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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (4): 1433-1444.DOI: 10.16552/j.cnki.issn1001-1625.2025.1017

• 功能材料 • 上一篇    下一篇

分散剂对溶胶-凝胶法制备La(TiMnCoNiCu)O3高熵氧化物可见光催化活性的影响

祁志宏1,2,3(), 李恪1,2,3, 沈宏芳1,2,3(), 马聪聪1,2,3, 马慧1,2,3   

  1. 1.北方民族大学材料科学与工程学院,银川 750021
    2.碳基先进陶瓷制备技术国家地方联合工程研究中心,银川 750021
    3.粉体材料与特种陶瓷省部共建重点实验室,银川 750021
  • 收稿日期:2025-10-20 修订日期:2025-12-31 出版日期:2026-04-20 发布日期:2026-05-14
  • 通信作者: 沈宏芳,博士,副教授。E-mail:shen_hongfang@nun.edu.cn
  • 作者简介:祁志宏(1999—),男,硕士研究生。主要从事功能纳米粉体的制备及在光催化方面的应用研究。E-mail:1907149172@qq.com
  • 基金资助:
    宁夏自然科学基金(2025AAC030046);北方民族大学研究生创新创业训练计划(YCX24303);宁夏回族自治区区级大学生创新创业训练计划(S202411407010)

Effects of Dispersants on Visible-Light Photocatalytic Activity of Sol-Gel-Derived La(TiMnCoNiCu)O3 High-Entropy Oxides

QI Zhihong1,2,3(), LI Ke1,2,3, SHEN Hongfang1,2,3(), MA Congcong1,2,3, MA Hui1,2,3   

  1. 1.School of Materials Science & Engineering,North Minzu University,Yinchuan 750021,China
    2.National and Local Joint Engineering Research Center of Advanced Carbon-Based Ceramics Preparation Technology,Yinchuan 750021,China
    3.Key Lab of Powder Materials & Advance Ceramics,Yinchuan 750021,China
  • Received:2025-10-20 Revised:2025-12-31 Published:2026-04-20 Online:2026-05-14

摘要:

钙钛矿型高熵氧化物因独特的结构而对部分抗生素有显著的降解效果,目前有关分散剂用量对溶胶-凝胶法制备的钙钛矿型高熵氧化物催化性能影响方面的研究较为匮乏。本研究采用溶胶-凝胶法在850 ℃煅烧合成了具有n型半导体特性的La(TiMnCoNiCu)O3(LTMCNCO)纳米颗粒,并系统研究了分散剂乙二醇用量对LTMCNCO纳米颗粒性能的影响。结果表明:金属离子与乙二醇的摩尔比为1∶2时,LTMCNCO纳米颗粒表现出优异的电化学性能,瞬时光电流密度为3.95 μΑ·cm-2,平带电位和带隙分别为-0.539 eV和1.12 eV,导带和价带能量分别为-0.539和+0.581 eV;在可见光驱动下,光反应150 min后,LTMCNCO纳米颗粒对10 mg/L的左氧氟沙星(AHS)、环丙沙星(CIP)和盐酸四环素(Tc-HCl)的最大降解率分别达到20.2%、50.4%和79.9%;自由基捕获实验表明,LTMCNCO纳米颗粒的光催化活性主要是由羟基自由基(·OH)、超氧自由基(·O2-)和空穴(h+)引起的。LTMCNCO纳米颗粒的窄带隙特性和高熵晶格畸变效应增加了其表面活性位点密度,从而显著提高了污染物的光催化降解效率。

关键词: La(TiMnCoNiCu)O3, 高熵氧化物, 分散剂, 可见光催化, 抗生素降解

Abstract:

Perovskite-type high-entropy oxides (HEPs) have significant degradation effects on some antibiotics due to their unique structure. Currently, there is a lack of research on the effects of dispersants dosages on the photocatalytic performance of HEPs prepared via sol-gel method. In this paper, La(TiMnCoNiCu)O3 (LTMCNCO) nanoparticles with n-type semiconductor properties were synthesized by calcination at 850 ℃ by sol-gel method. The effect of dispersant ethylene glycol dosage on the performance of LTMCNCO nanoparticles was systematically studied. The results show that when the mole ratio of metal ions to ethylene glycol is 1∶2, LTMCNCO nanoparticles exhibit excellent electrochemical performance. The instantaneous photocurrent density is 3.95 μA·cm-2, its flat band potential and band gap are -0.539 eV and 1.12 eV respectively, and the conduction band and valence band energies are -0.539 and +0.581 eV respectively. Under the driven of visible light, when the light reaction lasts for 150 min, the maximum photodegradation rates of LTMCNCO nanoparticles for 10 mg·L-1 levofloxacin (AHS), ciprofloxacin (CIP), and tetracycline hydrochloride (Tc-HCl) reach 20.2%, 50.4%, and 79.9%, respectively. The free radical capture experiments indicate that the photocatalytic activity of LTMCNCO nanoparticles is mainly caused by hydroxyl radicals (·OH), superoxide radicals (·O2-) and holes (h+). The narrow bandgap characteristics and lattice distortion effect of LTMCNCO nanoparticles increase the density of surface-active sites, thereby significantly improving the photocatalytic degradation efficiency of pollutants.

Key words: La(TiMnCoNiCu)O3, high-entropy oxide, dispersant, visible-light photocatalysis, antibiotic degradation

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