【摘要】 活化PS(过硫酸盐)氧化工艺对于降解水中新兴微污染物具有潜在应用价值.为研究活化PS体系对BPs(二苯甲酮类)有机防晒剂的降解性能,以BP4(二苯甲酮-4)为研究对象,采用UV/PS(紫外活化过硫酸盐)工艺降解BP4,比较单一UV、单一PS和UV/PS 3种工艺对BP4的去除效果,考察各因素对UV/PS工艺去除BP4动力学的影响,同时探究BP4降解机理并进行风险评价.结果表明:BP4降解过程符合准一级反应动力学模型;最佳PS投加量为1. 0 mmol/L,反应30 min后BP4去除率可达94%,增加PS投加量或降低初始c(BP4)均可促进BP4降解,无机阴离子(HCO3-和Cl-)对BP4降解均有抑制作用,酸性条件有利于BP4降解;基于HPLC-MS/MS鉴定出8种中间产物,并提出降解路径,费氏弧菌毒性试验和ECOSAR v1. 10软件预测表明,UV/PS工艺降解BP4过程中生成的中间产物比母物质毒性更高.研究显示,UV/PS工艺可有效去除BP4,但其中间产物可能会造成潜在的生态风险,后续需进一步深入研究.更多还原

【Abstract】 Activated persulfate( PS) oxidation process has the potential application value for the degradation of emerging micro pollutants(EMs) in water. BP4(benzophenone-4) was selected as a representative benzophenone compound. The degradation of BP4 by UV alone,PS alone and UV/PS( UV-activated persulfate) process was compared. The effects of the process parameters were further investigated. The degradation mechanisms and risk assessment of BP4 degradation were also discussed. The results showed that the pseudo-first-order kinetics model fit the BP4 degradation data well. With the optimal dose of 1. 0 mmol/L PS,the removal of BP4 reached 94% in 30 min by UV/PS process. The increasing PS dose and the decreasing initial BP4 molar concentration could accelerate the degradation of BP4. The presence of HCO3-and Cl-had an inhibition effect on BP4 degradation,while acidic conditions were favorable for BP4 degradation. Eight degradation intermediates of BP4 were identified by HPLC-MS/MS,and the degradation pathway was also proposed. Luminescent bacteria toxicity test and ECOSAR v1.10 software prediction revealed that the potential aquatic toxicity of the intermediates was significantly higher than that of the parent BP4. In summary,the UV/PS process could effectively remove BP4 in water. However,the intermediates generated during the UV/PS process may still pose potential risks,and need to be further investigated.更多还原