Microwave-assisted synthesis of hematite/activated graphene composites with superior performance for photocatalytic reduction of Cr(VI)

Du Yuanxin; Tao Zhuchen; Guan Jian; Sun Zijun; Zeng Wencong; Wen Pengchao; Ni Kun; Ye Jianglin; Yang Shangfeng; Du Pingwu; Zhu Yanwu

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Microwave-assisted synthesis of hematite/activated graphene composites with superior performance for photocatalytic reduction of Cr(VI)

机译：微波辅助合成赤铁矿/活性石墨烯复合材料，具有优异的CR（VI）的光催化减少性能

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Hematite (alpha-Fe2O3) nanoparticles are deposited onto porous 'activated microwave expanded graphite oxide' (aMEGO) carbon via a simple, rapid one-pot microwave process. Under the irradiation of visible light, the alpha-Fe2O3/aMEGO composites exhibit significantly enhanced photocatalytic activity for the reduction of Cr(VI) to Cr(III). A maximum Cr(VI) removal rate of 95.28% is obtained for the composite containing 7.72 wt% aMEGO as compared to that of 25.26% for pure alpha-Fe2O3; the rate constant of the composite is nearly 9 times higher than that of pure alpha-Fe2O3. The crucial role of aMEGO in enhancing the photocatalytic efficiency of the composites relies not only on its large surface area, but also on the high conductivity which benefits the transport of photoexcited electrons. The enhancement in the charge separation and the suppression in the electron-hole pair recombination is evidenced by an increased photocurrent and a suppressed photoluminescence in the alpha-Fe2O3/aMEGO composites.

机译：通过简单，快速的单壶微波方法将赤铁矿（α-Fe2O3）纳米颗粒沉积在多孔的“活化的微波膨胀的石墨氧化物”（Amego）碳上。在可见光的照射下，α-Fe2O3 / amego复合材料表现出显着增强的光催化活性，用于还原Cr（vi）至Cr（iii）。与纯α-Fe2O3的25.26％相比，获得含有7.72wt％的复合材料的最大Cr（VI）去除率为95.28％。复合材料的速率常数比纯α-Fe2O3高近9倍。 AmeGo在增强复合材料的光催化效率方面不仅依靠其大表面积，而且依赖于利益的高电导率，这依赖于其较大的电导率。通过α-Fe 2 O 3 / amego复合材料中的增加的光电流和抑制的光致发光来证明电荷分离和抑制的电荷分离和抑制的增强。

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来源
《RSC Advances》 |2015年第99期|共7页
作者
Du Yuanxin; Tao Zhuchen; Guan Jian; Sun Zijun; Zeng Wencong; Wen Pengchao; Ni Kun; Ye Jianglin; Yang Shangfeng; Du Pingwu; Zhu Yanwu;
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作者单位

Univ Sci &

Technol China Key Lab Mat Energy Convers Chinese Acad Sci Dept Mat Sci &

Engn Hefei 230026 Anhui Peoples R China;

Univ Sci &

Technol China Key Lab Mat Energy Convers Chinese Acad Sci Dept Mat Sci &

Engn Hefei 230026 Anhui Peoples R China;

Univ Sci &

Technol China Key Lab Mat Energy Convers Chinese Acad Sci Dept Mat Sci &

Engn Hefei 230026 Anhui Peoples R China;

Univ Sci &

Technol China Key Lab Mat Energy Convers Chinese Acad Sci Dept Mat Sci &

Engn Hefei 230026 Anhui Peoples R China;

Univ Sci &

Technol China Key Lab Mat Energy Convers Chinese Acad Sci Dept Mat Sci &

Engn Hefei 230026 Anhui Peoples R China;

Univ Sci &

Technol China Key Lab Mat Energy Convers Chinese Acad Sci Dept Mat Sci &

Engn Hefei 230026 Anhui Peoples R China;

Univ Sci &

Technol China Key Lab Mat Energy Convers Chinese Acad Sci Dept Mat Sci &

Engn Hefei 230026 Anhui Peoples R China;

Univ Sci &

Technol China Key Lab Mat Energy Convers Chinese Acad Sci Dept Mat Sci &

Engn Hefei 230026 Anhui Peoples R China;

Univ Sci &

Technol China Key Lab Mat Energy Convers Chinese Acad Sci Dept Mat Sci &

Engn Hefei 230026 Anhui Peoples R China;

Univ Sci &

Technol China Key Lab Mat Energy Convers Chinese Acad Sci Dept Mat Sci &

Engn Hefei 230026 Anhui Peoples R China;

Univ Sci &

Technol China Key Lab Mat Energy Convers Chinese Acad Sci Dept Mat Sci &

Engn Hefei 230026 Anhui Peoples R China;

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中图分类化学;
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专利

1. Microwave-assisted synthesis of hematite/activated graphene composites with superior performance for photocatalytic reduction of Cr(VI) [J] . Du Yuanxin, Tao Zhuchen, Guan Jian, RSC Advances . 2015,第99期

机译：微波辅助合成赤铁矿/活性石墨烯复合材料，具有优异的CR（VI）的光催化减少性能
2. One-step in-situ hydrothermal synthesis of SnS2/reduced graphene oxide nanocomposites with high performance in visible light-driven photocatalytic reduction of aqueous Cr(VI) [J] . Liu Hui, Deng Lu, Zhang Zhifu, Journal of Materials Science . 2015,第8期

机译：一步法原位水热合成SnS2 /还原型氧化石墨烯纳米复合材料，在可见光驱动的Cr（VI）光催化还原中具有高性能
3. Microwave-assisted in situ synthesis of reduced graphene oxide-BiVO_4 composite photocatalysts and their enhanced photocatalytic performance for the degradation of ciprofloxacin [J] . Yan Yan, Shaofang Sun, Yang Song, Journal of Hazardous Materials . 2013,第apra15期

机译：微波辅助原位合成氧化石墨烯-BiVO_4复合光催化剂及其增强的环丙沙星降解性能
4. Microwave-assisted Synthesis of ZnO for Photocatalytic Reduction of Cr (VI) in Aqueous Solution [C] . Xinjuan Liu, Tian Lv, Likun Pan, 2011 Qingdao international conference on desalination and water reuse : Proceedings. . 2011

机译：微波辅助合成ZnO用于光催化还原水溶液中的Cr（VI）
5. Microwave-assisted Synthesis of Excitation-dependent Photoluminescent Graphene Nanosheets from Glucose [D] . Yin, Ruijuan. 2018

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6. Photocatalytic reduction synthesis of SrTiO3-graphene nanocomposites and their enhanced photocatalytic activity [O] . Tao Xian, Hua Yang, Lijing Di, 2014

机译：SrTiO3-石墨烯纳米复合材料的光催化还原合成及其增强的光催化活性
7. Photocatalytic reduction synthesis of SrTiO3-graphene nanocomposites and their enhanced photocatalytic activity [O] . Tao Xian, Hua Yang, Lijing Di, 2014

机译：SrTiO3-石墨烯纳米复合材料的光催化还原合成及其增强的光催化活性

Microwave-assisted synthesis of hematite/activated graphene composites with superior performance for photocatalytic reduction of Cr(VI)

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