【摘要】 在光催化反应器中,紫外灯为光源,以α-Fe2O3/SA薄膜(海藻酸钠简记为SA)为例进行亚甲基蓝溶液的降解研究,考察了催化剂用量、溶液的pH值、亚甲基蓝的初始质量浓度及添加少量的H2O2对亚甲基蓝的降解率的影响,进一步探讨了亚甲基蓝的降解机理.结果表明,单一材料中,电子在光催化作用下由亚甲基蓝的中间态D*转移到激发态D+,从而再转移到α-Fe2O3和TiO2导带上;复合材料α-Fe2O3-TiO2/SA对亚甲基蓝的降解为光电催化氧化机制.更多还原

【Abstract】 The detail quantitive examination was carried out to investigate the photocatalytic degradation effect of methylene blue in violet irradiation with α-Fe2O3 catalysts.The experiment results demonstrated that photocatalysis lead to a charge transfer with the concomitant quenching of the transitional state for methylene blue and the formation of the excited state for methylene blue,then on thermodynamic grounds,charge transfered from methylene blue in the excited state to the conduction band of α-Fe2O3 and TiO2.The degradation of methelene blue with a novel multiple-semiconductor α-Fe2O3-TiO2/SA was photo-electro-catalytic-oxidative mechanism.更多还原