【摘要】 采用溶胶凝胶法制备了铁、氮共掺杂二氧化钛(Fe3+/N-TiO2)粉末,通过浸渍涂膜法将其负载到聚丙烯(PP)生物填料上,并考察了日光激发改性TiO2对微污染源水的处理效果。结果表明,铁、氮的掺杂大大提高了TiO2对太阳光的利用效率,当流量为0.12 m3/h时,负载型Fe3+/N-TiO2填料对CODMn和NH4+-N的去除率分别达到59%和75%。采用扫描电镜观察运行前后填料的表面状况,发现Fe3+/N-TiO2膜的保持程度较好,运行3个月后未发生明显脱落;膜表面生长了类似微生物的物质,可以推测在PP填料表面微生物与二氧化钛形成了功能分区,可以同时进行光化学氧化和生物降解作用。更多还原

【Abstract】 Fe3+/N-doped titanium dioxide(Fe3+/N-TiO2) nanopowder was prepared by the sol-gel method and coated by the dipping method on polypropylene bio-filling materials.This modified immobilized titanium dioxide was tested in the treatment of micro-polluted source water by solar photocatalysis.The results show that the titanium dioxide doped by Fe3+/N efficiently utilizes sunlight.When the flow rate is 0.12 m3/h,the degradation rates of CODMn and NH+4-N achieve 59% and 75% respectively.The surface of the filling materials was analyzed by SEM before and after operation for 3 months.The external Fe3+/N-TiO2 film is not brushed off,and microorganisms are found on its surface.Thus,it is concluded that photochemical oxidation and biodegradation can be performed simultaneously on the surface of the polypropylene bio-filling materials.更多还原