配合法制备K_4Nb_6O_(17)及其光催化活性的研究

Preparation of K_4Nb_6O_(17) by citric-complex method and itsphotocatalytic activity for water splitting into hydrogen

通过配合法合成了铌酸盐K4Nb6O17,采用X-射线衍射、扫描电镜等对K4Nb6O17进行了结构和形貌表征.在I-为电子给体、RuO2为助催化剂的情况下,研究RuO2-K4Nb6O17在波长约为360 nm紫外辐射下分解水的产氢活性,讨论了制备温度和I-离子浓度对K4Nb6O17光催化分解水产氢活性的影响,且对配合法与高温固相法制得的K4Nb6O17进行了光催化性能的比较.研究发现,在I-浓度为15 mmol/L,pH=10以及波长约为360 nm紫外光照射条件下,配合法制备的RuO2负载量为0.5%的K4Nb6O17光催化产生氢气的最大速率为1 090μmol/(L.h).

The K4Nb6O17 photocatalyst for water splitting into H2 was prepared by the citriccomplex method and was characterized by powder X-ray diffraction and scanning electron microscope. The photocatalytic activity of K4Nb6O17 was studied with I^- as electron donor and RuO2 as promoter catalyst under 360 nm UV irradiation. The effect of sintering temperature and the concentration of I^- as electron donor on the photocatalytic activity of K4Nb6017 was also investigated. Comparison of the photocatalytic activity of K4Nb6O17 prepared by the citric-complex and solid-state reaction method was made. The maximum water splitting rate was 1 090 μmol/（L · h） when K4Nb6O17 prepared by citric-complex method wasused as photocatalyst （with 0.5% loaded RuO2） and I^- with a concentration of 15 mmol/L as electron donor at pH 10 under UV radiation.