| Abstract |
| TiO2 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/TiO2 system. In this research, the characteristics of photocatalytic degradation of humic acid, one of natural organic matter(NOM), by UV-LED/TiO2 system were evaluated. To obtain the optimum operating conditions for the effective humic acid decomposition, rate of inflow (50-800 mL/min), TiO2 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 UV254 reduction rate. The results of NOM decomposing characteristics evaluation in UV-LED/TiO2 advanced oxidation process (AOP), rate of inflow 200 mL/min, TiO2 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/TiO2 advanced oxidation process in field application need to proceeded. |
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| Key Words |
| Advanced oxidation process, Natural organic matter, Photocatalyst, TiO2, UV-LED |
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