杜意恩, 牛宪军, 霍震, 苗玉茹. 不同晶面暴露的WO3纳米材料的制备及光催化性能[J]. 云南大学学报(自然科学版), 2022, 44(6): 1218-1226. doi: 10.7540/j.ynu.20210517
引用本文: 杜意恩, 牛宪军, 霍震, 苗玉茹. 不同晶面暴露的WO3纳米材料的制备及光催化性能[J]. 云南大学学报(自然科学版), 2022, 44(6): 1218-1226. doi: 10.7540/j.ynu.20210517
DU Yi-en, NIU Xian-jun, HUO Zhen, MIAO Yu-ru. On synthesis and photocatalytic performance of WO3 nanomaterials with different exposed crystal facets[J]. Journal of Yunnan University: Natural Sciences Edition, 2022, 44(6): 1218-1226. DOI: 10.7540/j.ynu.20210517
Citation: DU Yi-en, NIU Xian-jun, HUO Zhen, MIAO Yu-ru. On synthesis and photocatalytic performance of WO3 nanomaterials with different exposed crystal facets[J]. Journal of Yunnan University: Natural Sciences Edition, 2022, 44(6): 1218-1226. DOI: 10.7540/j.ynu.20210517

不同晶面暴露的WO3纳米材料的制备及光催化性能

On synthesis and photocatalytic performance of WO3 nanomaterials with different exposed crystal facets

  • 摘要: 以Na2WO4·2H2O为钨源,分别以乙酸、过氧化氢、氢氟酸和氟化铵为形貌控制剂,采用水热合成法制备了020/002晶面(HF−WO3)、110/002晶面(HAc−WO3、H2O2−WO3)、200/002/020晶面(NH4F−WO3)暴露的4种WO3纳米材料. 通过X射线粉末衍射(XRD)、场发射扫描电镜(FESEM)、透射电镜(TEM)、光致发光光谱(PL)、电化学阻抗谱(EIS)等对产物的晶体结构、形貌、光学性质及载流子的迁移和重组进行了表征. 研究了从Na2WO4到产物WO3的转变生成机理,并通过对硝基苯酚溶液在紫外线光照下的降解实验,对其光催化性能进行评价. 结果表明,200/002/020晶面共暴露的NH4F−WO3样品在光催化降解对硝基苯酚溶液中显示了最好的光催化性能.

     

    Abstract: In this paper, four kinds of WO3 nanomaterials with exposed 020/002 facets (HF−WO3), 110/002 facets (HAc−WO3, H2O2−WO3) and 200/002/020 facets (NH4F−WO3) were hydrothermal synthesized by using Na2WO4·2H2O as tungsten source, and acetic acid, hydrogen peroxide, hydrofluoric acid and ammonium fluoride as the morphology control agents, respectively. The crystal structure, morphology, optical properties, carrier migration and recombination of the prepared products were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), photoluminescence spectroscopy (PL) and electrochemical impedance spectroscopy (EIS). The mechanism of transformation from Na2WO4 to product WO3 was studied and the photocatalytic performance of the WO3 nanomaterials was evaluated by the degradation experiment of the p-nitrophenol solution under ultraviolet light. The results show that the NH4F−WO3 sample with co-exposed 200/002/020 facets exhibit the best photocatalytic performance in the photocatalytic degradation of p-nitrophenol solution.

     

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