Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 662, Issue -, Pages 165-172Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2015.12.019
Keywords
TiO2/Activated carbon; Adsorption; Nitrogen doping; Heterojunction; Photoreduction; Cr(VI)
Categories
Funding
- Foundation of National Key Scientific Instrument and Equipment Development Project of China [2014YQ060773]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Opening Foundation of Huaian Research Institute, Hohai University
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The surface NH2-grafting on activated carbon (AC), N-doping into TiO2 and dense interfacial heterojunctions between AC and TiO2 were achieved synchronously by treating of TiO2/AC with ethylenediamine. The obtained materials were characterized and applied for the removal of aqueous Cr(VI) through their adsorption and visible-light-driven photoreduction. Results obtained showed that ethylenediamine was grafted covalently onto AC through amide linkage, and simultaneously, served as the precursor of nitrogen doped into TiO2. Improved performance of modified TiO2/AC for Cr(VI) removal was acquired, which can be attributed to the multiple roles of ethylenediamine modification at TiO2/AC as: to enhance the adsorption capability of AC for Cr(VI) through electrostatic, coordinative and hydrogen bonding; to extend and intensify the optical absorption on TiO2; to promote the forming of dense heterojunctions between TiO2 and AC through TieOeC linkages, facilitating the intimate contact and fast interfacial mass transfer of Cr(VI) and photo-generated electrons between AC and TiO2. (C) 2015 Elsevier B.V. All rights reserved.
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