Lead bismuth oxybromide/graphene oxide: Synthesis, characterization, and photocatalytic activity for removal of carbon dioxide, crystal violet dye, and 2-hydroxybenzoic acid

Fu-Yu Liu; Yong-Ming Dai; Fu-Hsuan Chen; Chiing-Chang Chen

doi:10.1016/j.jcis.2019.12.006

Lead bismuth oxybromide/graphene oxide: Synthesis, characterization, and photocatalytic activity for removal of carbon dioxide, crystal violet dye, and 2-hydroxybenzoic acid

J Colloid Interface Sci. 2020 Mar 7:562:112-124. doi: 10.1016/j.jcis.2019.12.006. Epub 2019 Dec 6.

Authors

Fu-Yu Liu¹, Yong-Ming Dai², Fu-Hsuan Chen³, Chiing-Chang Chen⁴

Affiliations

¹ Department of Science Education and Application, National Taichung University of Education, Taichung 40306, Taiwan, ROC.
² Department of Chemical and Materials Engineering, National Chin-Yi University of Technology, Taichung 411, Taiwan, ROC.
³ Department of Political Science, National Taiwan University, Taipei 106, Taiwan, ROC.
⁴ Department of Science Education and Application, National Taichung University of Education, Taichung 40306, Taiwan, ROC. Electronic address: ccchen@mail.ntcu.edu.tw.

PMID: 31837619
DOI: 10.1016/j.jcis.2019.12.006

Abstract

A novel lead bismuth oxybromide/graphene oxide (PbBiO₂Br/GO) composite photocatalyst were prepared using a controlled and nontemplate hydrothermal technique with PbBiO₂Br and GO as the starting material. The heterojunction photocatalysts were characterized through XRD, FE-SEM-EDS, HR-TEM, XPS, DR-UV-vis, BET, PL, EPR, and UPS. Under the optimal synthesis conditions, the photocatalytic activity of PbBiO₂Br/GO composites was much higher than that of PbBiO₂Br. Under 25 °C, 1 atm, and 432-nm visible light irradiation at, the optimized PbBiO₂Br/GO increased the rate (at 1.913 µmol g^-1 h^-1) of photocatalytic conversion from carbon dioxide (CO₂) to methane (CH₄). This conversion rate was higher than that of the original PbBiO₂Br material (0.957 µmol g^-1 h^-1). Therefore, PbBiO₂Br/GO is superior for CH₄ production and has great potential as CO₂ photoreduction catalysts. In addition, such catalytic performance (when using 0.05 wt%-GO/PbBiO₂Br composite as a photocatalyst) indicates that the optimal reaction rate constants of crystal violet (CV) and 2-hydroxybenzoic acid (2-HBA) are 0.1278 and 0.0093 h^-1, respectively, which are 1.82 and 1.24 times the reaction rate constant of PbBiO₂Br as a photocatalyst, respectively. Our findings are useful for PbBiO₂Br/GO synthesis and in its future environmental applications, particularly in solar fuel manufacture.

Keywords: 2-hydroxybenzoic acid; CO(2); Crystal violet; Graphene oxide; Heterojunction; PbBiO(2)Br; Photocatalytic.