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Synchronous removal of tetracycline and copper (II) over Z‑scheme BiVO4/rGO/g-C3N4 photocatalyst under visible-light irradiation
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Journal Article
Synchronous removal of tetracycline and copper (II) over Z‑scheme BiVO4/rGO/g-C3N4 photocatalyst under visible-light irradiation
2022
Overview
The combined pollution of heavy metals and organic pollutants in water body has become one of vital environmental issues. Herein, a series of BiVO
4
/rGO/g-C
3
N
4
nanocomposites were synthesized for concurrent removals of organic pollutant and heavy metal. Results showed that using the optimized photocatalyst BiVO
4
/rGO/g-C
3
N
4
-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 BiVO
4
and g-C
3
N
4
. More importantly, synergistic effect of TC and Cu (II) removals occurred on the surface of BiVO
4
/rGO/g-C
3
N
4
in the TC-Cu (II) coexistence condition. Additionally, the ·OH and ·O
2
ˉ 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 BiVO
4
/rGO/g-C
3
N
4
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.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
