多元改性二氧化钛的制备及其性能研究

采用浸渍法制备了铁-钐-镱-二氧化钛改性光催化剂，以苯酚为目标降解物，讨论了影响光催化剂性能的因素和提高光催化剂性能的方法。通过FE-SEM、XRD、UV-Vis等表征手段初步探讨了共掺杂提高二氧化钛光催化活性的机理。实验结果表明：常温、常压下，质量浓度为20 mg/L的苯酚废水（pH=7），当催化剂加入量为 2.5 g/L、焙烧温度为550 ℃、金属（铁、钐、镱）掺杂量各为0.5%（质量分数）时，经4 h紫外光照其对苯酚的去除率可达90%以上。改性后的二氧化钛光催化剂在可见光下也能够显示出很好的活性。

Study on preparation of multi-element modified titanium dioxide and performances thereof

Fe-Sm-Yb-TiO₂ photocatalysts were synthesized by immersion method.With phenol as degradation target，the influencing factors of catalyst performance and the methods of improving the performance of catalyst were discussed.A preliminary discussion about the mechanism of co-doping improving photocatalytic activity of TiO₂ was also made by means of FE-SEM，XRD，and UV-Vis etc..Experiments showed that the most suitable conditions were as follow：when the mass concentration of phenol wastewater was 20 mg/L（normal temperature and pressure），the pH was 7，the dosage of catalyst was 2.5 g/L， the calcining temperature was 550 ℃，and the doping rate of Fe，Sm，and Yb were all 0.5%（mass fraction），the degradation rate was up to 90% under the UV light for 4 h.The modified titanium dioxide catalyst also demonstrated fine activity under the visible light.