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首页> 外文期刊>Applied Surface Science >Rapid Cr(Ⅵ) reduction in aqueous solution using a novel microwave-based treatment with MoS_2-MnFe_2O_4 composite
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Rapid Cr(Ⅵ) reduction in aqueous solution using a novel microwave-based treatment with MoS_2-MnFe_2O_4 composite

机译：MoS_2-MnFe_2O_4复合材料的新型微波处理快速去除水溶液中的Cr（Ⅵ）

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摘要

Microwave-induced catalytic system has been widely used in oxidation of organic pollutants, but no report focuses on heavy metal reduction. To expand the application field of microwave-induced catalytic system, MoS2 decorated MnFe2O4 was synthesized by hydrothermal method and employed for the reduction of Cr(VI) in microwave-induced catalytic system. The morphologies, chemical compositions, and optical properties of the synthesized catalysts were investigated using SEM, XRD, FT-IR and XPS. The MoS2-MnFe(2)O(4 )samples exhibited significantly enhanced microwave-catalytic performance for Cr(VI) reduction compared to pristine MoS2 and MnFe2O4, among which, the MoS2-MnFe2O4 (10 wt%) sample was most suitable for Cr(VI) reduction in aqueous solution. 85.8% of Cr(VI) removal was obtained in 16 min in the present of MoS2-MnFe2O4. The effect of catalyst dosage, initial pH and microwave output on Cr(VI) reduction were investigated. Mechanism of Cr(VI) removal was investigated by radical quenching experiments. The enhanced microwave-catalytic activity of MoS2-MnFe2O4 may be owing to the fact that MoS2 can act as an electron acceptor to suppress the recombination of microwave-excited electron-holes. These results showed that microwave-induced catalytic reduction system is promising in Cr(VI) decontamination in aqueous solution.
机译：微波诱导的催化系统已被广泛用于有机污染物的氧化，但没有关于重金属还原的报道。为了扩大微波诱导催化体系的应用领域，采用水热法合成了MoS2修饰的MnFe2O4，并用于微波诱导催化体系中Cr（VI）的还原。利用SEM，XRD，FT-IR和XPS研究了合成催化剂的形貌，化学组成和光学性质。与原始MoS2和MnFe2O4相比，MoS2-MnFe（2）O（4）样品显示出显着增强的微波催化Cr（VI）还原性能，其中，MoS2-MnFe2O4（10 wt％）样品最适合于Cr （Ⅵ）减少水溶液。在存在MoS2-MnFe2O4的条件下，在16分钟内去除了85.8％的Cr（VI）。研究了催化剂用量，初始pH和微波输出量对Cr（VI）还原的影响。通过自由基猝灭实验研究了Cr（VI）去除的机理。 MoS2-MnFe2O4的增强的微波催化活性可能是由于MoS2可以充当电子受体来抑制微波激发的电子空穴的复合。这些结果表明，微波诱导的催化还原系统在水溶液中的Cr（VI）净化中很有希望。

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  • 来源
    《Applied Surface Science》 |2019年第31期|408-416|共9页
  • 作者

    Pang Yixiong; Kong Lingjun; Chen Diyun; Yuvaraja Gutha;

  • 作者单位

    Guangzhou Univ, Sch Environm Sci & Engn, Guangdong Prov Key Lab Radionuclides Pollut Contr, Guangzhou 510006, Guangdong, Peoples R China|Guangzhou Univ, Sch Civil Engn, Guangzhou 510006, Guangdong, Peoples R China;

    Guangzhou Univ, Sch Environm Sci & Engn, Guangdong Prov Key Lab Radionuclides Pollut Contr, Guangzhou 510006, Guangdong, Peoples R China|Univ Hong Kong, Dept Civil Engn, Pokfulam Rd, Hong Kong, Peoples R China;

    Guangzhou Univ, Sch Environm Sci & Engn, Guangdong Prov Key Lab Radionuclides Pollut Contr, Guangzhou 510006, Guangdong, Peoples R China;

    Guangzhou Univ, Sch Environm Sci & Engn, Guangdong Prov Key Lab Radionuclides Pollut Contr, Guangzhou 510006, Guangdong, Peoples R China|Guangzhou Univ, Sch Civil Engn, Guangzhou 510006, Guangdong, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Microwave-induced catalytic system; Reduction; MoS2-MnFe2O4; Cr(VI);

    机译：微波诱导催化体系还原MoS2-MnFe2O4Cr（VI）;

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