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04 포스터 발표 : 대기 환경 분야(PA) ; PA-05 : 산화타이타늄 광 촉매 분해작용에 의한 sulfamethoxazole (SMX)과 그의 산화물의 급성독성 평가
조일규 ( Il Kyu Cho ),조인선 ( In Sun Cho ),설재웅 ( Jae Woong Seol ),간은성 ( Eun Sung Kan ) 한국환경농학회 2015 한국환경농학회 학술대회집 Vol.2015 No.-
The widespread detection of pharmaceutically active compounds, including many synthetic antimicrobial agents, in aquatic environments is raising public health concerns. As a result, there is growing interest in the development of innovative technologies to efficiently transform these compounds to non-toxic and pharmaceutically inactive byproducts. This work examines the photocatalytic degradation of sulfamethoxazole (SMX) and its oxidation products (Hydroxslated SMX, Dihydroxslated SMX and 3-amino 5-methylisoxazole) in aqueous suspensions of nanophase titanium dioxide (TiO2). Experimental results demonstrate that SMX is mineralized by TiO2 irradiated with ultraviolet-A light (UVA: 324≤λ≤400 nm). The acute toxicity of the SMX and its oxidation products were tested using 24 h born Daphnia magna at various dilutions based on the procedure as OECD Guideline 202. The EC50 (%) of 10 mg/kg SMX solution without any photocatalyst (A), 10 mg/kg SMX solution exposed with UV light (B), 10 mg/kg SMX solution exposed with solar light (C) and 10 mg/kg SMX solution treated by solar light with bicarbonate (HCO3 .) as an enhancer for photocatalytic reaction (D) were 74.8, >100.0, >100.0 and 37.5, respectively. The residue of SMX in the A, B, C and D sample were 11.00, <0.05, <0.05 and 5.00 mg/kg, respectively. Hydroxslated SMX, Dihydroxslated SMX and 3-amino 5-methylisoxazole in the samples were detected below the limit of detection (LOD), which was 0.01 mg/kg. Each UV light & solar photocatalyst showed better removal rate than solar photocatalyst treatment with HCO3.