碳量子点修饰的低密度聚乙烯薄膜的制备及光催化性能研究

Preparation and Photocatalytic Performance of Low Density Polyethylene Film Modified with Carbon Quantum Dots

文章分别采用水热法制备碳量子点(CQDs)、沉淀法制备磷酸银(Ag_(3)PO_(4))和浇铸成型法制备得到低密度聚乙烯/磷酸银/碳量子点(LDPE/Ag_(3)PO_(4)/CQDs)复合材料,通过傅里叶变换红外光谱仪(FTIR)、透射电子显微镜(TEM)、氮气等温吸附(BET)和紫外可见漫反射光谱(UV-Vis DRS)等手段对复合材料进行表征,并考察其光催化降解四环素的性能。结果表明:Ag_(3)PO_(4)/CQDs粒子能够均匀分散在LDPE薄膜上,当Ag_(3)PO_(4)/CQDs的质量分数为20%时,光催化降解四环素的效果最佳。在350 W氙弧灯照射下,当溶液初始质量浓度为40 mg/L,pH值为7时,采用140 cm^(2)的LDPE/Ag_(3)PO_(4)/CQDs-2催化剂,溶液中四环素的降解率可达到63.91%。

Carbon quantum dots(CQDs)were prepared by hydrothermal method,silver phosphate(Ag_(3)PO_(4))was prepared by precipitation method,and low density polyethylene/silver phosphate/carbon quantum dots(LDPE/Ag_(3)PO_(4)/CQDs)composites were prepared by casting method.The composites were characterized by Fourier transform infrared spectroscopy(FTIR),transmission electron microscopy(TEM),nitrogen isothermal adsorption(BET)and ultravioletvisible diffuse reflectance spectroscopy(UV-Vis DRS).The photocatalytic degradation of tetracycline was investigated.The results show that Ag_(3)PO_(4)/CQDs particles can be uniformly dispersed on the LDPE film.When the mass fraction of Ag_(3)PO_(4)/CQDs is 20%,the photocatalytic degradation of tetracycline is the best.Under the irradiation of 350 W xenon arc lamp,when the initial mass concentration of the solution is 40 mg/L and the pH value is 7,the degradation rate of tetracycline in the solution can reach 63.91%with LDPE/Ag_(3)PO_(4)/CQDs-2 catalyst(140 cm^(2)).