Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (3): 314-323.DOI: 10.11944/j.issn.1000-0518.2019.03.180220

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

SUN Xuejiao,WANG Siqi,DONG Jia,WU Qi,LIU Rui,LI Xiang,YU Shijun(),ZHANG Zhiguang()   

  1. School of Chemistry and Chemical Engineering,Liaoning Normal University,Dalian,Liaoning 116029,China
  • Received:2018-06-22 Accepted:2018-09-29 Published:2019-03-01 Online:2019-02-28
  • Contact: YU Shijun,ZHANG Zhiguang
  • Supported by:
    Supported by the Natural Science Foundation of Liaoning Province of China(No.20170540578)


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.

Key words: metal-organic framework, Ag nanoparticle, visible light photocatalysis, Cr(Ⅵ) reduction;