MOFs衍生CuO/ZnO催化剂的制备及其光催化性能的研究

利用Cu₃(BTC)₂为材料模板制备金属氧化物CuO,通过光沉积引入Zn2+煅烧合成双金属氧化物催化剂CuO/ZnO,研究了该催化剂在可见光条件下对罗丹明B的光催化降解性能,确定了罗丹明B在降解过程中的主要活性物种,并利用液相原位红外技术探究其降解机理。结果表明:MOFs衍生物CuO/ZnO催化剂具有优良的光催化降解能力,可见光响应150 min后,对10 mg/L罗丹明B的降解率最高达到67.56%以上,其中发挥主要作用的活性物种是超氧自由基·O₂-;经过5次循环实验后降解率仍在50%以上,证明该材料具有较好的可重复利用性。通过液相原位红外光谱检测,分析推断罗丹明B分子在降解过程中存在乙基、羧基和苯环芳香环结构的破坏以及氨基副产物的释放过程。该研究结果可为高效光催化体系的开发及污染物降解机理的研究提供参考。

PREPARATION OF CuO/ZnO CATALYST DERIVED FROM MOFs AND PHOTOCATALYTIC PERFORMANCE

In view of the different coordination modes of different metal ions, it is difficult to synthesize bimetallic organic framework (MOFs) materials, and obtain bimetal oxides by directly calcining MOFs. In this paper, Cu₃(BTC)₂ was used as a material template to prepare metal oxide CuO, and Zn2+ calcination was introduced by light deposition to synthesize a bimetal oxide catalyst CuO/ZnO. And then the photocatalytic degradation performance for rhodamine B (RhB) was studied under visible light condition. The main active species of the rhodamine B was determined in the degradation process. The degradation mechanism of dyes was investigated by liquid phase in-situ infrared technology. The result showed the MOFs derivative CuO/ZnO catalyst had an excellent photocatalytic degradation ability. The degradation efficiency of 10 mg/L rhodamine B reached 67.56% above after 150 min of visible light response. Among them, superoxide radical·O₂- played a major role. After 5 cycles, the degradation rate was still above 50%, which proved that the material had good reusability. A method of liquid phase in-situ infrared technology was established. The analysis result inferred that, during the degradation process, the destruction of the ethyl, carboxyl and benzene ring aromatic ring structure took place on the rhodamine B molecule, as well as the release of the amino by-products. The research results provide references for the development of high-efficiency photocatalytic system and researches on pollutant degradation mechanism.