Fe/N共掺杂纳米TiO_2光催化降解室内甲醛的实验研究

The experimental research on the degradation of formaldehyde by photocatalysis of Fe/N co-doped TiO_2

采用溶胶—凝胶法制备了纯TiO2、Fe-TiO2、N-TiO2以及Fe-N-TiO2,并将其负载于瓷砖上,使用XRD和SEM技术对薄膜样品的晶型和表面形态进行表征,以甲醛为目标降解物,测试其光催化降解效果。结果表明,Fe-N-TiO2(500℃)光催化剂以锐钛矿结构为主,粒径分布均匀,平均粒径较小。共掺杂离子的掺杂量、掺杂配比和光催化剂的煅烧温度均影响纳米TiO2的光催化性能,当掺杂配比为n(Fe)∶n(N)∶n(TiO2)=0.1%∶1%∶1、煅烧温度为500℃时,Fe-N共掺杂样品对甲醛降解效率最高,在紫外光照射下Fe-N-TiO2在2 h内对甲醛的降解率达到53%,高于Fe-TiO2的45%、N-TiO2的43%和纯TiO2的25%。

TiO2,Fe-TiO2,N-TiO2,and Fe-N co-doped TiO2 were prepared by were prepared by sol-gel method,and then loaded on the faces of enamel tiles,the surface morpho-logies and crystalline properties were characterized by X-ray diffraction（XRD） and Scanning electron microscope（SEM）,and its photocatalysis properties were studied by photocatalytical degradation of formaldehyde.The results indicated,the prepared co-doped TiO2 was mostly presented to be anatase,the diameter of particals were pretty small and well-distributed.The photocatalytic activity of the co-doped TiO2 is mainly affected by factors such as doping content、doping ratio and calcinate temperature.When the co-doping amount（in molar ratio） for Fe-N is n（Fe）∶n（N）∶n（TiO2）=0.1%∶1%∶1 and the temperature of heat treatment is 500℃,in 2 hours and under UV light,Fe-N-TiO2＇s degradation efficiency to formaldehyde is 53%,higher than Fe-TiO2＇s 45%、N-TiO2＇s 43% and much higher than pure TiO2＇s 25%.