Low-temperature in situ fabrication of porous S-doped g-C3N4 nanosheets using gaseous-bubble template for enhanced visible-light photocatalysis
- Authors
- Kadam, Abhijit N.; Kim, Hansang; Lee, Sang-Wha
- Issue Date
- Dec-2020
- Publisher
- ELSEVIER SCI LTD
- Keywords
- In situ fabrication; Low temperature; Photocatalysis; Porous S-g-C3N4; Visible light
- Citation
- Ceramics International, v.46, no.18, pp.28481 - 28489
- Journal Title
- Ceramics International
- Volume
- 46
- Number
- 18
- Start Page
- 28481
- End Page
- 28489
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/79202
- DOI
- 10.1016/j.ceramint.2020.08.005
- ISSN
- 0272-8842
- Abstract
- Developing one-step modification strategy for highly efficient metal-free g-C3N4 photocatalyst has always been challenging and yet demanding. In this study, we have demonstrated an in-situ low-temperature production of porous S-doped g-C3N4 nanosheets, using ammonium chloride (NH4Cl) as a gaseous-bubble template (GBT) to boost the visible-light photocatalytic degradation of organic pollutant dyes. The photocatalytic activities of GBT-induced porous S-doped g-C3N4 nanosheets (so-called p–SCN–x, x = mass ratio of NH4Cl/thiourea) were examined towards the degradation of Rhodamine B (Rh.B) under visible light. Importantly, both surface area and photocatalytic activities of the p-SCN–xsample were optimized by adjusting the mass fraction of thiourea/NH4Cl. The optimized p–SCN–2 exhibited a maximum photocatalytic degradation of 97.50%, which is 7.75-fold higher than that of GBT-free analogue (so-called bulk SCN-0). Moreover, the p–SCN–2 was tested for colorless tetracycline hydrochloride as an emerging pollutant, demonstrating 87% degradation under visible light irradiation. The enhanced performance of p-SCN–2photocatalyst was mainly attributed to an improved surface area, boosted light-harvesting range, and efficient electron-hole separation, and facilitated transfer of charge carriers by dye-sensitization mechanism. Moreover, the scavengers quenching study proved that the superoxide anion (•O2−) radicals and holes (h+) were the leading active sorts. In situ fabrication of p-SCN–x nanosheets at low temperature provided an inexpensive and green synthetic route for highly active g-C3N4–based photocatalysts that can resolve environmental pollution and clean energy issues. © 2020 Elsevier Ltd and Techna Group S.r.l.
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