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首页> 外文期刊>RSC Advances >Supercritical CO2 synthesized TiO2 nanowires covalently linked with core-shell CdS-ZnS quantum dots: enhanced photocatalysis and stability
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Supercritical CO2 synthesized TiO2 nanowires covalently linked with core-shell CdS-ZnS quantum dots: enhanced photocatalysis and stability

机译：超临界CO 2合成TiO2纳米线与核 - 壳CDS-ZnS量子点共价连接：增强的光催化和稳定性

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摘要

Semiconductor quantum dots (QDs) sensitized onto nano TiO2 as heterogeneous photocatalysts have drawn considerable interest over the past few years. However, stability of the QDs attached to TiO2 and consistent photocatalysis are still major challenges of this approach. We describe herein, a facile process to fabricate nanocomposites from porous TiO2 nanowires and bare CdS and core-shell CdS-ZnS QDs, where the QD particles are linked covalently to the titania surface through a bifunctional organic linker, mercapto propionic acid (MPA). A thin layer of ZnS was grown on 6 nm CdS QDs to restrain the photocorrosion and passivate the trap states, enhancing the photoluminescence and quantum yield. The bifunctional linking molecule, MPA, was found to effectively disperse and stabilize the QD nanoparticles. The photocatalytic activities of the prepared catalysts were evaluated under ultraviolet and visible light solar irradiation for the photodegradation of methylene blue (MB), an organic dye. The decomposition rate of MB was enhanced as follows: CdSZnS-MPA-TiO2 > CdS-MPA-TiO2 > CdSZnS-TiO2 > CdS-TiO2 > TiO2 > P25. A maximum photodegradation efficiency of MB dye (similar to 88%) was obtained by core-shell CdS-ZnS QDs linked with nano TiO2. After 3 cycling tests of degradation, the loss of photoactivity was significantly minimized (from 68% to 10%) by CdSZnS-MPA-TiO2 compared to CdSZnS-TiO2 (by direct deposition).
机译：半导体量子点（QDS）在纳米TiO2上敏化为异质光催化剂在过去几年中绘制了大量兴趣。然而，附着于TiO2和一致光催化的QD的稳定性仍然是这种方法的主要挑战。我们在此描述了一种用于制造来自多孔TiO2纳米线和裸CDS和核 - 壳CDS-ZnS QD的纳米复合材料的容纳方法，其中QD颗粒通过双官能有机接头，巯基丙酸（MPa）共价连接到二氧化钛表面。在6nM CDS QD上生长一层薄层，以抑制光腐蚀并钝化捕集状态，增强光致发光和量子产率。发现双官能连接分子MPa有效地分散和稳定QD纳米颗粒。在紫外线和可见光太阳辐射下评价制备的催化剂的光催化活性，用于亚甲基蓝（MB），有机染料的光降解。 Mb的分解速率提高如下：Cdszns-MPa-TiO2> Cds-MPa-TiO2> Cdszns-TiO2> Cds-TiO2> TiO 2> P25。通过与纳米TiO2连接的核 - 壳CDS-ZnS QDS获得Mb染料的最大光降解效率（类似于88％）。在3次循环试验后，与Cdszns-TiO 2（通过直接沉积）相比，通过Cdszns-MPa-TiO 2显着最小化（从68％至10％）的光活性损失。

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  • 来源
    《RSC Advances》 |2015年第83期|共13页
  • 作者

    Mumin Md Abdul; Moula Golam; Charpentier Paul A.;

  • 作者单位

    Univ Western Ontario Dept Chem &

    Biochem Engn London ON N6A 5B9 Canada;

    Univ Western Ontario Dept Chem &

    Biochem Engn London ON N6A 5B9 Canada;

    Univ Western Ontario Dept Chem &

    Biochem Engn London ON N6A 5B9 Canada;

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  • 正文语种 eng
  • 中图分类 化学;
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