Improved photocatalytic activation of PMS using Co-doped g-C3N4 composites for effective degradation of tetracycline: Catalyst performance, photogenerated carrier transfer and degradation mechanism

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2024-10-06 DOI:10.1016/j.materresbull.2024.113132

Zhao Mu , Hao Chen , Xiao Feng , Tengfeng Xie , Dejun Wang , Yanhong Lin

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Abstract

Photocatalytic coupled SO₄^•- based advanced oxidation processes (SR-AOPs) are considered as an advanced wastewater treatment technology for degrading pollutants. In this work, Co-doped g-C₃N₄ (CCN) photocatalysts were successfully designed for activation of permonosulfate (PMS) under visible light to efficiently degrade tetracycline (TC). The CCN photocatalyst exhibited enhanced degradation efficiency, removing 95.9 % of TC within 20 min, with a much higher degradation rate constant (0.1354 min^-1) than that of the photocatalytic system (0.0090 min^-1) and the SR-AOPs system (0.0538 min^-1). The separation and transport properties of photogenerated carriers were probed with the assistance of measurements including surface photovoltage and photoluminescence. The results showed that the introduction of Co promoted the effective separation of photogenerated charges in CCN, which accelerated the Co^3+/2+ cycle and realized the efficient activation of PMS. Overall, this study provides a new strategy for the development of efficient photocatalytic activation of PMS for rapid degradation of organic pollutants.

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利用掺 Co 的 g-C3N4 复合材料改进 PMS 的光催化活化，有效降解四环素：催化剂性能、光生载流子转移和降解机制

基于二氧化硫的光催化耦合高级氧化工艺（SR-AOPs）被认为是一种降解污染物的先进废水处理技术。在这项工作中，成功设计了掺钴 g-C3N4 (CCN) 光催化剂，用于在可见光下活化过硫酸盐 (PMS)，从而高效降解四环素 (TC)。CCN 光催化剂表现出更高的降解效率，在 20 分钟内可去除 95.9% 的四环素，其降解速率常数（0.1354 min-1）远高于光催化系统（0.0090 min-1）和 SR-AOPs 系统（0.0538 min-1）。在表面光电压和光致发光等测量手段的帮助下，对光生载流子的分离和传输特性进行了探测。结果表明，Co 的引入促进了 CCN 中光生电荷的有效分离，加速了 Co3+/2+ 循环，实现了 PMS 的高效活化。总之，该研究为开发高效光催化活化 PMS 快速降解有机污染物提供了一种新策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.