Ag_(3)PO_(4)/MIL-125光催化剂的制备与四环素降解性能研究

Synthesis of Ag_(3)PO_(4)/MIL-125 photocatalyst and its performance in tetracycline degradation

通过将Ag_(3)PO_(4)颗粒原位沉积在圆饼状MIL-125的表面,成功制备了Ag_(3)PO_(4)/MIL-125系列光催化剂.分别采用XRD、SEM、紫外可见漫反射光谱测试了催化剂的晶相结构、形貌特征、光吸收性能.研究在模拟太阳光照射下,Ag_(3)PO_(4)沉积量不同时,Ag_(3)PO_(4)/MIL-125光催化剂降解四环素类抗生素的性能,并探究了pH和催化剂投加量对体系降解效果的影响.实验表明Ag_(3)PO_(4)的沉积有效提高了MIL-125的光催化性能,在pH=2,投加量为0.2 g/L,光照60 min后,Ag_(3)PO_(4)(20%)/MIL-125对四环素类抗生素的降解率可以达到94%.

The present study successfully prepared a series of Ag_(3)PO_(4)/MIL-125 photocatalysts through the in-situ deposition of Ag_(3)PO_(4)particles onto the surface of pristine MIL-125.The crystal phase structure,morphological characteristics,and light absorption properties of the catalysts were investigated using XRD,SEM,and UV-vis diffuse reflectance spectroscopy,respectively.The photocatalytic performance of the Ag_(3)PO_(4)/MIL-125 catalysts in degrading tetracyclines under simulated solar light irradiation was studied with varying amounts of Ag_(3)PO_(4)deposition,along with an exploration of the effects of pH and catalyst dosage on the degradation efficiency of the system.The results demonstrate that the deposition of Ag_(3)PO_(4)effectively enhances the photocatalytic performance of MIL-125.Specifically,at pH=2 and a dosage of 0.2 g/L,Ag_(3)PO_(4)(20%)/MIL-125 achieves a degradation rate of 94%for tetracyclines after 60 min of light exposure.