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Mines, Paul D.,Uthuppu, Basil,Thirion, Damien,Jakobsen, Mogens H.,Yavuz, Cafer T.,Andersen, Henrik R.,Hwang, Yuhoon Elsevier 2018 Chemical engineering journal Vol.339 No.-
<P><B>Abstract</B></P> <P>Granular activated carbon was customized with a chemical grafting procedure of a nanoporous polymeric network for the purpose of nanoscale zero-valent iron impregnation and subsequent water contaminant remediation. Characterization of the prepared composite material revealed that not only was the polymer attachment and iron impregnation successful, but also that the polymeric shell acted as a protective barrier against the effects of oxidation from the surrounding environment, nearly 99% of total iron content was in the form of zero-valent iron. When applied towards the remediation of two common water contaminants, nitrobenzene and nitrate, the composite material exploited the qualities of both the activated carbon and the polymeric network to work together in a synergistic manner. In that the increased protection from oxidation allowed for increased reactivity of the nanoscale zero-valent iron, and that the adsorption abilities of both the carbon and the polymer achieved a higher amount of total removal of the contaminants.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nanoporous polymeric networks are chemically grafted to activated carbon granules. </LI> <LI> Hybrid polymer/carbon composites are impregnated with nanoscale zero-valent iron. </LI> <LI> Composite materials increase nZVI content and protect against oxidation. </LI> <LI> Materials provide effective simultaneous adsorption and degradation of pollutants. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Nara,Choi, Kyunghoon,Uthuppu, Basil,Jakobsen, Mogens H.,Hwang, Yuhoon,Broholm, Mette M.,Lee, Woojin Techno-Press 2014 Advances in environmental research Vol.3 No.2
This study aimed to synthesize dispersed and reactive nanoscale zero-valent iron (nZVI) with poly(1-vinylpyrrolidone-co-vinyl acetate) (PVP/VA), nontoxic and biodegradable stabilizer. The nZVI used for the experiments was prepared by reduction of ferric solution in the presence of PVP/VA with specific weight ratios to iron contents. Colloidal stability was investigated based on the rate of sedimentation, hydrodynamic radius and zeta potential measurement. The characteristic time, which demonstrated dispersivity of particles resisting aggregation, increased from 21.2 min (bare nZVI) to 97.8 min with increasing amount of PVP/VA (the ratios of 2). For the most stable nZVI coated by PVP/VA, its reactivity was examined by nitrate reduction in a closed batch system. The pseudo-first-order kinetic rate constants for the nitrate reduction by the nanoparticles with PVP/VA ratios of 0 and 2 were 0.1633 and $0.1395min^{-1}$ respectively. A nitrogen mass balance, established by quantitative analysis of aqueous nitrogen species, showed that the addition of PVP/VA to nZVI can change the reduction capacity of the nanoparticles.
Mines, P.D.,Thirion, D.,Uthuppu, B.,Hwang, Y.,Jakobsen, M.H.,Andersen, H.R.,Yavuz, C.T. Elsevier 2017 Chemical engineering journal Vol.309 No.-
Nanoporous networks of covalent organic polymers (COPs) are successfully grafted on the surfaces of activated carbons, through a series of surface modification techniques, including acyl chloride formation by thionyl chloride. Hybrid composites of activated carbon functionalized with COPs exhibit a core-shell formation of COP material grafted to the outer layers of activated carbon. This general method brings features of both COPs and porous carbons together for target-specific environmental remediation applications, which was corroborated with successful adsorption tests for organic dyes and metals.