漂浮型B、N共掺杂TiO_2光催化剂的制备及柴油降解性能

Preparation of B-N co-doped TiO_2 floating photocatalyst for degradation of diesel oil

以膨胀珍珠岩为载体,采用溶胶-凝胶法制备硼、氮共掺杂漂浮型Ti O_2,采用XRD、BET、SEM、UV-vis DRS、XPS等分析手段进行材料表征并考察其对柴油的光降解性能.结果表明,B-N-Ti O_2/EP复合光催化剂表面有明显的Ti O_2覆层,晶型为锐钛矿型Ti O_2,Ti O_2负载有利于比表面积的提升.制得的B-N-Ti O_2/EP的可见光区响应高于N-Ti O_2/EP和Ti O_2/EP,该结果与3种材料的柴油光降解效果相一致.B-N-Ti O_2/EP对柴油的9h降解率将近50%,GC-MS分析表明,光降解过程中柴油各特征组分（C_9~C_（23））均得到不同程度降解,其中C_（11）以下的短链有机分子降解效果明显.

Floating boron-nitrogen codoped TiO2 grafted on expanded perlite （B-N-TiO2/EP） photocatalysts were prepared by a facile sol-gel method. The catalysts were characterized by XRD, BET, SEM, UV-vis-DRS and XPS. Furthermore, photodegradation of diesel oil was investigated to evaluate photocatalytic activities of B-N-TiO2/EP. The TiO2 layer whose patterns were identified as anatase were clearly observed on the surface of EP. The immobilization of TiO2 could greatly improve the BET surface area of EP. Compared with that of N-TiO2/EP and TiO2/EP, the absorption band edge of B-N-TiO2/EP exhibits an evident red-shift and the absorption intensity of visible region increases obviously. This result is in accord with their photodegradation efficiency of diesel oil. The 9h photodegradation rate of diesel oil for B-N-TiO2/EP was nearly 50%. The GC-MS results showed all the diesel oil components （C9~C23） could be degraded and short-chain organic molecules （〈C11） were more easily photodegraded.