Accelerated separation of photogenerated charge carriers and enhanced photocatalytic performance of g-C3N4 by Bi2S3 nanoparticles
作者:Qiang Hao、Ci'an Xie、Yongming Huang、Daimei Chen、Yiwen Liu、Wei Wei、Bing-Jie Ni
DOI:10.1016/s1872-2067(19)63450-9
日期:2020.2
Employing photothermal conversion to improve the photocatalytic activity of g-C3N4 is rarely re-Received 1 July 2019 ported previously. Herein, different ratios of g-C3N4/Bi2S3 heterojunction materials are synthesized Accepted 12 July 2019 by a facile ultrasonic method. Advanced characterizations such as X-ray diffraction, Fourier trans-Published 5 February 2020 form infrared spectroscopy, X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy are employed to analyze the morphology and structure of the prepared materials. Compared with sole counterparts, the heterojunction materials CN-BiS-2 exhibit significantly enhanced photocatalytic performance, which is 2.05-fold as g-C3N4 and 4.42-fold as Bi2S3. A possible degradation pathway of methylene blue (MB) was proposed. Based on the photoproduced high-energy electrons and photothermal effect of Bi2S3, the transfer and separation of electron-hole pairs are greatly enhanced and more active species are produced. In addition, the relatively high utilization efficiency of solar energy has synergistic effect for the better photocatalytic performance. (C) 2020, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
A facile hydrothermal method to BiSbO4 nanoplates with superior photocatalytic performance for benzene and 4-chlorophenol degradations
作者:Qingqing You、Yanghe Fu、Zhengxin Ding、Ling Wu、Xuxu Wang、Zhaohui Li
DOI:10.1039/c1dt10130g
日期:——
BiSbO4 nanoplates with a large BET specific area has been prepared successfully via a facile hydrothermal reaction from Sb2O3 and Bi(NO3)3. The effects of reaction conditions and the precursors on the final products were investigated. It is proposed that the redox reaction between Sb2O3 and Bi(NO3)3 plays a pivotal role in the formation of nanocrystalline BiSbO4. The hydrothermally prepared nanocrystalline BiSbO4 was characterized by X-ray diffraction (XRD), N2-sorption BET surface area, UV-vis diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The DRS result clarifies that BiSbO4, originally believed to be a visible light responsive photocatalyst, is indeed UV light responsive with a band gap of 3.5 eV. The existence of Bi containing an impurity may be responsible for the visible light response of BiSbO4 prepared via a conventional solid state reaction. BiSbO4 nanoplates prepared via the hydrothermal method showed superior photocatalytic performance for the degradation of benzene and 4-chlorophenol (4-CP) as compared to BiSbO4 prepared via a solid state reaction and Degussa P25. BiSbO4(Hy) nanoplates can be a promising photocatalyst in the treatment of environmental pollution.