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Activation of peroxymonosulfate by S-scheme Bi2S3/doped gCN heterostructure photocatalyst for highly efficient visible light driven tetracycline degradation: Insights into reaction mechanisms by Poulomi Sarkar; Sudarsan Neogi; Sirshendu De is a Engineering article available to read on EtoBox.

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A solid state microwave (MW) assisted hydrothermal method was used to prepare S-scheme heterojunction composite Bi2S3@doped gCN (BS@CN). TC was degraded upto 99.9 % under 20 min visible light, with synergistic action of 0.2 g/L catalyst having 10 wt% Bi2S3 (BS(10)@CN) and 1.5 g/L PMS, for initial TC concentration of 50 mg/L, exhibiting first order rate constant (kapp): 0.215 min−1. The modulation of band-structure due to the generation of heterojunction, coupled with different surface-bound redox cycles, i.e., Co 2 + /Co 3 + surf . , Ce 3 + /Ce 4 + surf . and Bi 3 + /Bi 4 + surf . , helped the charge migration, separation of excited e-/h+ and production of reactive species, like, SO 4 ∙ - , ∙ OH , O 2 ∙ - , O 2 1 , etc., that played important roles towards TC degradation. Band-structure determination, XPS analysis and other characterizations revealed the formation of S-scheme configuration and corresponding surface-bound metastable complexes towards self-regeneration and excellent catalytic activity of the composite, even in the contaminated real-life surface water sources. Extensive intermediate analysis was carried out to develop a detailed TC degradation pathway. The BS@CN photo

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Author

Poulomi Sarkar; Sudarsan Neogi; Sirshendu De

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)