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유기산에 의한 인듐스크랩에서 고순도 인듐옥살산염의 제조
구수진 ( Su Jin Koo ),주창식 ( Chang Sik Ju ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.6
Effect of organic acid on the preparation of indium-oxalate salt from indium scraps generated from ITO glass manufacturing process was studied. Effects of parameters, such as type and concentration of organic acids, pH of reactant, temperature, reaction time on indium-oxalate salt preparation were examined. The impurity removal efficiency was similar for both oxalic acid and citric acid, but citric acid did not make organic acid salt with indium. The optimum conditions were 1.5 M oxalic acid, pH 7, 80 ℃, and 6 hours. On the other hand, the recoveries increased with pH, but the purity decreased. The indium-oxalate salt purity prepared by two cycles was 99.995% (4N5). The indium-oxalate salt could be converted to indium oxide and indium metal by substitution reaction and calcination.
인산-산성불화암모늄-킬레이트제 혼합용액에 의한 폐태양전지로부터 실리콘웨이퍼의 회수
구수진 ( Su Jin Koo ),주창식 ( Chang Sik Ju ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.6
Recovery method of silicon wafer from defective products generated from manufacturing process of silicon solar cells was studied. The removal effect of the N layer and antireflection coating (ARC) of the waste solar cell were investigated at room temperature (25 oC) by variation of concentration of H3PO4, NH4HF2, and concentration and types of chelating agent. Removal efficiency was the best in the conditions; 10 wt% H3PO4 2.0 wt% NH4HF2, 1.5 wt% Hydantoin. Increasing the concentration of H3PO4, the surface contamination degree was increased and the thickness of the silicon wafe became thicker than the thickness before surface treatment because of re-adsorption on the silicon wafer surface by electrostatic attraction of the fine particles changed to (+). The etching method by mixed solution of H3PO4- NH4HF2-chelating agents was expected to be great as an alternative to conventional RCA cleaning methods and as the recycle method of waste solar cells, because all processes are performed at room temperature, the process is simple, and less wastewater, the removal efficiency of the surface of the solar cell was excellent.
TTA와 TOPO를 이용한 수용액 중의 리튬이온 용매추출
주창식 ( Chang Sik Ju ),이전규 ( Jeon Kyu Lee ),정상구 ( Sang Gu Jeong ),구수진 ( Su Jin Koo ),김시영SiYoungKim 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.1
For the purpose of development of the extraction process of lithium ion from concentrated water eliminated from desalination process, an experimental research on the solvent extraction of lithium ion from aqueous solutions was performed. The effects of operating parameters, such as concentration of extractant, ratio of extracting solution/aqueous solution, pH of aqueous solution, were examined. The effect of sodium chloride, the major component of sea water, was also examined. Lithium ion in aqueous solutions of pH=10.2~10.6 adjusted by ammonia solution was most effectively extracted by extracting solution composed of 0.02 M TTA and 0.04 M TOPO in kerosine. The addition of sodium chloride in lithium aqueous solution significantly interfered the extraction of lithium ion.
수열합성법에 의한 광촉매 제조 및 Brilliant Blue FCF 분해 성능
김석현 ( Seok-hyeon Kim ),정상구 ( Sang-gu Jeong ),나석은 ( Seok-en Na ),구수진 ( Su-jin Koo ),주창식 ( Chang-sik Ju ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.2
Experimental research on the preparation of photocatalyst for the decomposition of brilliant blue FCF(C_{37} H_{31} O_{9}N₂S₃Na₂) was performed. TiO₂ and ZnO powders were prepared from titanium (IV) sulfate and zinc acetate at low reaction temperature and atmospheric pressure by hydrothermal precipitation method without calcination. In addition, TiO₂ was prepared with cationic surfactant CTAB (Hexadecyltrimethyl ammonium bromide) at the same conditions. The physical properties of prepared TiO₂ and ZnO, such as crystallinity, average particle size and absorbance, were investigated by XRD, Zeta-potential meter and DRS. And, the photocatalytic degradation of brilliant blue FCF has been studied in the batch reactor under UV radiation. For the photocatalysts prepared without CTAB, TiO₂ has smaller particle size and larger absorbance and photocatalytic reaction rate than ZnO. And TiO₂, prepared with CTAB whose concentration is 1/10 of that of precursor, shows 15% higher than that prepared without CTAB in final photocatalytic degradation ratio of brilliant blue FCF.