São Carlos Institute of Chemistry, University of São Paulo, P.O. Box 780, CEP 13560-970 São Carlos, SP, Brazil.
Department of Chemistry, University Federal of São Carlos, P.O. Box 676, CEP 13560-970 São Carlos, SP, Brazil.
Chemosphere. 2014 Aug;109:187-94. doi: 10.1016/j.chemosphere.2014.02.018. Epub 2014 Mar 7.
The electrooxidation of the dimethyl phthalate (DMP) ester was galvanostatically carried out in a filter-press reactor using a fluoride-doped lead dioxide (β-PbO2,F) film electrodeposited on a Ti substrate. The variables investigated were the nature of the supporting electrolyte (NaCl and Na2SO4), pH (3, 7, and 10), current density (10, 20, 40, 60, and 80mAcm(-2)), and temperature (10, 20, 30, 40, and 50°C). The removal of DMP was monitored through high performance liquid chromatography (HPLC) and total organic carbon (TOC) analysis. The best conditions were obtained using Na2SO4 and at low current densities, independent of the solution pH or temperature. These conditions led to the highest levels of current efficiencies and complete combustion. However, the TOC removal levels were low, due to the generation of highly oxidized intermediates, which was confirmed by the intermediates detected by HPLC.
采用氟掺杂二氧化铅（β-PbO2,F）薄膜电极在加压过滤反应器中，对邻苯二甲酸二甲酯（DMP）酯进行恒电流电化学氧化。考察了支持电解质（NaCl 和 Na2SO4）的性质、pH 值（3、7 和 10）、电流密度（10、20、40、60 和 80mAcm(-2)) 和温度（10、20、30、40 和 50°C）等变量对 DMP 去除的影响。通过高效液相色谱（HPLC）和总有机碳（TOC）分析监测 DMP 的去除。结果表明，在低电流密度下，无论溶液 pH 值或温度如何，使用 Na2SO4 作为支持电解质时，可获得最佳的去除效果。这些条件导致了最高的电流效率和完全燃烧，但 TOC 的去除水平较低，这是由于生成了高度氧化的中间产物，这一点通过 HPLC 检测到的中间产物得到了证实。
