期刊
JOURNAL OF CLEANER PRODUCTION
卷 130, 期 -, 页码 126-136出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2015.10.098
关键词
Chromium; TiO2; Chitosan; Photocatalysis; Adsorption; Bio-catalyst
资金
- Naresuan University Research through Center of Excellence on Environmental Research and Innovation, Faculty of Engineering, Naresuan University [R2558B024]
A novel bio-catalyst, titania-impregnated chitosan/xylan hybrid film was prepared by addition of titanium dioxide in the mixture solution of chitosan and xylan in acetic acid. The structure and surface morphology of the obtained catalyst were characterized by X-ray diffraction, and scanning electron microscope. The adsorption and photocatalytic activity of this photocatalyst were evaluated by photo catalytic reduction of chromium(VI) in aqueous solution under ultraviolet irradiation. From the rough surface modification from xylan addition and the chelating ability of chitosan, the enhancement of chromium(VI) removal by adsorption and photocatalysis of this bio-catalyst was pronounced. The photocatalytic reduction rate of chromium(VI) was 0.56 x 10(-3) and 0.03 x 10(-3) ppm-min for the titania bio-catalyst and titania nanopowder, respectively. The adsorption of chromium(VI) followed the Lang-muir adsorption isotherm model. Pseudo-first order model well described the photocatalytic reduction reactions of the bio-catalyst. Significant dependence of chromium(VI) removal on the titania and chitosan loading can be explained in terms of the relationship between kinetics of chromium(VI) photo catalytic reactions and the loading amount of each chemical. According to the Langmuir-Hinshelwood model, the photocatalytic rate constant of surface reaction of chromium(VI) was increased with an increasing of chemical loading (titania and chitosan) in bio-catalyst. Results from this work exhibited that the novel titania-impregnated chitosan/xylan hybrid film can be a potential material for heavy metal removal in photocatalytic process. (C) 2015 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据