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以Bi(NO_3)_3·5H_2O和Sr(NO_3)_2为原料,采用溶胶-凝胶法合成了Sr_6Bi_2O_9光催化剂。使用X射线衍射(XRD)、紫外-可见光漫反射(UV-Vis DRS)和傅里叶红外光谱(FT-IR)等对Sr_6Bi_2O_9催化剂的结构进行了表征。Sr_6Bi_2O_9样品的光催化性能是通过在可见光下(λ≥400nm)光催化降解直接耐酸大红(4BS)溶液来评估。实验结果表明,经过800℃焙烧处理的Sr_6Bi_2O_9光催化剂对模拟印染废水4BS显示出优异的降解性能,60min内对4BS的去除率高达98%。此外,研究了反应条件如有机物初始浓度、Sr_6Bi_2O_9投加量、溶液pH值对催化剂的光催化活性的影响。并进一步通过紫外-可见光谱分析结果验证了光催化剂对4BS的降解机理。
Sr_6Bi_2O_9 photocatalyst was synthesized by sol-gel method using Bi (NO_3) _3 · 5H_2O and Sr (NO_3) _2 as raw materials. The structure of Sr_6Bi_2O_9 was characterized by X-ray diffraction (XRD), UV-Vis DRS and Fourier transform infrared spectroscopy (FT-IR). The photocatalytic activity of Sr_6Bi_2O_9 samples was evaluated by photocatalytic degradation of direct acid red (4BS) solution under visible light (λ≥400nm). The experimental results show that the SrBi_2O_9 photocatalyst calcined at 800 ℃ shows excellent degradation performance for 4BS of simulated printing and dyeing wastewater, and the removal rate of 4BS is as high as 98% within 60min. In addition, the reaction conditions such as the initial concentration of organic matter, Sr_6Bi_2O_9 dosage, pH value of the solution on the photocatalytic activity of the catalyst. The degradation mechanism of 4BS by photocatalyst was further verified by ultraviolet-visible spectroscopy.