α-Fe_2O_3/ZnFe_2O_4复合粉体制备及其光催化降解亚甲基蓝

Preparation of α-Fe_2O_3/ZnFe_2O_4 Composite Powder and Its Photocatalytic Degradation to Methylene Blue

采用共沉淀-焙烧法制备了不同α-Fe_2O_3/Zn Fe_2O_4摩尔比的α-Fe_2O_3/Zn Fe_2O_4异质结复合粉体,考察了组分比对其光催化降解10 mg/L亚甲基蓝溶液活性的影响.结果表明,与单相α-Fe2O3或Zn Fe2O4相比,复合材料的光催化活性显著提高,α-Fe_2O_3/Zn Fe_2O_4摩尔比1:1时光催化性能最佳,光学带隙为1.94 e V,对太阳光谱的利用率约为41%,210 min内对亚甲基蓝溶液的降解率达99.65%.

A series of α-Fe2O3/ZnFe2O4 heterojunction photocatalysts with different molar ratios of α-Fe2O3 to ZnFe2O4 were prepared by a simple precipitation-calcination method. The effect of component ratio on photocatalytic activity of α-FeEO3/ZnFe2O4 was evaluated through the degradation of methylene blue （MB） solution （10 mg/L） under irradiation of a xenon lamp （300 W）. The results indicated that the α-Fe2O3/ZnFe2O4 exhibited an enhanced photocatalytic activity than either the single-phase α-Fe2O3 or ZnFe2O4. The α-Fe2O3/ZnFe2O4 with a molar ratio of α-Fe2O3 to ZnFe2O4 1：1 had an optical band gap of 1.94 eV, which can make use of approximately 41% of the solar spectrum. It delivered the beat photocatalytic activity among the tested component ratios, and its photodegradation rate of MB reached to 99.65% under the irradiation of the xenon lamp within 210 min.