
- National Program on Key Basic Research Project of China (973 Program) [2013CB632402]
- Program of Specialized Research Fund for the Doctoral Program of Higher Education [20110143110015]
- National Key Technology R&D Program of China [2012BAJ25B02-03]
A novel bifunctional Ti-Fe kaolinite composite with excellent adsorption and photocatalytic properties was synthesized by a simple precipitation method. X-ray diffraction analysis and high-resolution transmission electron microscope analysis confirmed the existence of rutile phase TiO2 and amorphous iron in the composite. The specific surface area of the Ti-Fe kaolinite composite is 5.5 times higher than that of the original kaolinite. The composite was used as an adsorbent as well as photocatalyst for Cr(VI) removal. The results indicate that the low pH is favorable to the Cr(VI) removal by the composite and the removal rate of Cr(VI) reached 87% at pH 3.0. Visible light irradiation obviously increased the removal of Cr(VI) by the composite and greatly shortened reaction equilibrium time, which may be attributed to the photocatalytic reduction of Cr(VI) to Cr(III) by TiO2 associated with simultaneous redox cycle of Fe(III)/Fe(II). Various common co-existing ions did not show obvious effects on the removal of Cr(VI) by the composite. The composite exhibited very high stability for the Cr(VI) removal. The adsorption models and thermodynamics of Cr(VI) onto the composite were studied. (C) 2014 Elsevier Inc. All rights reserved.
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