热活化过硫酸盐对双酚A的降解及其机理

Degradation efficiency and mechanism of bisphenol A by thermally activated persulfate

研究了热活化过硫酸盐对双酚A的氧化降解效能及机理,探讨了温度,反应物初始浓度,p H值,阴离子和腐殖酸对双酚A降解的影响。结果表明:在实验范围内,双酚A的降解率随温度和过硫酸钠初始浓度的升高而增加;双酚A在酸性条件下的降解率比在中性和碱性条件下要高;阴离子的存在会抑制溶液中双酚A的降解,抑制作用依次为SO2-4>Cl->NO-3;加入腐殖酸后,双酚A的降解受到抑制。双酚A的降解中间产物主要为对苯二酚、对异-丙烯基苯酚、2-甲基-2,3-二氢苯并呋喃和3-甲基-2,3-二氢苯并呋喃。

In this study,by exploiting the outstanding oxidative capacity of thermally activated persulfate,we examined the efficacy and mechanisms of bisphenol A（ BPA） removal by S2O2-8. Reaction conditions such as temperature,initial concentration of persulfate solution,p H value,anions（ Cl-,NO-3,SO2-4）,and humic acid concentration were tested. The results showed that BPA degradation rate increased with an increase in temperature and initial persulfate concentration. An acidic reaction solution,instead of a neutral and alkaline reaction solution,can accelerate the reaction. While humic acid showed negligible inhibition of BPA removal,coexisting anions displayed suppressive effects,and the inhibitive capacity decreased in the following order： SO2-4 Cl-NO-3. A total of four compounds,hydroquinone,p-isopropenyl phenol,2-methyl-2,3-dihydrobenzofuran,and 3-methyl-2,3-dihydrobenzofuran,were identified as products or intermediates and a caducity reaction scheme was suggested.