Silver coatings on the exterior surface of monolithic activated carbon(MAC) with different morphology were prepared by directly immersing MAC into [Ag(NH3)2]NO3 solution. Acid and base treatments were employed to ...Silver coatings on the exterior surface of monolithic activated carbon(MAC) with different morphology were prepared by directly immersing MAC into [Ag(NH3)2]NO3 solution. Acid and base treatments were employed to modify the surface oxygenic groups of MAC, respectively. The MACs' Brunauer-EmmettTeller(BET) surface area, surface groups, and silver coating morphology were characterized by N2 adsorption, elemental analysis(EA), X-ray photoelectron spectroscopy(XPS), and scanning electron microscopy(SEM), respectively. The coating morphology was found to be closely related to the surface area and surface functional groups of MAC. For a raw MAC which contained a variety of oxygenic groups, HNO3 treatment enhanced the relative amount of highly oxidized groups such as carboxyl and carbonates, which disfavored the deposition of silver particles. By contrast, Na OH treatment significantly improved the amount of carbonyl groups, which in turn improved the deposition amount of silver. Importantly, lamella silver was produced on raw MAC while Na OH treatment resulted in granular particles because of the capping effect of carbonyl groups. At appropriate [Ag(NH3)2]NO3 concentrations, silver nanoparticles smaller than 100 nm were homogeneously dispersed on Na OH-treated MAC. The successful tuning of the size and morphology of silver coatings on MAC is promising for novel applications in air purification and for antibacterial or aesthetic purposes.展开更多
基金The Natural Science Foundation of China(Nos.6143500961177087+7 种基金61377099)National Program on Key Basic Research Project(973 Program)(No.2012CB722703)International Science&Technology Cooperation Program of China(No.2011DFA12040)Scientific Research Fund of Zhejiang Provincial Education Department(No.R1101263)Natural Science Foundation of Ningbo(No.2013A610118)Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institutions of MOE,P.R.C.Ningbo Optoelectronic Materials and Devices Creative Team(No.2009B21007)Scientific Research Foundation of Graduate School of Ningbo University,K.C.Wong Magna Fund of Ningbo University and the Outstanding(No.Postgraduate)Dissertation Growth Foundation of Ningbo University(No.PY2014014)
基金Funded by the Interdisciplinary Program of Shanghai Jiao Tong University(YG2016MS24)
文摘Silver coatings on the exterior surface of monolithic activated carbon(MAC) with different morphology were prepared by directly immersing MAC into [Ag(NH3)2]NO3 solution. Acid and base treatments were employed to modify the surface oxygenic groups of MAC, respectively. The MACs' Brunauer-EmmettTeller(BET) surface area, surface groups, and silver coating morphology were characterized by N2 adsorption, elemental analysis(EA), X-ray photoelectron spectroscopy(XPS), and scanning electron microscopy(SEM), respectively. The coating morphology was found to be closely related to the surface area and surface functional groups of MAC. For a raw MAC which contained a variety of oxygenic groups, HNO3 treatment enhanced the relative amount of highly oxidized groups such as carboxyl and carbonates, which disfavored the deposition of silver particles. By contrast, Na OH treatment significantly improved the amount of carbonyl groups, which in turn improved the deposition amount of silver. Importantly, lamella silver was produced on raw MAC while Na OH treatment resulted in granular particles because of the capping effect of carbonyl groups. At appropriate [Ag(NH3)2]NO3 concentrations, silver nanoparticles smaller than 100 nm were homogeneously dispersed on Na OH-treated MAC. The successful tuning of the size and morphology of silver coatings on MAC is promising for novel applications in air purification and for antibacterial or aesthetic purposes.