Alvarez P M, Rodríguez E M, Fernández G, Beltrán F J
Departamento de Ingeniería Química y Química Física, Universidad de Extremadura, Avda Elvas S/N, 06071 Badajoz, Spain.
Water Sci Technol. 2010;61(11):2717-22. doi: 10.2166/wst.2010.254.
The photodegradation of the endocrine disrupting chemical Bisphenol A (BPA) under UVA irradiation in the presence of Fe(III) or Fe(III)-polycarboxylate systems was studied. The effect of Fe(III) concentration, aqueous pH and the presence of four carboxylic acids (oxalic, malic, tartaric and citric) were investigated. The Fe(III)/UVA system was able to effectively degrade BPA at pH 3 but failed at pH > 4. At any rate, no mineralization of BPA was achieved with the Fe(III)/UVA system. The presence of carboxylic acids greatly enhanced the BPA degradation rate because of the formation of photoactive Fe(III)-polycarboxylate complexes. Aqueous pH in the 3-7 range exerted a negative effect on the BPA degradation rate and TOC conversion in the presence of oxalic, malic and tartaric acids. Only slight effect of pH was observed in the presence of citric acid, being the BPA degradation rate significant even at pH 7.
研究了在UVA照射下，铁（III）或铁（III）-多羧酸盐体系存在时，内分泌干扰化学物质双酚A（BPA）的光降解情况。研究了铁（III）浓度、水相pH值以及四种羧酸（草酸、苹果酸、酒石酸和柠檬酸）的存在对其的影响。铁（III）/UVA体系在pH 3时能够有效降解BPA，但在pH>4时失效。无论如何，铁（III）/UVA体系都无法实现BPA的矿化。羧酸的存在极大地提高了BPA的降解速率，这是由于形成了光活性的铁（III）-多羧酸盐配合物。在草酸、苹果酸和酒石酸存在的情况下，3-7范围内的水相pH值对BPA降解速率和TOC转化率产生负面影响。在柠檬酸存在的情况下，仅观察到pH值有轻微影响，即使在pH 7时BPA降解速率也很显著。
