镧掺杂纳米二氧化钛的可见光光催化性能研究

Study on the photo-catalytic activity of nano-TiO_2 doped with La under visible irradiation

采用经La2O3掺杂后的纳米TiO2粉末作为光催化剂,以300 W卤钨灯作为可见光光源,对水中的苯酚进行光催化降解,考察了La2O3不同的掺杂量、焙烧温度、pH值以及催化剂用量等因素对降解率的影响。实验结果表明:在光照射3 h后,纳米TiO2粉末在La掺杂量为0.5%,焙烧温度为600℃,pH为5,催化剂用量为1 g/L时的光催化活性最高,苯酚的TOC去除率为42.7%。

The photo-catalyzed oxidization experiment on phenol was carried out by using La2 O3 doping in nano-TiO2 as catalysts under visible irradiation （λ 〉 420 nm）. The photo-catalytic activity in the degrada- phenol removal rate, such as different doping amounts of La, calcining temperature, pH value and catalyst amounts, were studied in the paper. The results indicated that under the conditions that the doping ratio of La in nano-TiO2 powders was 0.5% , the calcining temperature was 600 ℃ ,the pH value was 5 ,and the catalyst amount was 1 g/L, the photo-catalytic activity was the highest,and 42.7% of total organic carbon （TOC） on phenol could be removed.