Synergy of Photocatalysis and Adsorption for Simultaneous Removal of Hexavalent Chromium and Methylene Blue by g-C 3 N 4 /BiFeO 3 /Carbon Nanotubes Ternary Composites

Huiwen Huo, Xinjiang Hu, Hui Wang, Jiang Li, Guangyu Xie, Xiaofei Tan, Qi Jin, Daixi Zhou, Chuang Li, Guoqiang Qiu and Yunguo Liu
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Huiwen Huo: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Xinjiang Hu: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Hui Wang: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Jiang Li: School of Architecture and Art, Central South University, Changsha 410082, China
Guangyu Xie: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Xiaofei Tan: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
Qi Jin: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Daixi Zhou: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Chuang Li: College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China
Guoqiang Qiu: Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha 410004, China
Yunguo Liu: College of Environmental Science and Engineering, Hunan University, Changsha 410082, China

IJERPH, 2019, vol. 16, issue 17, 1-18

Abstract: A novel graphite-phase carbon nitride (g-C 3 N 4 )/bismuth ferrite (BiFeO 3 )/carbon nanotubes (CNTs) ternary magnetic composite (CNBT) was prepared by a hydrothermal synthesis. Using this material, Cr(VI) and methylene blue (MB) were removed from wastewater through synergistic adsorption and photocatalysis. The effects of pH, time, and pollutant concentration on the photocatalytic performance of CNBT, as well as possible interactions between Cr(VI) and MB species were analyzed. The obtained results showed that CNTs could effectively reduce the recombination rate of electron-hole pairs during the photocatalytic reaction of the g-C 3 N 4 /BiFeO 3 composite, thereby improving its photocatalytic performance, while the presence of MB increased the reduction rate of Cr(VI). After 5 h of the simultaneous adsorption and photocatalysis by CNBT, the removal rates of Cr(VI) and MB were 93% and 98%, respectively. This study provides a new theoretical basis and technical guidance for the combined application of photocatalysis and adsorption in the treatment of wastewaters containing mixed pollutants.

Keywords: hexavalent chromium; methylene blue; adsorption; photocatalysis; synergistic treatment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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