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중금속 제거를 위한 폴리프로필렌 소재 코팅에 관한 연구 : 불투수면 유출수 처리
오혜철,박민호,이동석 강원대학교 산업기술연구소 2007 産業技術硏究 Vol.27 No.A
This research was done for possible treatment of impermeable surfaces rainwater runoff containing heavy metal ions by manganese oxide coated on polypropylene support. Manganese oxide was coated by Birnessite Coating Methods(BCM)and the coating analyzed by SEM and FT-IR techniques. The efficiency of heavy metal ions adsorption was also assessed via both batch and column tests. Adsorption efficiencies of Cd, Zn, Cu, and Pb were 99.4%, 98.9%, 96.7%, and over 95.7%, respectively. The adsorption progress pattern reveals quite fast adsorption at initial periods of treatment and change to slower rates at later times.
고순도 TiO2 나노결정에 의한 휴믹산의 광촉매 분해 특성
오혜철 ( Hye Cheol Oh ),이동석 ( Dong Seok Rhee ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.4
High purity TiO2 nanocrystals (rod shape, ≤ 100 nm) were synthesized from TTIP/H2O2/H2O systems, and utilized as photocatalysts for degradation of humic acid (HA) in the aqueous solution. The high purity TiO2 nanocrystals were obtained by excluding the use of inorganic acids that might consequently cause contamination of active catalytic surface sites of the nanocrystals by Cl-, NO3- and SO42-. Particle size and crystallinity of the nanocrystals were increased with progressing the refluxing time 1~9 h at 120℃ in an oil bath. By varying H2O2/Ti = 5.5~55, the crystalline phase of anatase/rutile ratio of the nanocrystals was controllable. The photocatalytic properties of the nanocrystals were strongly dependent upon the crystallinity and particle size. The dissolved organic carbon (DOC) removal of humic acid was most effective for the nanocrystals prepared at H2O2/Ti = 5.5 due to the mixed crystalline phase of anatase/rutile and the increased surface area by smaller particle size. The decreases of UV254 absorbance of HA solutions, which is caused by the conjugate double bond breakage, were much faster than those of DOC, and not so dependent upon the variations of TiO2 nanocrystals.
UV-LED/TiO<sub>2</sub> 고도산화공정을 이용한 천연유기물질 분해
오혜철 ( Hye-cheol Oh ),김석구 ( Seog-ku Kim ),이동석 ( Dong-seok Rhee ) 한국수처리학회 2017 한국수처리학회지 Vol.25 No.5
TiO<sub>2</sub> has been used as a clean and non-toxic photocatalyst for mineralization of natural organic matter, and also well known as an effective photocatalyst for treatment of various pollutants such as trihalomethanes (THMs), organic acids, heavy metals, pesticides, microorganism, and NOx etc. This study was evaluated to photocatalytic degradation of humic acid by UV-LED/TiO<sub>2</sub> system. In this research, the characteristics of photocatalytic degradation of humic acid, one of natural organic matter(NOM), by UV-LED/TiO<sub>2</sub> system were evaluated. To obtain the optimum operating conditions for the effective humic acid decomposition, rate of inflow (50-800 mL/min), TiO<sub>2</sub> concentrations (0-2000 mg/L) and initial pH (3-11) were varied in each experiments. Humic acid solution was collected every hour for analyzing pH changes, DOC removal rate and UV<sub>254</sub> reduction rate. The results of NOM decomposing characteristics evaluation in UV-LED/TiO<sub>2</sub> advanced oxidation process (AOP), rate of inflow 200 mL/min, TiO<sub>2</sub> concentration of 1,000 mg/L and initial pH of 7 showed the highest photocatalyst decomposition efficiency which considered to be applicable for water treatment. Further researches of finding the optimum operating conditions of UV-LED/TiO<sub>2</sub> advanced oxidation process in field application need to proceeded.