中文摘要：

以漂珠为载体,用壳聚糖对漂珠进行改性,并采用溶胶凝胶法,制备了Fe-N共掺杂改性TiO2的漂浮型可见光催化剂（Fe-N-TiO2/FP-CTS）,使用X射线衍射（XRD）、紫外可见分光光谱（UV-Vis）、N2吸附-脱附（BET）和扫描电子显微镜（SEM）等分析进行表征。研究结果表明,用壳聚糖改性漂珠可以增加复合光催化剂的比表面积和孔容;相较于N-掺杂TiO2/FP复合光催化剂,Fe-N共掺杂更能促进对复合光催化剂可见光的吸收;光催化4 h后,Fe-N-TiO2/FP-CTS对溶解性柴油的降解率达到61.7%,明显优于Fe-N-TiO2/FP和N-TiO2/FP。当初始pH=5,柴油乳化剂浓度=120 mg/L时,复合光催化剂对溶解性柴油的光催化降解效果最佳。

英文摘要：

Floating photocatalysts of iron-nitrogen codoped TiO2 grafted on floating pearls（ Fe-N-TiO2/ FPCTS） were prepared by sol-gel method. Floating pearls were modificated by chitosan. The photocatalysts were characterized by X-ray diffraction（ XRD）,UV-vis diffuse reflectance spectroscopy（ UV-Vis）,N2adsorption-desorption（ BET） and scanning electron microscope（ SEM）. The results showed that by modifying chitosan in floating pearls,Fe-N-TiO2/ FP-CTS had higher BET surface area and porosity. Compared with N-TiO2/ FP,Fe-NTiO2/ FP and Fe-N-TiO2/ FP-CTS exhibited that the absorption intensity of visible region increased obviously.The enhanced dissolved diesel oil photodegradation rate of Fe-N-TiO2/ FP-CTS can reach 61. 7% after 4 hours under the visible light irradiation,which was much better than Fe-N-TiO2/ FP and N-TiO2/ FP. The photocatalysts exhibited the best photocatalytic activity for dissolved diesel oil at initial pH of 5 and the emulsifier concentration of 120 mg/L.