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RISS 인기검색어
- 검색키워드
- 저자 : Mogens H. Jakobsen (검색결과 5 건)
- 무료
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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>
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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.
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Disulfide polymer grafted porous carbon composites for heavy metal removal from stormwater runoff
Ko, Dongah,Mines, Paul D.,Jakobsen, Mogens H.,Yavuz, Cafer T.,Hansen, Hans Chr. B.,Andersen, Henrik R. Elsevier 2018 Chemical engineering journal Vol.348 No.-
<P><B>Abstract</B></P> <P>The emerging concern of heavy metal pollution derived from stormwater runoff has triggered a demand for effective heavy metal sorbents. To be an effective sorbent, high affinity along with rapid sorption kinetics for environmental relevant concentrations of heavy metals is important. Herein, we have introduced a new composite suitable for trace metal concentration removal, which consists of cheap and common granular activated carbon covered with polymers containing soft bases, thiols, through acyl chlorination (DiS-AC). Material characterization demonstrated that the polymer was successfully grafted and grown onto the surface of the carbon substrate. The distribution coefficient for Cd<SUP>2+</SUP> bonding was 89·10<SUP>3</SUP> L/kg at a solution concentration of 0.35 mg/L, which is notably higher than sorption affinities for Cd<SUP>2+</SUP> seen in conventional sorbents. The sorption isotherm is well described by the Freundlich isotherm and within an hour, half of the initial trace (0.2 mg/L) concentration of Cd<SUP>2+</SUP> was removed by the DiS-AC at a sorbent loading of 2 g/L. Therefore, the novel material DiS-AC promises to be an ideal candidate for filters treating stormwater runoff.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The novel disulfide polymer grafted activated carbon composites were devised. </LI> <LI> Covalent bonds between disulfide polymer and carbon substrate have been proven. </LI> <LI> DiS-AC showed rapid kinetics on removing heavy metal in overall range of pH 6–8. </LI> <LI> DiS-AC showed high affinity towards even for trace amount of heavy metal in water. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Selective removal of heavy metal ions by disulfide linked polymer networks
Ko, Dongah,Lee, Joo Sung,Patel, Hasmukh A.,Jakobsen, Mogens H.,Hwang, Yuhoon,Yavuz, Cafer T.,Hansen, Hans Chr. Bruun,Andersen, Henrik R. Elsevier 2017 Journal of hazardous materials Vol.332 No.-
<P><B>Abstract</B></P> <P>Heavy metal contaminated surface water is one of the oldest pollution problems, which is critical to ecosystems and human health. We devised disulfide linked polymer networks and employed as a sorbent for removing heavy metal ions from contaminated water. Although the polymer network material has a moderate surface area, it demonstrated cadmium removal efficiency equivalent to highly porous activated carbon while it showed 16 times faster sorption kinetics compared to activated carbon, owing to the high affinity of cadmium towards disulfide and thiol functionality in the polymer network. The metal sorption mechanism on polymer network was studied by sorption kinetics, effect of pH, and metal complexation. We observed that the metal ions–copper, cadmium, and zinc showed high binding affinity in polymer network, even in the presence of competing cations like calcium in water.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Disulfide/thiol polymer networks are promising as sorbent for heavy metals. </LI> <LI> Rapid sorption and high Langmuir affinity constant (a<SUB>L</SUB>) for stormwater treatment. </LI> <LI> Selective sorption for copper, cadmium, and zinc in the presence of calcium. </LI> <LI> Reusability likely due to structure stability of disulfide linked polymer networks. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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