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Adsorption of cationic cetylpyridinium chloride on pyrite surface
배성준,Meherunnesha B. Mannan,이우진 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4
Adsorption of cetylpyridinium chloride (CPC), a cationic surfactant, on pyrite surface was investigated in its suspension. Maximum adsorption capacity of pyrite for CPC was 357 mmol kg-1 in pyrite suspension (4 g L-1) at pH 7 equilibrated with CPC (0.1–1.8 mmol L-1). As CPC adsorption proceeded in the suspension at pH < 7, zeta potential (z) of pyrite surface showed increasing positive values (i.e. 5–18.5 mV at pH 5 and 8.12–26 mV at pH 6). However, at pH 7, it changed from negative to positive value (i.e. -5 to 36 mV at pH 7, -10 to 30 mV at pH 8, and -15 to 20 mV at pH 9), indicating three different isoelectric points at each pH. Adsorption isotherms at suspension pH 5 and 7 with NaCl (0.01 and 0.1 M)showed a decreasing pattern in CPC adsorption capacity. Zeta potential of pyrite surface changed from positive to negative value by the addition of NaCl (21 to -16 mV at pH 5 and 5 to -22 mV at pH 7). This study provides basic understanding of the adsorption mechanism of cationic surfactant on pyrite surface at different pH conditions when surfactant wastewater and contaminated groundwater need to be treated by the reactive iron sulfide.
배성준 한국기록학회 2004 기록학연구 Vol.0 No.9
An Analysis for basic Concepts of The Integrated Management of Records and Archives in China
상단 아치 형상 중실 오스테나이트계 스테인리스강의 2단 인발 공정 최적화
배성준,김정훈,홍성박,홍성규,남궁정,이광석 한국소성∙가공학회 2022 소성가공 : 한국소성가공학회지 Vol.31 No.6
In the automotive industry, cold-drawn austenitic stainless steel is commonly used to handle high fuel pressures in gasoline direct injection (GDI) engines. In this study, we analyzed the effects of main process variables such as cross-sectional shape, drawing speed and friction coefficient on the microstructure, hardness and residual stress of the drawn material in the two-step cold drawing process. By changing the cross-sectional shape in the first-step cold drawing, the possibility of improving the shape accuracy or physical properties of the finally cold-drawn fuel rail pressure sensor product was investigated.