Low-temperature synthesis of graphene/Bi2Fe4O9 composite for synergistic adsorption-photocatalytic degradation of hydrophobic pollutant under solar irradiation

被引:111
|
作者
Hu, Zhong-Ting [1 ]
Liu, Jincheng [2 ]
Yan, Xiaoli [1 ,2 ]
Oh, Wen-Da [1 ,2 ]
Lim, Teik-Thye [1 ,2 ]
机构
[1] Nanyang Technol Univ, Sch Civil & Environm Engn, Div Environm & Water Resources Engn, Singapore 639798, Singapore
[2] Nanyang Technol Univ, Nanyang Environm & Water Res Inst, Singapore 637141, Singapore
关键词
Bismuth ferrite; Graphene; Low-temperature; Photocatalysis; Solar simulator; MICROWAVE HYDROTHERMAL SYNTHESIS; BISPHENOL-A; LIGHT; TIO2; OXIDE; WATER; REDUCTION; FILMS; MICROSTRUCTURE; NANOCOMPOSITES;
D O I
10.1016/j.cej.2014.10.037
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A graphene-supported bismuth ferrite (BF0249/rG04.5) that exhibits a highly effective solar photocatalysis was synthesized via a facile co-precipitation method at a low temperature of 95 C. BF0249/rG04.5 has a 2D composite structure and the deposited bismuth ferrite (BF0249) nanoparticles have an average size of 5 nm. Fourier transform-infrared (FT-IR) analysis shows that the resulting BF0249/rG04.5 catalysts are chemically bonded composites possibly with Fe-O-C and/or Bi-O-C bonds. Photoluminescence evaluation indicates that rGO can effectively suppress the recombination of e(-)/h(+) pairs in BF0249. The adsorption and photocatalytic performance was evaluated using a hydrophobic pollutant (bisphenol A). The adsorption capacity of BPA on BF0249/rG04.5 is 4 mg g(-1), which is ca. 5.5 times higher than that of pristine BF0249. Under visible-light region of full solar spectrum, BF0249/rG04.5 shows a great synergistic adsorption-photocatalytic degradation efficiency of 62% after 3 h (similar to 2 times higher than that of BF0249) and the corresponding mineralization is 47%. The predominant reactive oxygen species (ROS) for BPA degradation was identified to be the O-2(center dot-). When BPA solution containing BF0249/rG04.5 was exposed to the full solar spectrum, 76% and 80% of BPA can be removed at pH 6.5 and 5, respectively, in 3 h. The presence of bicarbonate induces moderate inhibitory effect on the photocatalytic degradation (PCD) of BPA by BF0249/rG04.5 while sulfate, chloride or nitrate exhibit only minor effect. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:1022 / 1032
页数:11
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