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以钨酸钠与氢氟酸为原料聚合得到氟取代的十聚钨酸(F-H_4W_(10)O_(32)),并采用FT-IR,UV-vis和~(19)F-NMR进行表征.由FT-IR和~(19)F-NMR的表征结果得出,F原子可能通过取代W-Oc-W键的侧桥氧原子而被结合到十聚钨酸盐的框架中,显著改善了十聚钨酸盐的稳定性及其对水溶液中H_2O_2的活化能力.在紫外光照射下催化过氧化氢(H_2O_2)氧化降解的甲基橙(MO)实验显示出氟取代的十聚钨酸出色的光催化活性,其与亲本H_4W_(10)O_(32)相比,降解速率增加到1.4~2.0倍.基于UV-Vis光谱表征,提出了一种合理的光催化氧化机理.
Fluoro-substituted deca-tungstic acid (F-H_4W_ (10) O_ (32)) was synthesized by the reaction of sodium tungstate and hydrofluoric acid. FT-IR, UV-vis and ~ (19) F- Characterization by FT-IR and ~ (19) F-NMR indicated that the F atom could be incorporated into the framework of the decattraungstate by replacing the side-bridge oxygen atom of the W-Oc-W bond, significantly The stability of decatungsticate and its activation ability to H 2 O 2 in aqueous solution were improved.Microscopic orange (MO) experiments catalyzing the oxidative degradation of hydrogen peroxide (H 2 O 2) under UV irradiation showed that fluorine-substituted decamethylene The photocatalytic activity was improved by 1.4-2.0 times compared with the parent H_4W_ (10) O_ (32) .According to the UV-Vis spectra, a reasonable photocatalytic oxidation mechanism was proposed.