紫外-高铁酸钾联合氧化处理水中双酚A的研究

The degradation efficiency of bisphenol A in water by UV combined potassium ferrate system

采用254 nm紫外光活化高铁酸钾[UV/Fe(Ⅵ)],探究其对水溶液中双酚A(BPA)的降解效能,对体系中主要的活性组分进行了鉴定,提出了BPA可能的降解路径。结果表明,UV/Fe(Ⅵ)协同降解BPA符合二级动力学,其降解速率比UV和Fe(Ⅵ)分别提升了98.94%和67.17%。当BPA浓度为220μmol/L,Fe(Ⅵ)浓度为50μmol/L,体系温度25℃,pH 6时,BPA的去除率达到了91.46%。温度和pH的升高、腐殖酸和CO_(3)^(2-)的存在,可以提升BPA的降解速率。UV/Fe(VI)体系起主导作用的活性组分为Fe(V)、Fe(IV)、超氧自由基和羟基自由基。去甲基化、羟基化和开环反应是BPA的主要降解路径。

The degradation efficiency of bisphenol A(BPA)in aqueous solution was investigated in UV 254 nm combined with potassium ferrate[UV/Fe(Ⅵ)]process.The main active components for BPA oxidation were identified,and the possible degradation pathways of BPA were also proposed.The results showed that the synergistic degradation of BPA in UV/Fe(Ⅵ)process followed the pseudo second-order kinetics,and its degradation rate was enhanced by 98.94%and 67.17%compared with single UV and Fe(Ⅵ),respectively.The removal rate of BPA reached 91.46%when the BPA concentration was 220μmol/L,Fe(Ⅵ)concentration was 50μmol/L,the system temperature was 25℃and pH 6.Increasing temperature and pH,the presence of humic acid and CO 2-3 can enhance the degradation efficiency.The dominated reactive oxidation species in UV/Fe(Ⅵ)system were Fe(V),Fe(IV),superoxide radicals and hydroxyl radical.The degradation of BPA mainly underwent the demethylation,hydroxylation and ring opening reactions in UV/Fe(Ⅵ)system.