无机材料学报 ›› 2021, Vol. 36 ›› Issue (7): 725-732.DOI: 10.15541/jim20200594

所属专题: 【能源环境】光催化降解有机分子

• 研究论文 • 上一篇    下一篇

石墨烯-铁酸铋纳米晶复合材料的制备及其催化性能研究

李铁1(), 李玥1, 王颖异2, 张珽1   

  1. 1.中国科学院 苏州纳米技术与纳米仿生研究所, 苏州 215123
    2.西交利物浦大学, 苏州 215123
  • 收稿日期:2020-10-19 修回日期:2021-01-27 出版日期:2021-07-20 网络出版日期:2021-03-01
  • 作者简介:李铁(1984-), 男, 副研究员. E-mail:tli2014@sinano.ac.cn
  • 基金资助:
    国家重点研发计划(2017YFA0701101);国家重点研发计划(2020YFB2008501);国家自然科学基金(62071462);国家自然科学基金(51702354);中国科学院青年促进会(2020320);江苏省基础研究计划面上项目(BK20201195);苏州市重点产业技术创新项目(SYG202029)

Preparation and Catalytic Properties of Graphene-Bismuth Ferrite Nanocrystal Nanocomposite

LI Tie1(), LI Yue1, WANG Yingyi2, ZHANG Ting1   

  1. 1. Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China
    2. Xi’an Jiao-tong Liverpool University, Suzhou 215123, China
  • Received:2020-10-19 Revised:2021-01-27 Published:2021-07-20 Online:2021-03-01
  • About author:LI Tie(1984-), male, associate professor. E-mail:tli2014@sinano.ac.cn
  • Supported by:
    National Key R&D Program of China(2017YFA0701101);National Key R&D Program of China(2020YFB2008501);National Natural Science Foundation of China(62071462);National Natural Science Foundation of China(51702354);Youth Promotion Association of Chinese Academy of Sciences(2020320);Foundation Research Project of Jiangsu Province(BK20201195);Suzhou Key Industrial Technology Innovation Project(SYG202029)

摘要:

BiFeO3(BFO)是一种新型可回收光响应催化剂, 但较高的光生电子/空穴对复合率和较低的量子产率限制了其实际应用。本研究通过水热法制备出还原氧化石墨烯-BFO(RGO-BFO)纳米晶复合材料, 表征与测试结果表明, 相比于BFO颗粒, 复合材料的禁带宽度Eg为2.0 eV, 降低约10%; 40 min对亚甲基蓝吸附-催化效率接近100%, 远高于BFO颗粒(28%), 这主要由于复合体系中光生电子/空穴对复合率更低。通过本征磁性回收并重复利用6次后, 复合材料仍保持89.1%催化效率, 表现出优异催化性能。

关键词: 铁酸铋, 纳米晶, 石墨烯, 催化降解

Abstract:

BiFeO3 (BFO) is a novel recyclable photocatalyst which benefits from its appropriate theoretical band gap and room temperature ferromagnetism, yet the relatively high recombination rate of photogenerated electron-hole pairs and low quantum yield limit its practical catalytic performance. Here, a composite material of reduced graphene oxide and BiFeO3 nanocrystals (RGO-BFO) was successfully prepared via a hydrothermal self-assembly process with about 10wt% RGO loaded 85wt% BFO nanocrystalline (~10 nm). Specific surface area of the composite is about 5 times of that of pure BFO particles. Furthermore, this nanocomposite demonstrates the enhanced ultraviolet absorption behavior as well as its intrinsic visible light absorption, with an energy gap (Eg) of 2.0 eV, which is about 10% lower than BFO particles (2.3 eV). As a result, a significantly higher catalytic efficiency of nearly 100% of the RGO-BFO was obtained as compared to the 25% value of BFO after a 40-min process of adsorption and photodegradation for methylene blue. The improved performances may be attributed to the additional photogenerated electron-hole pairs and lower recombination ratio, which can be proved by the result of photoelectric response. As an intrinsically ferromagnetic material, it could be easily recycled from the solvent system, and its repetitive catalytic efficiency maintained 89.1% after 6 cycles, showing a good catalytic stability.

Key words: bismuth ferrite, nanocrystals, graphene, catalytic degradation

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