☆ 4.7 Article

In-situ construction of core-shell structured TiB2-TiO2@g-C3N4 for efficient photocatalytic degradation

APPLIED SURFACE SCIENCE (2022)

Journal

APPLIED SURFACE SCIENCE

Volume 579, Issue -, Pages -

Publisher

ELSEVIER

DOI: 10.1016/j.apsusc.2021.152201

Keywords

g-C3N4; TiB2; Core-Shell structure; Photocatalysts; Heterojunction

Funding

Natural Science Foundation of Jiangsu Province [BK20200237]
Young Taishan Scholars Program of Shandong Province [201909026]
Youth Interdisciplinary Science and Innovative Research Groups of Shandong University [2020QNQT014]
Key Laboratory of Organic Compound Pollution Control Engineering (MOE) Foundation [20190202]

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Abstract

The study successfully constructed a core-shell structured TiB2TiO2@g-C3N4 heterojunction photocatalyst, which exhibited better photodegradation performance for organic pollutants RhB and 4-CP compared to pure g-C3N4. By building 'TiB2 bridges' on the surface of TiB2-TiO2 cores and a Z-scheme heterojunction with g-C3N4, fast electronic transmission channels were formed and recombination of photogenerated charges was effectively inhibited.

g-C3N4 based heterojunction photocatalysts attract much attention as degradation materials for organic pollutants due to their wide light absorption range and rich photoinduced carriers. Strategies to effectively improve photoelectron separation and transmission have become a research hotspot. Herein, a novel heterojunction TiB2TiO2@g-C3N4 photocatalyst with core-shell structure was constructed by in-situ growth of g-C3N4 on the TiB2TiO2 cores using one-step calcination method. The composite processes a higher photodegradation performance of Rhodamine B (RhB) and 4-Chlorophenol (4-CP) compared to the pure g-C3N4. The results show that the surface of TiB2-TiO2 cores contains numerous 'TiB2 bridges', as photoinduced carriers transport channels, which effectively accelerate photoinduced e- and h+ migration. In addition, the g-C3N4 coated on TiB2-TiO2 cores forms a Z-scheme heterojunction, which hinders the recombination of photogenerated charges resulting in a longer electron lifetime. Furthermore, the TiB2 also could act as acceptors of electrons for the formation of center dot O2-. The main active substances for degradation of RhB are center dot OH, center dot O2- and h+. This strategy is applicable to design highly capable heterojunction photocatalysts by constructing fast electronic transmission channels.

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Co3O4 Nanosheet/g-C3N4 Hybrid Photocatalysts for Promoted H2 Evolution

Shuhang Chen, Wentao Wang, Ying Hou, Yachao Hao, Yangcan Zhao, Siyan Wang, Jianfang Meng, Hongyan Xu

Summary: Co3O4 nanosheet/g-C3N4 hybrids, with the optimized hybrid of 20 wt % g-C3N4 (20-CNCo) displaying the best photocatalytic performances for H-2 evolution, with an average H-2 evolution rate of 134.6 mu mol center dot g(-1)center dot h(-1). The enhanced photocatalytic H-2 evolution activities of 20-CNCo were attributed to the formation of heterojunctions between Co3O4 nanosheets and g-C3N4, increasing optical absorption ability, promoting charge separation, accelerating electron transfer, and prolonging excited electrons' lifetime. The unique S-scheme charge transfer mechanism retained strong redox ability, contributing to H-2 evolution. This work provides strategies for designing active catalysts for photocatalytic reactions.

ACS APPLIED NANO MATERIALS (2023)