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Kurt Louis Solis,Go Un Nam,Yongseok Hong 대한환경공학회 2016 Environmental Engineering Research Vol.21 No.1
The adsorption of inorganic mercury, Hg (II), in aqueous solution has been investigated to evaluate the effectiveness of synthesized gold (Au) nanoparticle-coated silica as sorbent in comparison with activated carbon and Au-coated sand. The synthesis of the Au-coated silica was confirmed by x-ray diffraction (Bragg reflections at 38.2°, 44.4°, 64.6°, and 77.5°) and the Au loading on silica surface was 6.91±1.14 mg/g. The synthesized Au-coated silica performed an average Hg adsorption efficiency of ~96 (±2.61) % with KD value of 9.96 (±0.32) L/g. The adsorption kinetics of Hg(II) on to Au-coated silica closely follows a pseudo-second order reaction where it is found out to have an initial adsorption rate of 4.73 g/μg/min/ and overall rate constant of 4.73 × 10(-4) g/μg/min/. Au-coated silica particles are effective in removing Hg (II) in aqueous solutions due to their relatively high KD values, rapid adsorption rate, and high overall efficiency that can even decrease mercury levels below the recommended concentrations in drinking water.
배연탈황시설 폐수에서 아황산에 의한 수은의 환원: 동역학 및 화학종 모델링
커트루이스솔리스 ( Kurt Louis B. Solis ),남고운 ( Go Un Nam ),홍용석 ( Yongseok Hong ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 추계학술발표논문집 Vol.2016 No.-
The re-emission of mercury (Hg), as a consequence of the formation and dissociation of the unstable complex HgSO<sub>3</sub>, is a problem encountered in flue gas desulphurization (FGD) treatment in coal-fired power plants. A model following a pseudo-second-order rate law for Hg<sup>2+</sup> reduction was derived as a function of [SO<sub>3</sub> <sup>2-</sup>], [H<sup>+</sup>] and temperature and fitted with experimentally obtained data to generate kinetic rate values of (0.120 ± 0.04, 0.847 ± 0.07, 1.35 ± 0.4) mM<sup>-1</sup> for 40°, 60°, and 75℃, respectively. The reduction of Hg<sup>2+</sup> increases with a temperature increase but shows an inverse relationship with proton concentration. Plotting the model-fitted kinetic rate constants yields ΔH = 61.7 ± 1.82 kJ mol<sup>-1</sup>, which is in good agreement with literature values for the formation of Hg0 by SO<sub>3</sub> <sup>2-</sup>. The model could be used to better understand the overall Hg<sup>2+</sup> re-emission by SO<sub>3</sub> <sup>2-</sup> happening in aquatic systems such as FGD wastewaters.
폐수내 양이온 및 음이온성 중금속을 동시에 제거하는 금속유기물구조체-활성탄 혼합 흡착제 개발
커트루이스솔리스 ( Kurt Louis B. Solis ),권영환 ( Youngwhan Kwon ),김문현 ( Moonhyun Kim ),홍용석 ( Yongseok Hong ) 한국폐기물자원순환학회(구 한국폐기물학회) 2016 한국폐기물자원순환학회 추계학술발표논문집 Vol.2016 No.-
Adsorption using highly porous and highly functionalized sorbents is a straightforward removal technology currently being employed, however the range of contaminants is limited. A novel sorbent was synthesized from activated carbon and Zr-based UiO66 metal organic framework to remove both cationic and oxyanionic metals from aqueous solutions. The composite was characterized using FSEM-EDS, FT-IR, XRD, and TGA, and showed successful integration of UiO66 on the surface of activated carbon. Batch adsorption tests with ICP-OES reveal that the composite has removal efficiency >95% for Pb (II), Cu (II), Se (IV), and As (V). The hybrid material is a promising sorbent for the removal of both cationic and oxyanionic metals for wastewater purification.
KOH activated pine tree needle leaves biochar as effective sorbent for VOCs in water
Theoneste, Nshirirungu,Kim, Moon Hyun,Solis, Kurt Louis,Park, Minoh,Hong, Yongseok Techno Press 2018 Membrane Water Treatment Vol.9 No.5
The removal of volatile organic compounds (VOCs) from water using KOH-activated pine tree needle leaves biochar is considered a cost effective and efficient process. In this study, pine tree needle leaves were mixed with 0, 50, 100 and 200% (KOH weight/feedstock weight) of KOH, respectively. Then, the mixture was pyrolyzed at <TEX>$500^{\circ}C$</TEX> for 6 hrs. The adsorption characteristics of 10 VOCs to the biochar were tested. The results indicated that the removal efficiency of the KOH activated biochar was highest in 100% KOH-biochar. The VOC removal efficiencies of 50% and 200% KOH activated biochar were similar and the 0% KOH activated biochar showed the lowest VOC removal. The FTIR results showed that increasing the amount of KOH seemed to enhance the formation of various functional groups, such as -OH, -C=C, -O. The adsorption strength of 10 VOCs to the KOH activated biochar seemed to be increasing by the increase of the solubility of VOCs. This may suggest that the adsorption is taking place in hydrophilic sites of the biochar surface. The KOH activated pine tree needle leaves biochar can be an effective sorbent for VOCs removal in water and 100% KOH mixing seemed to provide better sorption capacity.