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Citation: SUN Xuejiao, WANG Siqi, DONG Jia, WU Qi, LIU Rui, LI Xiang, YU Shijun, ZHANG Zhiguang. Construction of Ag/NH2-MIL-125(Ti) Catalyst for Photo-Driven Reduction of Aqueous Cr(Ⅵ) Pollutant[J]. Chinese Journal of Applied Chemistry, ;2019, 36(3): 314-323. doi: 10.11944/j.issn.1000-0518.2019.03.180220 shu

Construction of Ag/NH2-MIL-125(Ti) Catalyst for Photo-Driven Reduction of Aqueous Cr(Ⅵ) Pollutant

  • School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian, Liaoning 116029, China

  • Corresponding author: YU Shijun, sjyu@lnnu.edu.cn ZHANG Zhiguang, zgzhang@lnnu.edu.cn
  • Received Date: 22 June 2018
    Revised Date: 23 August 2018
    Accepted Date: 29 September 2018

    Fund Project: the Natural Science Foundation of Liaoning Province of China 20170540578Supported by the Natural Science Foundation of Liaoning Province of China(No.20170540578)

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  • The development of efficient and stable photocatalysts is highly desired and significantly critical for the current environmental field. In this paper, a novel Ag/NH2-MIL-125(Ti) was successfully prepared by solvothermal coupled with simple ultraviolet(UV) reduction method. The morphology, structure and optical properties of as-prepared samples were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), UV-Vis diffuse reflectance spectra(DRS) and X-ray photoelectron spectroscopy(XPS). The photo-reduction performance of obtained catalysts were tested on Cr(Ⅵ) removal in various conditions. Under visible light irradiation(λ ≥ 420 nm), the catalysts dosage, heavy metal concentration, pH and hole scavenger were fully investigated to optimize the best Cr(Ⅵ) reduction parameters. The results indicate that Ag/NH2-MIL-125(Ti) exhibits excellent adsorption and photo-reduction activities on Cr(Ⅵ), which is 3.11 times higher than that of NH2-MIL-125(Ti). This special "sesame cakes" and heterojunction formation of Ag/NH2-MIL-125(Ti) are attributed to enhancing Cr(Ⅵ) catalytic reduction performance. Meanwhile, through the control experiments, the main active species during the photo-reduction route were suggested and the mechanism of the Cr(Ⅵ) reduction was proposed. This study will provide theoretical and experimental guidance for the application of novel metal-organic framework(MOF) composites in the field of environmental remediation.
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