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RISS 인기검색어
- 검색키워드
- 저자 : Jim J. Wang (검색결과 4 건)
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박종환,Jim J. Wang,Negar Tafti,Ronald D. Delaune 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.71 No.-
A new heterogeneous Fenton catalyst, Fe-impregnated biochar catalyst (Fe-BC) was synthesized andevaluated in detail for its catalytic activity with sulfate radical under various conditions. The optimumconditions for the removal of Eriochrome Black T (EBT) by Fe-BC were determined as 0.27 g/L K2S2O8 (PS)and 0.5 g/L Fe-BC for 0.1 g/L EBT, and which resulted 85–88% removal efficiency within 2 h. The effectiveoxidation of EBT was observed over a pH range of 2–4 and temperature of 25–45 C and maintained EBTremoval efficiency of 77.6–92.7%. Under optimum conditions, the catalytic activity was faster in the orderof PS > PS + HP > H2O2 (HP) >>Fe-BC (without oxidants). The catalytic activity of Fe-BC for EBT can beidentified in two stages, which occur rapidly within 30 min (1st stage) and followed by slow oxidationuntil 120 min (2nd stage). Catalytic activity by sulfate radical was also dominantly influenced by otherpollutant such as iodide, phosphate and humic acid. Overall, the sulfate radical generated from Fe-BC/PSwas found more economical with strong oxidation efficiency for use in Fenton-like reaction for treatingorganic pollutants compared with conventional Fenton reaction with H2O2.
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Park, Jong-Hwan,Wang, Jim J.,Kim, Seong-Heon,Cho, Ju-Sik,Kang, Se-Won,Delaune, Ronald D.,Han, Kun-Jun,Seo, Dong-Cheol Elsevier 2017 Colloids and surfaces. A, Physicochemical and engi Vol.533 No.-
<P><B>Abstract</B></P> <P>Biochar has been suggested as new adsorbent for removing heavy metals from aqueous solutions. However, adsorption nature of biochar is influenced by feedstock-specific properties. In this study, experiments were performed to characterize the effect of cation exchange on adsorption behavior of Cu and Zn in single- and binary-metal systems by rice straw biochar (RSB) made by pyrolysis at 600°C. Result of kinetic experiment showed that the Cu and Zn in aqueous solution were rapidly adsorbed from the RSB in the first 2h and then reached the equilibrium after 4h. The fitting of intraparticale diffusion model showed fast Cu diffusion into boundary layer and pores of biochar than Zn. In parallel with 2.65meqL<SUP>−1</SUP> Cu and 1.79meqL<SUP>−1</SUP> Zn being adsorbed by RSB, up to 1.65 and 0.76meqL<SUP>−1</SUP> exchangeable cations were released into the solution, indicating that cation exchange could contribute 62.3 and 42.5% to Cu and Zn sorption by RSB. Langmuir maximum adsorption capacities (<I>a</I>) of RSB for Cu and Zn were 56.5 and 38.6mgg<SUP>−1</SUP> in single-metal system and 40.2 and 7.9mgg<SUP>−1</SUP> in binary-metal system, respectively. Overall, the results demonstrate that the Cu and Zn adsorption by RSB was closely related to the exchangeable cation. The application of RSB could be especially attractive when considering biochar with high cation exchange capacities.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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The climate effects of increasing ocean albedo: an idealized representation of solar geoengineering
Kravitz, Ben,Rasch, Philip J.,Wang, Hailong,Robock, Alan,Gabriel, Corey,Boucher, Olivier,Cole, Jason N. S.,Haywood, Jim,Ji, Duoying,Jones, Andy,Lenton, Andrew,Moore, John C.,Muri, Helene,Niemeier, Ulr Copernicus GmbH 2018 Atmospheric chemistry and physics Vol.18 No.17
<P>Abstract. Geoengineering, or climate intervention, describes methods of deliberately altering the climate system to offset anthropogenic climate change. As an idealized representation of near-surface solar geoengineering over the ocean, such as marine cloud brightening, this paper discusses experiment G1ocean-albedo of the Geoengineering Model Intercomparison Project (GeoMIP), involving an abrupt quadrupling of the CO2 concentration and an instantaneous increase in ocean albedo to maintain approximate net top-of-atmosphere radiative flux balance. A total of 11 Earth system models are relatively consistent in their temperature, radiative flux, and hydrological cycle responses to this experiment. Due to the imposed forcing, air over the land surface warms by a model average of 1.14 K, while air over most of the ocean cools. Some parts of the near-surface air temperature over ocean warm due to heat transport from land to ocean. These changes generally resolve within a few years, indicating that changes in ocean heat content play at most a small role in the warming over the oceans. The hydrological cycle response is a general slowing down, with high heterogeneity in the response, particularly in the tropics. While idealized, these results have important implications for marine cloud brightening, or other methods of geoengineering involving spatially heterogeneous forcing, or other general forcings with a strong land-ocean contrast. It also reinforces previous findings that keeping top-of-atmosphere net radiative flux constant is not sufficient for preventing changes in global mean temperature. </P>
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Phosphate removal in constructed wetland with rapid cooled basic oxygen furnace slag
Park, Jong-Hwan,Wang, Jim J.,Kim, Seong-Heon,Cho, Ju-Sik,Kang, Se-Won,Delaune, Ronald D.,Seo, Dong-Cheol Elsevier 2017 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.327 No.-
<P><B>Abstract</B></P> <P>The objective of this study was to evaluate adsorption characteristics of phosphate by rapid cooled basic oxygen furnace slag (RC-BOFS) through various conditions and removal rate of phosphate in small-scale constructed wetland with RC-BOFS as filter material. The phosphate adsorption by RC-BOFS was rapid in the first 0.5h and the pseudo-second-order kinetic model fit the data better than the pseudo-first-order kinetic model. The maximum phosphate adsorption capacities of RC-BOFS under different pH were in the following order: 3.57mgPg<SUP>−1</SUP> (pH 5)>2.47mgPg<SUP>−1</SUP> (pH 7)>1.46mgPg<SUP>−1</SUP> (pH 9). Small-size RC-BOFS (0.8–2.3mm) was more efficient with 23% higher phosphate adsorption than big-size RC-BOFS (2.3–4.6mm). Characterization of RC-BOFS before and after phosphate adsorption by XRD, FTIR and SEM-EDS indicated that phosphate adsorption by RC-BOFS was dominated by metal oxide and precipitation by calcium and was closely related to the slag chemical properties. The phosphate saturation time in constructed wetland with coarse sand was predicted about 292days, whereas the longevity of constructed wetland with adding about 25% RC-BOFS to the coarse sand can significantly increase up to 1349days. It was concluded that the horizontal flow constructed wetland with sand 75%:RC-BOFS 25% ratio could achieve high phosphate removal rate and near-neutral pH for meeting the acceptable water quality discharge standard from water treatment plant.</P> <P><B>Highlights</B></P> <P> <UL> <LI> RC-BOFS was an effective adsorbent for phosphate. </LI> <LI> Contact time, initial concentration and pH value affect the adsorption capacity. </LI> <LI> Adsorption mechanisms were well described by SEM-EDS, XRD and FTIR. </LI> <LI> High phosphate adsorption capacity and near-neutral pH was observed in CW with sand and RC-BOFS. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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