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Enhanced removal of tetracycline from water using MgO-modified g-C3N4 composite: Synthesis optimization and mechanism investigation

文献类型： 外文期刊

作者： Yu, Hui 1 ; Gao, Longfei 1 ; Zhang, Xinyuan 1 ; Zhang, Shuang 1 ; Chi, Wenshi 1 ; Zhang, Long 1 ; Li, Jianzhuo 1 ; Tian, Yushi 1 ; Cai, Hongguang 2 ; Zhang, Ying 1 ;

作者机构： 1.Northeast Agr Univ, Sch Resources & Environm, Harbin 150030, Peoples R China

2.Jilin Acad Agr Sci, Inst Agr Resource & Environm, Changchun 130033, Peoples R China

关键词： Heterojunction; Photocatalysis; Tetracycline degradation; Wastewater treatment

期刊名称：JOURNAL OF WATER PROCESS ENGINEERING （ 影响因子：6.7； 五年影响因子：6.7 ）

ISSN： 2214-7144

年卷期： 2025 年 71 卷

页码：

收录情况： SCI

摘要： Tetracycline(TC) is a typical pharmaceutical and personal care product (PPCP) that harms ecological health due to its impact on human allergic reactions, bacterial resistance, and environmental microbiota. Thus, developing environmentally friendly, efficient, and suitable methods to eliminate TC and inactivate bacteria in aquatic environments is becoming essential. A facile hydrothermal approach was developed to synthesize MgO-modified g-C3N4 composites for efficient TC removal from water. The as-prepared composites were thoroughly characterized by BET, SEM, XRD, and XPS analyses, confirming the successful incorporation of MgO into the g-C3N4 framework. Under optimal conditions (1:1 MgO/g-C3N4 ratio, 150 degrees C synthesis temperature), the composite achieved 84.89 % TC removal within 90 min under visible light, substantially outperforming pristine materials (MgO, g-C3N4). The composite maintained removal efficiency above 70 % after six successive cycles, demonstrating excellent stability. Mechanistic investigations identified O2 center dot- as the dominant reactive species, with h+ playing a secondary role. Analysis of atomic Fukui indices revealed preferential radical attack at C7, O20, and N24 sites, leading to TC degradation through hydroxylation and cyclization pathways. The composite showed promising performance in actual river water treatment, suggesting potential for practical applications. This work provides insights for developing efficient photocatalytic materials for pharmaceutical pollutant removal from water.

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