贵金属负载型TiO_(2)光催化法处理含酚工业废水研究

Treatment of phenol containing industrial wastewater by noble metal supported TiO_(2) photocatalysis

以钛酸丁酯作为前驱体,采用溶胶凝胶法制备了纯TiO_(2),通过溶液静置法制备了不同质量分数的Ag/TiO_(2),通过XRD和TEM表征了催化剂物相结构和形貌特征。以苯酚为模拟污染物,研究了Ag负载量、光照强度、苯酚起始浓度以及催化剂重复使用性能。实验结果表明,Ag负载量为2%、光照强度为400W、废水样品中苯酚浓度小于400mg·L^(-1)时的催化降解效果最好,且催化剂在8次循环使用后催化活性仍保持较高水平。TEM和XRD表征分析发现,成功合成了TiO_(2)催化剂,Ag纳米粒子均匀分散在TiO_(2)表面。

In this paper,pure TiO_(2) was prepared by sol-gel method with butyl titanate as precursor,and Ag/TiO_(2) with different mass fractions were prepared by solution standing method.The phase structure and morphology of the catalyst were characterized by XRD and TEM.Using phenol as a simulated pollutant,the loading amount of Ag,light intensity,initial concentration of phenol,and catalyst reusability were studied.The experimental results showed that the catalytic degradation effect was best when the Ag loading amount was 2%,the light intensity was 400W,and the phenol concentration in the wastewater sample was less than 400mg·L^(-1).Moreover,the catalytic activity of the catalyst remained at a high level after 8 cycles of reuse.TEM and XRD characterization analysis found that TiO_(2) catalyst was successfully synthesized,and Ag nanoparticles were evenly dispersed on the surface of TiO_(2).