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수열 합성법에 의한 Zinc Oxide의 제조 및 Tartrazine 분해 특성
나석은 ( Seok Eun Na ),정상구 ( Sang Gu Jeong ),정갑섭 ( Ga Seop Jeong ),김시영 ( Si Young Kim ),주창식 ( Chang Sik Ju ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.6
암모니아수와 zinc acetate로부터 액상 수열합성법에 의한 ZnO의 제조에 있어 반응온도, 반응물의 농도와 혼합방법, 용액의 pH 등 반응조건에 따른 ZnO 입자의 형상과 입자분포 등 제조특성을 고찰하고, UV 조사하에 tartrazine의 광분해를 측정하여 합성된 ZnO의 광촉매로서의 성능을 확인하였다. 반응용액의 pH가 높을수록 ZnO 입자의 평균 크기는 증가하였고, zinc acetate의 농도가 증가할수록 그리고 반응온도가 증가할수록 입자의 크기는 감소하였다. 반응용액의 혼합시 암모니아수 주입 후에 zinc acetate를 첨가하였을 경우 더 작은 입자를 얻을 수 있었다. 최소 크기의 ZnO 입자의 생성을 위한 최적 조건은 용액의 pH 11.2, zinc acetate의 농도 0.6 M, 반응온도 90℃ 였으며, 입자 평균크기는 3.133 μm이었다. 합성온도 80 ℃, zinc acetate 농도 1.0M 및 반응용액의 pH 11.2의 조건에서 합성된 ZnO에 의한 tartrazine의 광촉매 분해는 분해시간 60분에서 약 97%의 분해율을 보였다. The effects of reaction temperature, reactant concentration, pH of solution and mixing order of reactants on the particle shape and size distribution of zinc oxide were investigated in the preparation of zinc oxide from ammonium hydroxide and zinc acetate by the method of aqueous hydrothermal precipitation method, and the photocatalytic ability of zinc oxide synthesized was measured from the degradation of tartrazine under UV irradiation. The average particle size was increased with pH of solution but decreased with zinc acetate concentration and reaction temperature. The optimum condition for the synthesis of minimum sized zinc oxide was pH 11.2, concentration of zinc acetate 0.6 M and reaction temperature 90 ℃, and its average particle size was 3.133 μm. 97% of tartrazine was degraded by zinc oxide in sixty minutes.
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정갑섭 ( Kap-seop Jeong ),나석은 ( Seok-eun Na ) 한국고등직업교육학회 2003 한국고등직업교육학회논문집 Vol.4 No.4
The characteristics of photocatalytic degradation of dyes with zinc oxide suspension was studied in a batch reactor under constant strength ultra-violet ray. Zinc oxide was more effective photocatalyst than titanium dioxide in degradation of water soluble dyes. The degradation rate was increased with increasing the oxidant concentration, but didn't show manifest difference with initial pH of solution. The degradation rate of methyl orange, eosin Y and rhodamine B was pseudo-first order, and was in order of rhodamine B>methyl orange>eosin Y with photocatalytic rate constants 0.067min-1, 0.058min-1 and 0.048min-1 for rhodamine B, methyl orange and eosin Y, respectively.
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UV/TiO<sub>2</sub>공정을 이용한 수중 Tartrazine의 광촉매 분해
정갑섭 ( Kap-seop Jeong ),나석은 ( Seok-eun Na ),이화수 ( Hwa-soo Lee ) 한국고등직업교육학회 2004 한국고등직업교육학회논문집 Vol.5 No.2
The characteristics of photocatalytic degradation of tartrazine(abbreviated to TTZ) using UV/TiO<sub>2</sub> process was studied in a batch reactor under constant strength of ultra-violet ray; effects of the initial concentration of TTZ, effects of dosage and structural form of TiO<sub>2</sub>, effects of oxidants, effects of initial pH of TTZ aqueous solution on the removal of TTZ. The degradation rate was increased with decreasing pH and initial concentration of TTZ, and with the increasing dosage of TiO<sub>2</sub> and oxidant. Anatase structure of TiO<sub>2</sub> was more effective than rutile one below the dosage of 1g. KBrO<sub>3</sub> was more effective oxidant than (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub>. The photocatalytic degradation rate of TTZ was pseudo-first order with rate constants of 0.011, 0.025, 0.035 and 0.058min<sup>-1</sup> at 0.1, 0.5, 1.0 and 5.0g dosage of anatase TiO<sub>2</sub>, respectively.
