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首页> 外文期刊>RSC Advances >An anion-exchange strategy for 3D hierarchical (BiO)(2)CO3/amorphous Bi2S3 heterostructures with increased solar absorption and enhanced visible light photocatalysis
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An anion-exchange strategy for 3D hierarchical (BiO)(2)CO3/amorphous Bi2S3 heterostructures with increased solar absorption and enhanced visible light photocatalysis

机译：3D层次（BIO）（2）CO3 /非晶BI2S3异质结构具有增加的太阳能吸收和增强可见光光催化的阴离子 - 交换策略

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摘要

Bismuth-based nanostructured materials have attracted great interest in a wide range of applications. In the present work, 3D (BiO)(2)CO3 hierarchical microspheres self-assembled by nanosheets were synthesized by a simple hydrothermal method. By using a facile anion-exchange strategy, (BiO)(2)CO3/amorphous Bi2S3 heterostructures were constructed through the controlled chemical reaction between (BiO)(2)CO3 microspheres and Na2S in an aqueous solution. The as-prepared samples were systematically characterized by XRD, SEM-EDX, TEM, FT-IR, XPS, UV-vis DRS and PL techniques. The heterostructured samples were applied for photocatalytic removal of ppb-level NO in air under visible light irradiation. The pure (BiO)(2)CO3 hierarchical microspheres exhibited decent visible light photocatalytic activity due to the surface reflecting and scattering effect. Amorphous Bi2S3 showed no photocatalytic activity due to narrow band gap. By hybridization of (BiO)(2)CO3 microspheres with amorphous Bi2S3 on the surface, 3D hierarchical (BiO)(2)CO3/amorphous Bi2S3 heterostructures were constructed, which demonstrated increased solar light absorption and highly enhanced visible photocatalytic activity and stability. The enhanced performance can be directly ascribed to the increased visible light utilization, promoted charge separation arising from the well-matched band structure and accelerated reactants transfer resulting from special 3D hierarchical structure. The present work opens a new avenue for modification of wide-band gap semiconductor with amorphous components, which could reduce the further thermal treatment and production cost.
机译：基于铋的纳米结构材料在广泛的应用中引起了极大的兴趣。在本作工作中，通过简单的水热法合成通过纳米片自组装的3D（Bio）（2）CO3分层微球。通过使用容易的阴离子 - 交换策略，通过（Bio）（2）CO3微球和Na 2 S中的受控化学反应在水溶液中的受控化学反应构建，构建了（Bio）（2）CO 3 /非晶BI2S3异质结构。通过XRD，SEM-EDX，TEM，FT-IR，XPS，UV-VIS和PL技术系统地表征了制备的样品。在可见光照射下，施加异质结构样品用于光催化去除空气中的PPB级别。纯（Bio）（2）CO 3分层微球表现出由于表面反射和散射效应而具有体积可见光光催化活性。非晶BI2S3由于窄带隙而没有显示光催化活性。通过在表面上与无定形Bi2S3的（Bio）（2）CO 3微球的杂交，构建了3D层次（Bio）（2）CO 3 /无定形Bi2S3异质结构，其显示出增加的太阳光吸收和高度增强的可见光催化活性和稳定性。增强的性能可以直接归因于增加的可见光利用，促进从匹配的带结构产生的电荷分离和由特殊的3D层次结构产生的加速反应物转移。目前的工作开辟了一种新的宽带隙半导体与无定形组分的新途径，这可以降低进一步的热处理和生产成本。

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  • 来源
    《RSC Advances》 |2015年第16期|共10页
  • 作者

    Dong Fan; Feng Xin; Zhang Yuxin; Gao Chunfeng; Wu Zhongbiao;

  • 作者单位

    Chongqing Technol &

    Business Univ Coll Environm &

    Biol Engn Chongqing Key Lab Catalysis &

    Funct Organ Mol Chongqing 400067 Peoples R China;

    Chongqing Technol &

    Business Univ Coll Environm &

    Biol Engn Chongqing Key Lab Catalysis &

    Funct Organ Mol Chongqing 400067 Peoples R China;

    Chongqing Univ Coll Mat Sci &

    Engn Chongqing 400044 Peoples R China;

    Chongqing Technol &

    Business Univ Coll Environm &

    Biol Engn Chongqing Key Lab Catalysis &

    Funct Organ Mol Chongqing 400067 Peoples R China;

    Zhejiang Univ Dept Environm Engn Hangzhou 310027 Zhejiang Peoples R China;

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