稀土金属Dy掺杂TiO_2光催化剂的制备及其对孔雀石绿降解性能的研究

Study on preparation of rare earth element dysprosium doped with TiO_2 photocatalyst and its degradation property to malachite green

采用稀土元素掺杂法制备改性的二氧化钛,以改善非均相光催化的氧化效率。研究结果表明,在掺杂镝元素之后,产物的吸收光谱发生了红移,在可见光作用下,可以有效地促进孔雀石绿的氧化脱色。引入掺杂型光催化剂Dy3+-Ti O2后,可降低光氧化体系所需的能量,提高光解效率。以孔雀石绿溶液作为模拟废水,考察了Dy3+离子掺杂量、底物浓度等因素的影响,确定了优化的实验条件:在孔雀石绿的浓度为20 mg/L,稀土元素Dy掺杂量为1.5%(摩尔比)时,反应150 min后孔雀石绿脱色率达到60%以上。

To improve the oxidation efficiency of heterogeneous photocatalysis,TiO2 doped by rare-earth elements was adopted. The results indicate that： there was red-shift adsorption spectra of synthetic product which could enhance malachite green oxidative decolorization effectively under the action of normal visible light. Due to Dy^3＋-TiO2 doped photocatalyst,activation energy of photooxidation was decreased so that the efficiency of photolysis could be improved significantly. What＇s more,the treatment of malachite green model wastewater with Dy^3＋-TiO2 was studied and optimal conditions has been determined as follows： the concentration of malachite green is 20 mg / L,molar ratio of Dy-doping is 1. 5%. Under that reaction condition,after 150 min,the decolorization rates of malachite green will be over 60%.