以典型内分泌干扰物双酚A(BPA)为目标污染物,研究了高铁酸钾[Fe(Ⅵ)]对其的去除效果及机理。通过高效液相色谱仪、离子色谱仪等手段考察了pH、Fe(Ⅵ)投加量和共存离子等因素对BPA去除效果的影响。结果表明,在pH为8.0、Fe(Ⅵ)与BPA浓度比为30:1时,反应10 min后BPA的降解率达到81.5%。Cl^-、SO^2-₄、NO^-₃、HCO^-₃等共存阴离子未影响 Fe(Ⅵ)体系的氧化能力,但Ca²⁺和Mg²⁺因加速了Fe(Ⅵ)自分解而抑制了BPA降解。通过淬灭实验对体系中的活性氧物种进行识别,Fe(Ⅵ)及其高价铁氧中间体Fe(Ⅴ)/Fe(Ⅳ)在氧化BPA中起主导作用。在实际水体(自来水、市政二级出水和地下水)中,Fe(Ⅵ)氧化体系对BPA的降解未受到明显影响,证实其具有较高的环境适应性。

The removal effect and mechanism of potassium ferrate (Fe(Ⅵ)) on bisphenol A (BPA),a typical endocrine disruptor chemical substance,are studied.The effects of pH value,Fe(Ⅵ) dosage,and coexisting ions on the removal efficiency of BPA are investigated through using high-performance liquid chromatography (HPLC),ion chromatography,and other measurements.The results show that the degradation rate of BPA reaches 81.5% after 10 minutes of reaction at a pH of 8.0 and a Fe(Ⅵ) to BPA concentration ratio of 30:1.The co-existed anions including Cl^-,SO^2-₄,NO^-₃ and HCO^-₃ exert negligible effect on the oxidation ability of Fe(Ⅵ) system,while Ca²⁺ and Mg²⁺ both accelerate the self-decomposition of Fe(Ⅵ) and therefore suppress the degradation of BPA.The reactive oxygen species in the system are identified through quenching experiments,and Fe(Ⅵ) and its intermediate high valence product Fe(Ⅴ)/Fe(Ⅳ) play a dominant role in the oxidation of BPA.In some real water bodies (tap water,municipal secondary effluent,and groundwater),no obvious negative effects on degradation of BPA by Fe(Ⅵ) oxidation system have been observed,indicating a high adaptability.

林洋仟(1997-),男,硕士生,主要从事水体新兴污染物处理技术研究,20212210114@stu.kust.edu.cn;杨学珂(1989-),男,本科,高级工程师,主要从事饮用水水质提升研究,通讯联系人,2590356434@qq.com。