4.7 Article

Synchronous removal of tetracycline and copper (II) over Z-scheme BiVO4/rGO/g-C3N4 photocatalyst under visible-light irradiation

期刊

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 29, 期 13, 页码 19148-19164

出版社

SPRINGER HEIDELBERG
DOI: 10.1007/s11356-021-16996-4

关键词

Z-scheme BiVO4/rGO/g-C3N4; Copper ions; Tetracycline; Cooperative effects; Removal mechanism

资金

  1. National Natural Science Foundation of China [21707021]
  2. Natural Science Foundation of Guangxi [2020GXNSFAA297034]
  3. Open Fund of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control [2019KF19]
  4. Special Fundings for Innovative Province Construction of Hunan Province [2019GK5011]
  5. Research Project of Bosch Branch of Guangxi University Graduate School [GXU-BFY-2020-036]

向作者/读者索取更多资源

By synthesizing BiVO4/rGO/g-C3N4 nanocomposites, efficient removal of both organic pollutants and heavy metals in water bodies was achieved, showing high removal rates and synergistic effects under light irradiation. The study revealed that the removal mechanism involves a Z-scheme photocatalyst and proposed possible degradation pathways and mechanisms for the photocatalytic degradation of pollutants.
The combined pollution of heavy metals and organic pollutants in water body has become one of vital environmental issues. Herein, a series of BiVO4/rGO/g-C3N4 nanocomposites were synthesized for concurrent removals of organic pollutant and heavy metal. Results showed that using the optimized photocatalyst BiVO4/rGO/g-C3N4-28, tetracycline (TC) removal of 87.3% and copper (Cu (II)) removal of 90.6% were achieved under visible-light irradiation within 3 h, respectively; much higher than those using BiVO4 and g-C3N4. More importantly, synergistic effect of TC and Cu (II) removals occurred on the surface of BiVO4/rGO/g-C3N4 in the TC-Cu (II) coexistence condition. Additionally, the center dot OH and center dot O-2 were the most important active species for TC oxidation, while photogenerated electrons were the most responsible for Cu (II) reduction. Results of various characterizations and electron spin resonance test demonstrated that BiVO4/rGO/g-C3N4 was a Z-scheme photocatalyst. Based on the identified intermediates, possible degradation pathways and mechanisms for photocatalytic degradation of TC were proposed. This study advances the development and mechanism of photocatalysts for collaborative removal of pollutants.

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