Preparation of Non-Covalent BPTCD/g-C<sub>3</sub>N<sub>4</sub> Heterojunction Photocatalysts and Photodegradation of Organic Dyes Under Solar Irradiation
In this study, the BPTCD/g-C<sub>3</sub>N<sub>4</sub> heterojunction photocatalyst was successfully prepared by the hydrothermal method. BPTCD (3,3′,4,4′-benzophenone tetracarboxylic dianhydride) is immobilised on the surface of g-C<sub>3</sub>N<sub>4</su...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-07-01
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| Series: | Nanomaterials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2079-4991/15/14/1131 |
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| Summary: | In this study, the BPTCD/g-C<sub>3</sub>N<sub>4</sub> heterojunction photocatalyst was successfully prepared by the hydrothermal method. BPTCD (3,3′,4,4′-benzophenone tetracarboxylic dianhydride) is immobilised on the surface of g-C<sub>3</sub>N<sub>4</sub> by non-covalent π-π stacking. The BPTCD/g-C<sub>3</sub>N<sub>4</sub> heterojunction photocatalyst is an all-organic photocatalyst with significantly improved photocatalytic performance compared with g-C<sub>3</sub>N<sub>4</sub>. BPTCD/g-C<sub>3</sub>N<sub>4</sub>-60% was able to effectively degrade MO solution (10 mg/L) to 99.9% and 82.8% in 60 min under full spectrum and visible light. The TOC measurement results indicate that MO can ultimately be decomposed into H<sub>2</sub>O and CO<sub>2</sub> through photocatalytic action. The photodegradation of methyl orange by BPTCD/g-C<sub>3</sub>N<sub>4</sub> composite materials under sunlight is mainly attributed to the successful construction of the heterojunction structure and its excellent π-π stacking effect. Superoxide radicals (<sup>•</sup>O<sub>2</sub><sup>−</sup>) were found to be the main active species, while <sup>•</sup>OH and h<sup>+</sup> played a secondary role. The synthesised BPTCD/g-C<sub>3</sub>N<sub>4</sub> also showed excellent stability in the activity of photodegradation of MO in wastewater, with the performance remaining above 90% after three cycles. The mechanism of the photocatalytic removal of MO dyes was also investigated by the trap agent experiments. Additionally, BPTCD/g-C<sub>3</sub>N<sub>4</sub>-60% demonstrated exceptional photodegradation performance in the degradation of methylene blue (MB). BPTCD/g-C<sub>3</sub>N<sub>4</sub> heterojunctions have great potential to degrade organic pollutants in wastewater under solar irradiation conditions. |
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| ISSN: | 2079-4991 |