铋改性TiO_(2)光催化剂的制备及其光催化性能

Preparation and Photocatalytic Performance of Bismuth Modified TiO_(2) Photocatalyst

光催化剂是污水处理领域必不可少的光催化原料,为获得较高的降解效果,研究制备了铋改性TiO_(2)光催化剂(Bi-TiO_(2)光催化剂)并分析其光催化性能。分别制备铋基材料与TiO_(2)溶液,混合上述2种物质获得铋改性TiO_(2)光催化剂。以甲基橙作为试验模型溶液,测试铋基材料与TiO_(2)比例不同时该光催化剂的催化性能,以及不同温度条件、光照条件和光催化时长时的光催化性能变化情况,以验证甲基橙溶液浓度、pH值对于光催化效果的影响。实验结果显示,铋基材料与TiO_(2)的质量比为1∶1时,该光催化剂的降解效果与脱色效果最佳,具有良好光催化效果。Bi-TiO_(2)光催化剂展现出不同程度的甲基橙降解能力,其降解值随着铋基材料与TiO_(2)比例的变化呈现先增大后减小的趋势。温度为45℃,光照条件为15 h时,该催化剂光催化性能最佳,温度达到120℃以上时,光催化剂的光催化效果趋于稳定。甲基橙质量浓度为20 mg/L、pH值为4时,光催化性能更加理想。甲基橙质量浓度对Bi-TiO_(2)光催化剂的光催化性能影响较小,无论甲基橙溶液的质量浓度如何变化,光催化剂均能展现出较强的光催化效果,并且在甲基橙质量浓度为20 mg/L时表现出最佳脱色效果。pH值为4时,光催化剂展现出最高的甲基橙脱色率。由此可知,通过引入铋元素可以显著提高TiO_(2)的光催化性能和可见光响应能力。

In order to achieve higher degradation efficiency,it is indispensable to use photocatalysts in the field of wastewater treatment.Researching and preparing bismuth-modified TiO_(2) photocatalysts(Bi-TiO_(2) photocatalysts)and analyzing their photocatalytic performance are essential.Bismuth-based material and TiO_(2) solution were separately prepared,and by mixing the two substances,the bismuth-modified TiO_(2) photocatalyst was obtained.Using methyl orange as the test model solution,the catalytic performance of this photocatalyst at different ratios of bismuth-based material to TiO_(2),different temperature conditions,light conditions,and photocatalytic durations was tested to verify the impact of methyl orange solution concentration and pH value on the photocatalytic effect.Experimental results showed that when the mass ratio of bismuth-based material to TiO_(2) was 1∶1,the photocatalyst exhibited the best degradation and decolorization effects,demonstrating excellent photocatalytic performance.The Bi-TiO_(2) photocatalyst exhibited varying degrees of methyl orange degradation ability,with the degradation rate initially increasing and then decreasing with the change in the ratio of bismuth-based material to TiO_(2).The optimal photocatalytic performance of this catalyst was observed at a temperature of 45℃ and under 15 h of light exposure.When the temperature exceeded 120℃,the photocatalytic effect of the catalyst tended to stabilize.The photocatalytic performance was more ideal at a methyl orange mass concentration of 20 mg/L and a pH value of 4.Environmental concentration had minimal impact on the photocatalytic performance of the Bi-TiO_(2) photocatalyst.Regardless of the variation in methyl orange mass concentration,the catalyst exhibited strong photocatalytic effects,with the best decolorization effect observed at a methyl orange mass concentration of 20 mg/L.The catalyst showed the highest methyl orange decolorization rate at a pH value of 4.Therefore,it is evident that the introduction of bismuth significantly enhances the photocatalytic performance and visible light responsiveness of TiO_(2).