Abstract

Herein, zinc tungstate coupled fluorinated titanium dioxide (ZnWO₄/F–TiO₂) composites were synthesized by microemulsion hydrothermal process with cetyltrimethylammonium bromide/n-hexanol/deionized water/cyclohexane as microemulsion, butyl titanate as titanium source and ammonium fluoride as fluorine source. Methyl orange was used as the target pollutant in sewage to explore the photodegradation performance and recycling performance of the as-prepared specimens. Effect of coupling ratios on the photocatalytic performance was studied. SEM, XRD, UV–Vis Abs, FTIR, BET, and XPS were used to characterize the samples, the performances of photocurrent (i–t) and electrochemical impedance spectroscopy (EIS) were also investigated and the modification mechanism was systematically studied. The results showed that the optimal loading amount of ZnWO₄ was 1 wt %. Under the same conditions, after illumination for 30 min with metal halide, the degradation rates of methyl orange by single TiO₂, F–TiO₂, and 1% ZnWO₄/F–TiO₂ reached 54.5, 84, and 93.5% respectively. 1% ZnWO₄/F–TiO₂ showed an enhanced photocatalytic activity and excellent cycle stability due to the formation of heterostructures which significantly inhibited the recombination of photogenerated electrons and holes.

中文翻译：

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具有增强光催化活性的钨酸锌偶联氟化二氧化钛 (ZnWO4/F–TiO2) 复合材料

摘要

以十六烷基三甲基溴化铵/正己醇/去离子水/环己烷为微乳液，钛酸丁酯为钛源，氟化铵为氟源，采用微乳液水热法合成了钨酸锌偶联氟化二氧化钛（ZnWO ₄ / F- _TiO 2 ）复合材料。 。以污水中的甲基橙为目标污染物，探讨所制备样品的光降解性能和回收性能。研究了偶联比对光催化性能的影响。采用SEM、XRD、UV-Vis Abs、FTIR、BET和XPS对样品进行了表征，并研究了光电流（i - t）和电化学阻抗谱（EIS）的性能，并对改性机理进行了系统研究。结果表明,ZnWO ₄的最佳负载量为1 wt%。相同条件下，金属卤化物照射30 min后，单一TiO ₂、F-TiO ₂和1%ZnWO ₄ /F-TiO ₂对甲基橙的降解率分别达到54.5%、84%和93.5%。 1% ZnWO ₄ /F-TiO ₂由于异质结构的形成显着抑制光生电子和空穴的复合而表现出增强的光催化活性和优异的循环稳定性。