改性金属有机框架光催化剂制备及水处理效能

Fabrication of Modified Metal Organic Framework Photocatalysts and Water Treatment Efficiency

摘要:

采用简单的多级搅拌方法，利用AgCl对金属有机框架（MOF）光催化剂（MIL-100（Fe））进行改性。利用X射线衍射仪（XRD）和傅里叶红外光谱仪（FT-IR）等表征手段，证明了新型异质结材料（AgCl/MIL-100（Fe））的成功制备。以磺胺假二嘧啶（SMZ）作为目标污染物，考察了催化剂投量、污染物浓度和pH等因素对光催化去除效果的影响，并初步探讨了SMZ的降解机理和路径。结果表明，异质结的成功构建更合理的利用了光生电子（e^-）和空穴（h⁺），加速了界面处载流子的传递，提高了材料的光催化性能。当pH = 7，催化剂投加量为0.5 g·L^-1，反应时间为1.5 h，1.0 mg·L^-1的SMZ去除率达到99.9%。在SMZ的光催化降解过程中，超氧自由基（?O₂^-）、羟基自由基（?OH）和h⁺起主要作用，主要有氧化、羟基化和脱硝3种方式。

Abstract:

A simple multistage stirring methods was utilized to modifications of Metal organic framework （MOF） catalyst （MIL-100（Fe）） （incorporation of AgCl）. Characterization techniques such as X-ray diffraction （XRD） and Fourier-transform infrared spectroscopy （FT-IR） were employed to confirm the successful preparation of the novel heterojunction material （AgCl/MIL-100（Fe））. Sulfamethazine （SMZ） was chosen as the targeted contaminant. The removal efficiency of SMZ by the photocatalyst was investigated， considering factors such as catalyst dosage， pollutant concentration， and pH. Furthermore， an initial exploration of the degradation mechanism and pathway of SMZ was conducted. The results demonstrated that the rational construction of the heterojunction effectively harnesses photo-electrons （e^-） and holes （h⁺）， accelerating the transfer of charge carriers at the interface， thereby enhancing the photocatalytic performance of the material. When pH = 7， catalyst dosage was 0.5 g·L^-1， reaction time was 1.5 h， the removal rate of 99.9% for an initial SMZ concentration of 1.0 mg·L^-1. During the photocatalytic degradation of SMZ， superoxide radicals （?O₂^-）， hydroxyl radicals （?OH）， and h⁺ play dominant roles， involving three main ways： oxidation， hydroxylation， and denitrification.