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In situ growth of benzothiadiazole functionalized UiO-66-NH2 on carboxyl modified g-C3N4 for enhanced photocatalytic degradation of sulfamethoxazole under visible light

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Abstract

Developing low-cost and high-performance photocatalysts is significant for environmental protection but still remains challenging. Herein, a list of UiO-66-NH-BT@g-C3N4 composites decorated with electron deficient units were first constructed through a simple step-by-step in situ growth strategy, and the obtained hybrid photocatalysts (denoted as UiO-66-NH-BT@g-C3N4) were then employed as an efficient mediator to activate peroxydisulfate in order to degrade typical antibiotics. Obviously, embedding carboxyl groups on the surface of g-C3N4 would provide a good environment for the growth of UiO-66-NH-BT, while the introduction of benzothiadiazole could effectively facilitate the separation and transfer of charge carriers. Furthermore, the formation of an n–n heterojunction interface between g-C3N4 and UiO-66-NH-BT could further promote charge transfer. As expected, the UiO-66-NH-BT@g-C3N4-2 hybrid photocatalysts showed great photocatalytic activity in SMX degradation, with the highest removal efficiency of 97.6%. A possible photocatalytic mechanism was also proposed. More importantly, the UiO-66-NH-BT@g-C3N4-2 composite with excellent stability can efficiently remove other antibiotics (e.g., TC, OFX, DFC and IBP) in a very short period of time. In short, the current work has not only developed a promising system (namely the UiO-66-NH-BT@g-C3N4-2/PS/solar system) for the removal of contaminants, but has also shared a novel strategy to synthesize a highly-efficient photocatalyst.

Graphical abstract: In situ growth of benzothiadiazole functionalized UiO-66-NH2 on carboxyl modified g-C3N4 for enhanced photocatalytic degradation of sulfamethoxazole under visible light

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Article information


Submitted
18 May 2020
Accepted
16 Jun 2020
First published
16 Jun 2020

Catal. Sci. Technol., 2020, Advance Article
Article type
Paper

In situ growth of benzothiadiazole functionalized UiO-66-NH2 on carboxyl modified g-C3N4 for enhanced photocatalytic degradation of sulfamethoxazole under visible light

S. Lv, J. Liu, C. Li, N. Zhao, Z. Wang and S. Wang, Catal. Sci. Technol., 2020, Advance Article , DOI: 10.1039/D0CY01019G

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