Study of the Degradation of Trimethoprim Using Photo-Fenton Oxidation Technology
Wang, Qi | Pang, Wenjing | Mao, Yingdan | Sun, Quan | Zhang, Pengfei | Ke, Qiang | Yu, Hengguo | Dai, Chuanjun | Zhao, Min
Trimethoprim is one of the representative drugs within the pharmaceutical and personal care products (PPCPs) group. The photo-Fenton oxidation technology was used to degrade trimethoprim in wastewater and the extent of degradation was analyzed by using high-performance liquid chromatography, then experimentally obtained the optimal conditions. Analysis of the experimental data showed that, under the single-factor experimental conditions, the optimal conditions for degradation were a pH of 4, an H<inf>2</inf>O<inf>2</inf> concentration of 3.0 mmol/L, an FeSO<inf>4</inf> concentration of 0.06 mmol/L, an initial trimethoprim concentration of 0.0689 mmol/L, and an ultraviolet (UV) intensity (UVA) of 12 mW/cm2. The interaction of pH and the concentration of H<inf>2</inf>O<inf>2</inf> and Fe2+ have been further explored, it was obtained the following response surface results through the central composite design experiment: pH = 4.56, H<inf>2</inf>O<inf>2</inf> concentration = 0.09 mmol/L, and Fe2+ concentration = 0.09 mmol/L. Under these conditions, it can be obtained a degradation rate of 99.95% after 6 min. There were similar results for three sets of parallel experiments, indicating that these simulation conditions were feasible.
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