Reduction of Hexavalent Chromium over the Expanded Graphite Supported Palladium Nanocatalyst†

doi:10.7503/cjcu20140481

Abstract

Abstract:

Expanded graphite(EG) supported palladium nanocatalysts(Pd-EG) were synthesized by wet-impregnation reduction method with the aid of a polymer stabilizer. The catalysts were characterized by various techniques including X-ray diffraction(XRD), transmission electron microscope(TEM) and X-ray photoelectron spectroscopy(XPS). The catalytic activities of the synthesized Pd-EG nanocatalysts were evaluated for the reduction of Cr(Ⅵ). The results indicated that the Pd loading of Pd-EG nanocatalysts was 0.446%(mass fraction) in the form of Pd nanoparticles with an average diameter of 4.37 nm. The Pd-EG nanocatalysts show high catalytic activity in the complete reduction of Cr(Ⅵ) to Cr(Ⅲ) with a turn-over frequency(TOF) of 3186 h^-1 at pH=4.0 and 45 ℃. The Pd-EG catalysts exhibit efficient and stable catalytic performance even after several times of recycles.

Key words: Expanded graphite, Palladium, Nanoparticles, Hexavalent chromium, Catalysis, Reduction

CLC Number:

O643.3

TrendMD:

WEI Yingxiang, TU Weixia. Reduction of Hexavalent Chromium over the Expanded Graphite Supported Palladium Nanocatalyst^†[J]. Chem. J. Chinese Universities, 2014, 35(11): 2397.

Figures/Tables 5

Fig.1 Catalytic activities of Pd-EG catalysts in the reduction of Cr(Ⅵ)(A), UV-Vis absorption spectra of the reaction solution at different reaction time(B) and the contrast experiments(C)

Fig.2 TEM images(A, B) and size distribution(C) of Pd-EG catalyst

Fig.3 XRD pattern(A) and XPS spectra(B, C) of the Pd-EG catalyst

Fig.4 Effects of pH(A), reaction temperature(B) and mass of catalyst(C) on reduction rate of Cr(Ⅵ)

Fig.5 Catalytic activity of Pd-EG catalyst at different recycling times

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