期刊
CHEMICAL ENGINEERING JOURNAL
卷 324, 期 -, 页码 140-153出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.05.009
关键词
Tin disulfide; Polyvinyl alcohol; Nanocomposites; Photocatalytic; Cr(VI) reduction
资金
- National Natural Science Foundation of China [21475116, 21673203]
- Qing Lan Project
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- University of Cincinnati through a UNESCO co-Chair
This study focuses on the synthesis of a new high efficiency visible-light photocatalyst made of SnS2 and conjugated derivative (CPVA) from thermal dehydration of polyvinyl alcohol (PVA), and the evaluation of its performance in photocatalytic reduction of aqueous Cr(VI). SnS2/CPVA nanocomposites were synthesized via the procedures of (i) mixing of SnS2 nanocrystals and PVA in aqueous solution and evaporation of the aqueous solvent to generate SnS2/PVA nanocomposites, and (ii) thermal treatment of the SnS2/PVA nanocomposites for transforming their PVA into conjugated CPVA. The optimum conditions for synthesis of most efficient SnS2/CPVA nanocomposite were explored. The characterization by X-ray diffraction, Raman spectroscopy, infrared spectroscopy, X-ray photoelectron spectroscopy, high resolution transmission electron microscopy and elemental mapping indicated the formation of SnS2/CPVA nanocomposites. The photocatalytic experiments showed that SnS2/CPVA nanocomposite synthesized under the optimum conditions (SnS2/CPVA-1%-180 degrees C-2h) had exceptionally higher photocatalytic activity than SnS2 nanocrystals, physical mixture of SnS2 nanocrystals and CPVA, SnS2/CPVC nanocomposite and TiO2/CPVA nanocomposite in the reduction of aqueous Cr(VI) under visible-light (wavelength > 420 nm) irradiation. The mechanism underlying the most enhanced photocatalytic activity of SnS2/CPVA-1%-180 degrees C-2 h was elucidated, based upon comparison between the optical, photoelectric and electrochemical impedance properties of SnS2 nanocrystals and different SnS2/CPVA nanocomposites. Furthermore, the effects of photocatalytic experiment parameters (including dosage of photocatalyst, and initial pH and concentration of Cr(VI) aqueous solution) on the Cr(VI) removal efficiency by SnS2/CPVA-1%-180 degrees C-2h were also studied. (C) 2017 Elsevier B.V. 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