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首页> 外文期刊>Journal of Hazardous Materials >Solar photocatalytic activity of TiO_2 modified with WO_3 on the degradation of an organophosphorus pesticide
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Solar photocatalytic activity of TiO_2 modified with WO_3 on the degradation of an organophosphorus pesticide

机译：WO_3改性TiO_2的太阳光催化降解有机磷农药的研究。

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摘要

In this study, the solar photocatalytic activity (SPA) of WO_3/TiO_2 photocatalysts synthesized by the sol-gel method with two different percentages of WO_3 (2 and 5%wt) was evaluated using malathion as a model contaminant. For comparative purpose bare TiO_2 was also prepared by sol-gel process. The powders were characterized by X-ray diffraction (XRD), Raman spectroscopy, diffuse reflectance UV-vis spectroscopy (DRUV-vis), specific surface area by the BET method (SSAbet). scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and scanning transmission electron microscopy with a high annular angle dark field detector (STEM-HAADF). The XRD, Raman, HRTEM and STEM-HAADF analyses indicated that WO_3 was present as a monoclinic crystalline phase with nanometric cluster sizes (1.1 ±0.1 nm for 2% WO_3/TiO_2 and 1.35±0.3nm for 5% WO_3/TiO_2) and uniformly dispersed on the surface of TiO_2 .The particle size of the materials was 19.4±3.3nm and 25.6 ±3 nm for 2% and 5% WO_3/TiO_2, respectively. The SPA was evaluated on the degradation of commercial malathion pesticide using natural solar light. The 2% WO_3/TiO_2 photocatalyst exhibited the best photocatalytic activity achieving 76% of total organic carbon (TOC) abatement after 300 min compared to the 5% WO_3/TiO_2 and bare TiO_2 photocatalysts, which achieved 28 and 47% mineralization, respectively. Finally, experiments were performed to assess 2% WO_3/TiO_2 catalyst activity on repeated uses; after several successive cycles its photocatalytic activity was retained showing long-term stability.
机译：在这项研究中，使用马拉硫磷作为模型污染物，评估了通过溶胶-凝胶法合成的WO_3 / TiO_2光催化剂的太阳光催化活性（SPA），该方法具有两种不同百分比的WO_3（2和5％wt）。为了比较，还通过溶胶-凝胶法制备了裸露的TiO_2。通过X射线衍射（XRD），拉曼光谱，漫反射紫外可见光谱（DRUV-vis），比表面积通过BET法（SSAbet）表征粉末。扫描电子显微镜（SEM），高分辨率透射电子显微镜（HRTEM）和带有高环形角暗场检测器（STEM-HAADF）的扫描透射电子显微镜。 XRD，拉曼光谱，HRTEM和STEM-HAADF分析表明，WO_3以单簇晶相的形式存在，具有纳米簇大小（2％WO_3 / TiO_2为1.1±0.1 nm，5％WO_3 / TiO_2为1.35±0.3nm），并且均一分散在TiO_2的表面上.WO_3 / TiO_2的含量为2％和5％时，材料的粒径分别为19.4±3.3nm和25.6±3 nm。对SPA进行了使用天然太阳光降解商用马拉硫磷农药的评估。 2％WO_3 / TiO_2光催化剂表现出最佳的光催化活性，在300分钟后达到了总有机碳（TOC）减排量的76％，而5％WO_3 / TiO_2和裸TiO_2光催化剂分别实现了28％和47％的矿化。最后，进行了实验以评估重复使用2％WO_3 / TiO_2催化剂的活性。在连续几个循环后，其光催化活性得以保留，显示出长期稳定性。

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  • 来源
    《Journal of Hazardous Materials》 |2013年第1期|36-44|共9页
  • 作者

    N.A. Ramos-Delgado; M.A.Gracia-Pinilla; L.Maya-Trevino; L. Hinojosa-Reyes; J.L. Guzman-Mar; A. Hernandez-Ramirez;

  • 作者单位

    Universidad Autonoma de Nuevo Ledn, Facultad de Ciencias Quimicas, San Nicolas de los Garza, N.L, Mexico;

    Universidad Autonoma de Nuevo Ledn, Facultad de Ciencias Fisico-Matemdticas, Av. Universidad, Cd. Universitaria, San Nicolas de los Garza, N.L, Mexico,Universidad Autonoma de Nuevo Ledn, Centro de Investigation e Innovation en Desarrollo de Ingenieria y Tecnologia, PUT Km 6, Carretera at Aeropuerto, Apodaca, N.L, Mexico;

    Universidad Autonoma de Nuevo Ledn, Facultad de Ciencias Quimicas, San Nicolas de los Garza, N.L, Mexico;

    Universidad Autonoma de Nuevo Ledn, Facultad de Ciencias Quimicas, San Nicolas de los Garza, N.L, Mexico;

    Universidad Autonoma de Nuevo Ledn, Facultad de Ciencias Quimicas, San Nicolas de los Garza, N.L, Mexico;

    Universidad Autonoma de Nuevo Ledn, Facultad de Ciencias Quimicas, San Nicolas de los Garza, N.L, Mexico;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    WO_3-TiO_2; Long-term stability; Photocatalytic activity;

    机译：WO_3-TiO_2;长期稳定性;光催化活性;

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