g-C3N4/MnCoNiCuCe(C)复合光催化剂的制备及其光催化降解性能研究

马博洋1,2,3, 郭瑞华1,2,3*, 徐嵩杭1, 乌仁托亚4, 安胜利1,2,3

化工新型材料 ›› 2026, Vol. 54 ›› Issue (5) : 205 -213.

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化工新型材料 ›› 2026, Vol. 54 ›› Issue (5) : 205-213. DOI: 10.19817/j.cnki.issn1006-3536.2026.05.018
科学研究

g-C3N4/MnCoNiCuCe(C)复合光催化剂的制备及其光催化降解性能研究

    马博洋1,2,3, 郭瑞华1,2,3*, 徐嵩杭1, 乌仁托亚4, 安胜利1,2,3
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g-C3N4/MnCoNiCuCe(C) composite photocatalyst:synthesis and photocatalytic degradation

  • Ma Boyang1,2,3, Guo Ruihua1,2,3, Xu Songhang1, Wuren Tuoya4, An Shengli1,2,3
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摘要

通过原位复合策略构建了稀土Ce掺杂的MnCoNiCuCe(C)/g-C3N4复合光催化剂,实现了四环素(TC)的高效降解。材料表征显示,MnCoNiCuCe(C)以单一面心立方(FCC)固溶体相均匀分散于g-C3N4三维多孔网络结构中,XPS证实界面间存在由g-C3N4向高熵合金的电子迁移。MnCoNiCuCe(C)与g-C3N4的最优复合质量比 1∶2光催化剂在可见光下对TC的降解效率达80.99%,其动力学速率常数(0.018min-1)分别为纯g-C3N4和高熵合金的9倍与3.6倍,且三次循环后降解性能稳定。能带分析表明,界面通过MnCoNiCuCe(C)的窄带隙(1.68eV)与 g-C3N4能级匹配促进光生载流子分离,荧光寿命从3.80ns增至4.16ns,证实电荷复合被有效抑制。Ce的变价特性协同三维多孔结构共同提升了光吸收、活性位点暴露及电子传输效率。该工作为稀土改性复合光催化剂的设计及水体抗生素治理提供了新思路。

Abstract

In this study,a rare earth Ce-doped MnCoNiCuCe(C)/g-C3N4 composite photocatalyst was fabricated via an in-situ compositing strategy,achieving efficient degradation of tetracycline (TC).Material characterization results demonstrated that MnCoNiCuCe(C) was uniformly dispersed within the three-dimensional porous network of g-C3N4,existing as a single face-centered cubic (FCC) solid-solution phase.X-ray photoelectron spectroscopy (XPS) analysis verified the occurrence of interfacial electron transfer from g-C3N4 to the high-entropy alloy.The photocatalyst with an optimal MnCoNiCuCe(C) to g-C3N4 mass ratio of 1∶2 achieved a TC degradation efficiency of 80.99% under visible light.Its kinetic rate constant (0.018min-1) was 9 times higher than that of pure g-C3N4 and 3.6 times higher than that of high-entropy alloy,and the composite demonstrated stable performance over three consecutive cycles.Bandgap analysis revealed that the interface promoted the separation of photogenerated carriers by facilitating energy level alignment between the narrow bandgap (1.68eV) of MnCoNiCuCe(C) and g-C3N4.The increase in fluorescence lifetime from 3.80ns to 4.16ns further evidenced the effective suppression of charge recombination.The variable valence characteristic of Ce,coupled with the three-dimensional porous architecture,synergistically enhanced light absorption capacity,active site accessibility,and electron transfer efficiency.This research offers novel perspectives on the design of rare earth-modified composite photocatalysts and provides viable strategies for the remediation of antibiotic-contaminated water.

关键词

光催化降解 / 高熵合金 / g-C3N4 / 降解四环素

Key words

photocatalytic degradation / high-entropy alloys / g-C3N4 / degradation of tetracycline

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g-C3N4/MnCoNiCuCe(C)复合光催化剂的制备及其光催化降解性能研究[J]. 化工新型材料, 2026, 54(5): 205-213 DOI:10.19817/j.cnki.issn1006-3536.2026.05.018

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