α-Fe_2O_3-TiO_2复合晶膜的制备及光催化特性的研究

Preparation of α- Fe_2O_3 - TiO_2 on Glass Substrates and its Photo-Catalyst Properties

α-Fe2O3和TiO2均为n型半导体,在紫外光照射下可使亚甲基蓝发生氧化还原反应,使之降解.α-Fe2O3禁带宽度(2.2eV)比TiO2的禁带宽度(3.1eV)小,而其吸收光子的效率大于TiO2,在催化降解亚甲基蓝时表现出比TiO2更高的活性.α-Fe2O3-TiO2复合晶体的光吸收强度要比单一α-Fe2O3晶体的光吸收强度明显增强.在α-Fe2O3中掺入少量TiO2后,在紫外光照射下对亚甲基蓝的降解显示出更高的活性.

Both αFe2O3 and TiO2 are ntype semiconductor, but the band gap of αFe2O3(2.2 eV) is smaller than TiO2(3.1 eV).The αFe2O3 possesses a stronger ability of photon acceptance in visible region and higher photoelectrocatalytic activities. The results of voltammetry test indicated the photoelectronic current of αFe2O3\|TiO2 should be enhanced significantly. The methylene blue will be degraded and decolorized by UV irradiation on the glass substrates coated with nanoαFe2O3 TiO2 crystal.