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아연의 수용액 평형과 원자로급 이온교환 수지에 의한 흡착
성기웅,김광락,백승우,김우철 한국공업화학회 2000 응용화학 Vol.4 No.2
Injection of zinc to the reactor water of a nuclear power plant is one of the preventive technologies in order to control the deposition of radionuclides such as ^(60)Co on the system surfaces. Zinc compounds such as zinc oxide, zinc formate and zinc acetate have been proposed and used to evaluate ionic zinc as a means to reduce reactor radiation buildup at several plants. Most of zinc once injected to the reactor water is removed by CVCS demineralizers and only a small portion is incorporated onto the primary system surfaces. From the thermodynamic analysis of the aqueous zinc systems using reliable data, hydrolytic zinc ions are higher than zinc divalent ion at high temperatures. In addition, adsorption behavior of dissolved zinc compounds from aqueous solution on Amberlite ion exchange resin (nuclear grade) has been investigated experimentally using a batch adsorption technique.
나정원,성기웅,김광락,김우철,정흥호 한국공업화학회 1999 응용화학 Vol.3 No.1
A preliminary study on erosion-corrosion of carbon steel with ASTM specification of A106 Grade B and low-alloys with A335 P11(1Cr-1/2Mo) and P22(21/4Cr-1Mo) was carried under aqueous accelerating conditions of pH 8.0±0.3 without dissolved oxygen at 130 ℃ in an erosion-corrosion test loop. The weight losses on the surfaces of A106 carbon steels appeared to be dependent upon flow rate and turbulence intensity. The weight losses on the surfaces of P11 and P22 low-alloy steels, measured after 500 hours, showed approximately half of that of A106 carbon steel.
Lee, Dong-Sung,Ko, Wonmin,Yoon, Chi-Su,Kim, Dong-Cheol,Yun, Jinju,Lee, Jun-Kyung,Jun, Ki-Young,Son, Ilhong,Kim, Dong-Woung,Song, Bong-Keun,Choi, Seulah,Jang, Jun-Hyeog,Oh, Hyuncheol,Kim, Sungchul,Kim, Hindawi Publishing Corporation 2014 Evidence-based Complementary and Alternative Medic Vol.2014 No.-
<P>The brain is vulnerable to oxidative stress and inflammation that can occur as a result of aging or neurodegenerative diseases. Our work has sought to identify natural products that regulate heme oxygenase (HO)-1 and to determine their mechanism of action in neurodegenerative diseases. KCHO-1 is a novel herbal therapeutic containing 30% ethanol (EtOH) extracts from nine plants. In this study, we investigated the antineuroinflammatory effects of KCHO-1 in lipopolysaccharide- (LPS-) treated mouse BV2 microglia. KCHO-1 inhibited the protein expression of inducible nitric oxide synthase (iNOS), iNOS-derived nitric oxide (NO), cyclooxygenase- (COX-) 2, and COX-2-derived prostaglandin E2 (PGE<SUB>2</SUB>) in LPS-stimulated BV2 microglia. It also reduced tumor necrosis factor-<I>α</I> (TNF-<I>α</I>), interleukin-1<I>β</I> (IL-1<I>β</I>), and IL-6 production. This effect was correlated with the suppression of inhibitor of nuclear factor kappa B-<I>α</I> (I<I>κ</I>B-<I>α</I>) phosphorylation and degradation and nuclear factor kappa B (NF-<I>κ</I>B) translocation and DNA binding. Additionally, KCHO-1 upregulated HO-1 expression by promoting nuclear translocation of nuclear factor E2-related factor 2 (Nrf2) in mouse BV2 microglia. Tin protoporphyrin (SnPP), an HO activity inhibitor, was used to verify the inhibitory effects of KCHO-1 on proinflammatory mediators and proteins associated with HO-1 expression. Our data suggest that KCHO-1 has therapeutic potential in neurodegenerative diseases caused by neuroinflammation.</P>
Adsorption of Ionic Zinc on IRN150 Mixed Resin
Kim, Kwang-Rag,Sung, Ki-Woung,Na, Jung-Won,Kim, Uh-Chul 한국공업화학회 2003 응용화학 Vol.7 No.2
Zinc acetate has been proposed and used to evaluate ionic zinc as a mean to reduce reactor radiation buildup at several nuclear plants. Thermodynamic analysis of the aqueous zinc system using reliable data showed that the stability of hydrolyzed zinc species increase with pH and temperature. Batch kinetics and isotherm studies were carried out to investigate the mixed resin performance of zinc adsorption. The equilibrium isotherm of zinc adsorption onto nuclear grade resin show that the data correlate well with Langmuir model and that the adsorption is physical in nature. The adsorption temperature influenced the rate of adsorption. The maximum capacity according to the Langmuir model is about 0.6meq/g for an initial zinc concentration of 100ppm at 50℃.
TiO_2 광촉매를 이용한 Cu(II)-EDTA 의 산화에서 용존산소와 Cu(II)와 EDTA 초기 당량의 영향
정홍호,성기웅,조영현,이영석,최상원 한국환경과학회 2002 한국환경과학회지 Vol.11 No.1
The effects of initial concentration of dissolved oxygen content, Cu(Ⅱ) and EDTA in an aqueous Cu (Ⅱ)-EDTA solution on TiO_2 photo-oxidation of EDTA were investigated using TiO_2 (Degussa P-25) and UV irradiation at 20℃. In the presence of dissolved oxygen and/or Cu(Ⅱ) the photo-oxidation rates of EDTA were enhanced. The rates linearly increased in the range of initial Cu(Ⅱ) concentration below 1.79 mM, while above this concentration those were kept constant. The trend of the EDTA photo-oxidation rates appeared to be akin to the Langmuir-Hinshelwood equation form and the k values calculated were 0.05 mM/min for the free-EDTA system, and 0.17 mM/min for the Cu(Ⅱ)-EDTA system. These meant the aqueous EDTA decomposition was enhanced due to weakening of the intra-molecular bond strength of EDTA by complexation with Cu(Ⅱ) added. It was concluded the decomposition of aqueous EDTA by TiO_2 photo-oxidation was maximum in the presence of dissolved oxygen supplied by air purging and of Cu(Ⅱ) with its concentration for 1:1 Cu(Ⅱ)-EDTA complexation ratio.