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강전택,정기호 한국환경과학회 2000 한국환경과학회지 Vol.9 No.4
The hydroxyapatite (HAp) for the present study was prepared by precipitation method in semiconductor fabrication and the crystallized at ambient to950℃ for 30min in electric furnace. The ion-exchange characteristics of HAp for various heavy metal ions such as Cd^2+, Cu^2+, Mn^2+, Zn^2+, Fe^3+, Pb^2+, Al^3+, and Cr^6+ in aqueous solution has been investigated. The removal ratio of various metal ions for HAp were investigated with regard to reaction time, concentration of standard solution, amount of HAp and pH of solution. The order of the ions exchanged amount was as follows: Pb^2+, Fe^3+>Cu^2+>Zn^2+>Al^3+>Cd^2+>Mn^2+>Cr^6+. The Pb^2+ ion was readily removed by the HAp, even in the strongly acidic region. The maximum amount of the ion-exchange equilibrium for Pb^2+ ion was about 45 ㎎/gram of HAp. The HAp would seem to be possible agent for the removal of heavy metal ions in waste water by recycling of waste sludge in semiconductor fabrication.
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강전택,정기호 한국환경과학회 2001 한국환경과학회지 Vol.10 No.6
The hydroxyapatite(HAp) as a carrier the for ion exchange agent of Ag^+ions was prepared in semiconductor fabrication, The Ca/P molar ratio of the HAp was 1.65. The HAp is molded in shape of the antimcrobial ball and then sintered at 1000℃. Ag-containing HAp(HAp-Ag) was prepared by incorporating Ag^+ions in HAp crystals through an ion-exchange reaction in solutions containing 0.01M AgNO_3. The antimicrobial effect of HAp-Ag for bacteria such as Escherichia coli and Staphylococcus aureus has been investigated. The concentrations of silver in the antimicrobial ball was determined by inductively coupled plasma and the amount of Ag^+ion was 9.0㎍/g. The HAp-Ag exhibited excellent antimicrobial effect for bacteria such as E. coli and S. aureus. The bactericidal activity was considered to be caused by direct contact of bacteria with Ag^+ions in the HAp crystals. The HAp would likely to be possible as a carrier of antimicrobial metal ions such as Ag, Cu, and Zn by recycling of waste sludge in the semiconductor fabrication process.
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반도체 제조공정의 폐수슬러지로 합성된 Hydroxyapatite를 이용한 인산이온의 흡착
강전택,정기호,신학기 한국환경과학회 2002 한국환경과학회지 Vol.11 No.3
The hydroxyapatite(HAp) for the present study was prepared with the wastewater sludge from semiconductor fabrication process and it was crystallized in an electric furnace for 30 min at 900℃. The adsorption characteristics of HAp for phosphate ion in aqueous solution has been investigated. The adsorbed ratio of phosphate ion for HAp were investigated according to the reaction time, amount of HAp, concentration of standard solution, pH of solution, and influence of concemitant ions. The amount of adsorbed phosphate ion decreased with the increase of pH due to the mutual electrostatic repulsion between adsorbed phosphate ions and competitive absorption between phosphate ion and OH- ion in aqueous solution. The maxium amount of the adsorption equilibrium for phosphate ion was about 24 ㎎/g of HAp. The HAp would likely to be a possible absorbent for the removal of phosphate ion in the waste water.
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고성능 액체 크로마토그래피에 의한 지방족 화합물의 간접 분광광도 측정에 관한 연구
강삼우,강전택,Sam-Woo Kang,Jeon-Tag Kang 대한화학회 1989 대한화학회지 Vol.33 No.4
고성능 액체 크로마토그래피에 있어서 지방족 화합물인 알코올 케톤 및 에스테르의 간접 분광광도 측정에 관하여 조사하였다. 비발색단 또는 약한 발색단을 가지고 있는 이들 시료들은 검출시약으로 UV 흡수물질인 p-클로로페놀 또는 p-니트로페놀을 이동상에 첨가하므로 UV 검출기로서 간접적으로 검출할 수 있었고 검출한계로 Submicrogram 수준까지 얻을 수 있었다. 또한 최적조건하에서 몇가지 혼합시료들을 좋은 분리도와 비교적 높은 감도로서 분리 및 정량할 수 있었다. Indirect photometric detection of aliphatic compounds such as alcohols, ketones and esters was investigated in high-performance liquid chromatography, These samples possessing nonchromophore or weak chromophore could be indirectly detected by a UV detector with addition of UV absorbing, p-chlorophenol or p-nitrophenol in mobile phase as detection reagent, and submicrogram detection limits were achieved. Some mixtures of samples were also able to be separated and quantitated with good resolution and comparatively high sensitivity under optimum conditions.
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