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

doi:10.11944/j.issn.1000-0518.2019.03.180220

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()

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)

Abstract

Abstract:

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;

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.

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

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