Morphosynthesis of Porous Silver Cubes on the Surface of Hydrogen-pretreated Monolithic Activated Carbon

doi:10.7503/cjcu20160787

Abstract

Abstract:

The surface functional groups and pore structures of monolithic activated carbon(MAC) were modified by thermal treatment under hydrogen atmosphere. Then the hydrogen-treated MAC adsorbed Cl^- and Ag⁺ successively, and the as-formed AgCl cubes acted as sacrificial templates, which were in turn reduced by the surface functional groups of MAC, and porous silver cubes were obtained on the surface of MAC through morphosynthetic mechanism. The morphology, phase structure of the products were characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD), respectively. The functional groups of MAC were analyzed using X-ray photoelectron spectroscopy(XPS). The effect of the main experimental conditions on the morpho-logy of silver particles on MAC was investigated, including the temperature of hydrogen treatment, the concentration of Cl^- soaking solutions, the concentration of Ag⁺ solutions, and the types of Ag⁺ precursor. The results indicated that hydrogen treatment can on one hand reduce the amount of oxygen-containing groups of MAC and tune its reducing ability, and on the other hand improve the specific area of MAC, which may facilitate the adsorption of Cl^- and nucleation of AgCl. With hydrogen treatment, accompanied by proper concentrations of Cl^- and Ag⁺, and proper type of Ag⁺ precursor, well defined porous silver cubes can be obtained on MAC.

Key words: Hydrogen treatment, Moolithic activated carbon, Morphosynthesis, Porous silver cube

CLC Number:

O614

TrendMD:

WANG Danfeng, YANG Haiyan, NING Yuesheng, ZHAO Binyuan. Morphosynthesis of Porous Silver Cubes on the Surface of Hydrogen-pretreated Monolithic Activated Carbon[J]. Chem. J. Chinese Universities, 2017, 38(9): 1503.

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