Revealing the charge transfer mechanism in Er ion‑doped Bi4O5Br2/ g‑C3N5 nanocomposite for efficient photocatalytic degradation of antibiotic tetracycline

서지정보

· 발행기관 : 한국탄소학회
· 수록지 정보 : Carbon letters / 33권 / 7호
· 저자명 : Sethumathavan Vadivel, Lalitha Gnanasekaran, N. Balasubramanian

목차

Revealing the charge transfer mechanism in Er ion-doped Bi4O5Br2g-C3N5 nanocomposite for efficient photocatalytic degradation of antibiotic tetracycline
Abstract
1 Introduction
2 Experimental studies
2.1 Synthesis of Er-Bi4O5Br2g-C3N5 nanocomposite
2.2 Characterization
2.3 Photocatalytic measurements
3 Results and discussion
3.1 XRD analysis
3.2 FT-IR analysis
3.3 Optical properties
3.4 Morphological investigations:
3.5 XPS analysis
3.6 Photocatalysis measurements
3.7 Effect of various pH, tetracycline concentration, and Catalyst loading
3.8 Photocatalysis mechanism
4 Conclusions
References

영어초록

Pharmaceutical products occurring in freshwater bodies create numerous problems for the water bodies owing to their bio-toxic nature. In order to remove such pharmaceutical pollutants, a novel Er-doped Bi4O5Br2/ g-C3N5 nanocomposite was prepared by one-pot synthesis and applied for the photocatalytic removal process. The Er ions doped on the surface of Bi4O5Br2/ g-C3N5 nanocomposite exhibited 97% degradation of tetracycline in 60 min under visible light irradiation, which is higher than pure g-C3N5 and Bi4O5Br2 photocatalysts. The improved photocatalytic properties are attributed to the outstanding visible light harvesting capacity and quick charge carrier separation efficiency which greatly reduced the recombination rate in the heterojunctions. Based on radical trapping experiments, the •O2 −, h+ and •OH radicals played a prominent role in the photodegradation reactions under visible light. Finally, the ternary Er-doped Bi4O5Br2/ g-C3N5 nanocomposite is effectively recyclable with quite a stable photocatalytic removal rate. This work enables a new perspective on the rational design of rare-earth-based nanocomposites for various pharmaceutical pollutants treatment processes.

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