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Pd/SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> 촉매상에서 아크로레인과 암모니아로 부터 피리딘과 β-피콜린의 합성
천승우,최정근,오석연,나석은,박대원,Chun, Sung-Woo,Choi, Jung-Kun,Oh, Seok-Youn,Na, Suk-Eun,Park, Dae-Won 한국공업화학회 1991 공업화학 Vol.2 No.2
실리카-알루미나에 담지된 팔라듐 촉매를 제조하여 아크로레인과 암모니아로부터 피리딘과 ${\beta}$-피콜린의 합성반응에 사용하였다. 시간이 경과함에 따라 촉매표면에 생성된 침적물에 의하여 촉매의 활성이 크게 감소하였다. TPR 실험 결과 이 침적물은 아크로레인과 암모니아의 축합 중합에 의하여 생성됨을 알 수 있었다. 전화율과 피리딘 및 ${\beta}$-피콜린의 생성속도는 아크로레인의 분압이 증가할수록 감소하였다. 침적물의 양과 촉매재생 온도는 아크로레인의 분압에 따라 증가하였으나 암모니아의 분압에는 큰 영향을 받지 않았다. $Pd/SiO_2-Al_2O_3$ catalysts were prepared for the synthesis of pyridine and ${\beta}$-picoline from acrolein and ammonia. The activity of these catalysts decreased considerably by the formation of deposits on catalyst surface during the reaction. TPR study showed that the deposits were formed by the condensation polymerization of acrolein and ammonia. The conversion and production rate of pyridine and ${\beta}$-picoline decreased with the partial pressure of acrolein. The amount of deposits and the regeneration temperature of spent catalysts increased with the partial pressure of acrolein but they were independent of the concentration of ammonia.
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Pb / SiO2 - Al2O3 촉매상에서 아크로레인과 암모니아로 부터 피리딘과 β- 피콜린의 합성
천승우,최정근,오석연,나석은,박대원 ( Sung Woo Chun,Jung Kun Chun,Seok Youn Oh,Suk Eun Na,Dae Won Park ) 한국공업화학회 1991 공업화학 Vol.2 No.2
실리카-알루미나에 담지된 팔라듐 촉매를 제조하여 아크로레인과 암모니아로 부터 피리딘과 β-피콜린의 합성반응에 사용하였다. 시간이 경과함에 따라 촉매표면에 생성된 침적물에 의하여 촉매의 활성이 크게 감 소하였다. TPR실험 결과 이 침적물은 아크로레인과 암모니아의 축합 중합에 의하여 생성됨을 알 수 있었다. 전화율과 피리딘 및 β-피콜린의 생성속도는 아크로레인의 분압이 증가할수록 감소하였다. 침적물의 양과 촉매 재생 온도는 아크로레인의 분압에 따라 증가하였으나 암모니아의 분압에는 큰 영향을 받지 않았다. Pd/SiO_2-Al_2O_3 catalysts were prepared for the synthesis of pyridine and β-picoline from acrolein and ammonia. The activity of these catalysts decreased considerably by the formation of deposits on catalyst surface during the reaction. TPR study showed that the deposits were formed by the condensation polymerization of acrolein and ammonia. The conversion and production rate of pyridine and β-picoline decreased with the partial pressure of acrolein. The amount of deposits and the regeneration temperature of spent catalysts increased with the partial pressure of acrolein but they were independent of the concentration of ammonia.
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정상구 ( Sang Gu Jeong ),나석은 ( Seok Eun Na ),김시영 ( Si Young Kim ),주창식 ( Chang Sik Ju ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.5
Photocatalytic zinc oxide powders were prepared from precursor zinc acetate and ammonia solution at elevated temperature, 80˚C, by hydrothermal precipitation method. The effect of operating parameters, pH of ammonia solution and concentration of zinc acetate solution, on the characteristics of zinc oxide powders were experimentally examined. Zinc oxide powders prepared at the conditions of pH 11, zinc acetate concentration of 1.0 M, precipitation temperature of 80˚C, showed smallest average particle diameter of 3 um. SEM and XRD analysis confirmed that prepared zinc oxide has hexagonal rods structure, and Anatase type crystallinity. In addition, DRS and PL analysis showed that the zinc oxide has activity at the range of 200~400 nm of UV light. And the zinc oxide decomposed 57% of a food color stamp Brilliant blue FCF for 3 hours under the UV radiation.
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주창식,이경옥,정성옥,박흥재,나석은,정갑섭 한국환경과학회 2001 한국환경과학회지 Vol.10 No.5
The characteristics of precipitation separation and solvent extraction separation of magnesium from the waste bittern were studied experimentally. In the result of precipitation separation, the size of magnesium hydroxide precipitated was not affected on pH, but decreased with increasing the precipitation temperature. The purity of magnesium oxide precipitated was increased with pH beyond pH 11. From the solvent extraction separation, the equilibrium extraction ratio of magnesium was increased with pH and temperature of extraction phase, the concentration of stripping phase, and with decreasing pH of stripping phase. The extractant of Aliquat 336 and Acid 810 mixture was more effective than that of DCH18C6 and D_2EHPA mixture in the extraction separation of magnesium.
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