C-O官能团修饰的CaMoO4光催化剂的合成与光催化活性研究

doi:10.3969/j.issn.2097-2806.2024.06.007

摘要/Abstract

摘要：

采用溶胶凝胶法制备了对盐酸金霉素具有高效降解活性的CaMoO₄光催化剂。通过多种表征手段，研究了CaMoO₄光催化剂的相结构、纯度、官能团、表面形貌、光学性质和光催化活性。结果表明，CaMoO₄光催化剂为四方相，其样品中存在少量的C-O官能团；颗粒近似呈球形，由大颗粒和细颗粒组成；其具有高的可见光响应能力，光学带隙值为3.21 eV。以盐酸金霉素为目标降解物，在不同的药品质量浓度、催化剂含量、pH值条件研究了CaMoO₄光催化剂降解盐酸金霉素的光催化活性。结果表明，盐酸金霉素质量浓度为200 mg/L、催化剂含量1 g/L和pH值为7时，CaMoO₄光催化剂的降解百分比达到了94%。结合实验结果和能带理论，提出了CaMoO₄光催化剂降解盐酸金霉素的光催化机理。机理研究表明，C-O官能团在反应过程中为电子提供额外的能量使其跃迁到CaMoO₄光催化剂的导带，促进电子空穴对的产生；空穴、羟基自由基和超氧自由基是促进盐酸金霉素降解的关键因素。

关键词: 溶胶凝胶法, 钼酸钙, 光催化机理, 导带, 自由基

Abstract:

A CaMoO₄ photocatalyst with high activity for degradation of aureomycin hydrochloride was prepared by sol-gel method. The phase structure, purity, functional group, surface morphology, optical properties and photocatalytic activity of the CaMoO₄ photocatalyst were investigated by various characterization methods. The results showed that the CaMoO₄ photocatalyst was tetragonal phase, and a small amount of C-O functional groups were present in the sample. The particles were approximately spherical, which consisted of large particles and fine particles. It had high visible-light response with an optical band gap value of 3.21 eV. The photocatalytic activity of CaMoO₄ photocatalyst was studied at different drug concentrations, catalyst dosages and pH values using aureomycin hydrochloride as the target for degradation. The results showed that the degradation percentage reached 94% at the drug mass concentration of 200 mg/L, photocatalyst dosage of 1 g/L and pH of 7. The photocatalytic mechanism of the CaMoO₄ photocatalyst was proposed based on experimental results and band theory. The mechanism study showed that the C-O functional groups provided extra energy for electron transition to the conduction band of the CaMoO₄ photocatalyst and promoted the generation of electron hole pairs. Holes, hydroxyl radicals and superoxide radicals were the key factors to promote the degradation of aureomycin hydrochloride.

Key words: sol-gel method, CaMoO₄, photocatalytic mechanism, conduction band, free radical

中图分类号:

O469

汪磊, 田君. C-O官能团修饰的CaMoO₄光催化剂的合成与光催化活性研究[J]. 日用化学工业（中英文）, 2024, 54(6): 669-676.

Lei Wang, Jun Tian. Synthesis and photocatalytic activity of a CaMoO₄ photocatalyst modified with C-O functional groups[J]. China Surfactant Detergent & Cosmetics, 2024, 54(6): 669-676.

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C-O官能团修饰的CaMoO₄光催化剂的合成与光催化活性研究

Synthesis and photocatalytic activity of a CaMoO₄ photocatalyst modified with C-O functional groups

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