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以漂珠为载体通过简单的溶胶凝胶法,制备漂浮型可见光催化剂Fe-N-TiO_2/FP,并采用了X射线衍射(XRD)、N_2吸附-脱附测试(BET)、紫外-可见漫反射吸收光谱(UV-Vis)和扫描电子显微镜(SEM)等分析方法对样品的微观结构进行表征。研究表明,Fe掺杂可以有效地增加Fe-N-TiO_2/FP光催化剂中的比表面积和总孔容。相比N-TiO_2/FP,Fe-N-TiO_2/FP表现出其吸收带边有明显的红移在可见光区的吸收强度亦有明显的增大。可见光降解罗丹明B(RhB)的实验中,经过4 h可见光照射后,Fe_(0.71)-N-TiO_2/FP复合光催化剂对污染物的去除率可高达88.8%。不同pH条件下的降解实验表明,偏酸的环境更有利于RhB去除效率的提高。罗丹明B浓度的提高一定程度上阻碍了可见光的射入,也不利用罗丹明B的进一步吸附。漂浮型光催化材料在经过3次重复利用后,仍然具有较高的去除效率。
The floating type visible light photocatalyst Fe-N-TiO 2 / FP was prepared by sol-gel method using simple sol-gel method. X-ray diffraction (XRD), N 2 adsorption-desorption test (BET), UV- The microstructure of the samples was characterized by UV-Vis absorption spectroscopy and scanning electron microscopy (SEM). The results show that Fe doping can effectively increase the specific surface area and total pore volume in the Fe-N-TiO 2 / FP photocatalyst. Compared with N-TiO 2 / FP, Fe-N-TiO 2 / FP showed a significant red shift in the absorption band and a significant increase in the absorption intensity in the visible region. Visible light degradation Rhodamine B (RhB) experiments, after 4 h visible light irradiation, the Fe 0.71 -N-TiO 2 / FP composite photocatalyst removal of pollutants up to 88.8%. Degradation experiments under different pH conditions showed that the partial acidic environment is more conducive to the improvement of RhB removal efficiency. The increase of rhodamine B concentration hinders the injection of visible light to a certain extent and does not utilize the further adsorption of rhodamine B. The floating photocatalytic material still has high removal efficiency after three times of reuse.