钢渣碱活化过硫酸盐降解双酚A

通过钢渣水解后产生的碱性溶液活化过硫酸盐（PS）降解水中的双酚A（BPA），考察了钢渣、过硫酸钾投加量对体系降解能力的影响.结果表明，在25℃，当投加3g/L钢渣以及2g/L过硫酸钾时，浓度50μg/L的BPA溶液可在1h后被降解72%.扫描电镜、X射线衍射分析及X射线荧光分析表征反应前后的钢渣，结果表明反应后钢渣的CaO及FeO含量均下降.自由基淬灭实验结果表明体系中同时存在O₂^·-，SO₄^·-和·OH 3种活性氧物种，对BPA降解的贡献分别占68.97%，9.52%和21.51%.在自来水中由于含有HCO₃^-水解过程而使降解效率升高，在市政废水出水中由于其他有机污染物对活性氧物种的竞争湮灭而使降解效率降低.机理推断认为，钢渣活化K₂S₂O₈体系中，自由基的生成由两类反应共同实现，除碱活化过程外还包含少量的氧化亚铁催化过程.LC/MS结果表明BPA的降解产物主要包括二羟基的醌及羧酸类物质.

Bisphenol A degradation by base-activated persulfate using steel slag

Steel slag was firstly employed as a solid activator for a peroxydisulfate activation system, in which the degradation efficiency of BPA was evaluated. About 74% of BPA(50 μg/L) can be effectively removed within 1 hour under the adopted condition (peroxydisulfate]₀=2g/L,Steel Slag]=3g/L, T=25℃). The components and surface morphology of unused and recycled steel slag were analyzed by scanning electron microscopy, X-ray diffraction and X-ray fluorescence, demonstrating the gradual decrease of CaO and FeO. Radical scavenger studies confirmed that all of the O₂^·-, SO₄^·- and ·OH contributed to the BPA degradation with the contribution of 68.97%, 9.52% and 21.51%, respectively. The degradation efficiency was enhanced in tap water due to the existence of HCO₃^- and was weakened in municipal wastewater effluent due to the radical scavenge by other organics. A redox mechanism was proposed and claimed that both the base oxides and iron oxides of steel slag were responsible for the peroxydisulfate activation. The degradation products of BPA included quinone and carboxylic acid, which were identified by LC/MS.