臭氧氧化水中壬基酚的反应机理研究

采用臭氧氧化浓度为20 mg/L的壬基酚溶液,研究了臭氧氧化去除壬基酚的效果及氧化过程中中间产物的变化情况,探讨了臭氧氧化壬基酚的反应机理.结果表明,臭氧氧化涉及2种氧化方式,臭氧分子的单独反应和臭氧/羟基自由基的联合氧化.2种氧化方式在18 min内均能完全去除壬基酚,联合氧化方式在4 min内即能达到96％的去除率,而单独臭氧分子氧化需要12 min.氧化过程中检测到甲醛的产生,单独臭氧氧化下甲醛产生量在8 min左右达到稳定,而混合氧化方式下甲醛量逐步增加.

Mechanism and Pathway of the Ozonation of Nonylphenol in Aqueous Solution

20 mg/L nonylphenol solution was ozonized. The removal efficiency and the intermediate products were studied during the ozonation of nonylphenol, the possible reaction mechanism of the ozonation of nonylphenol was proposed. The experimental results indicate that there are two kinds of ozonation patterns, the oxidation by molecule O₃ alone and by O₃/·OH. Both ozonation patterns can remove nonylphenol completely within 18 minutes. However, the combined oxidation can remove 96 % of the initial nonylphenol within 4 minutes, and it took 12 minutes in the single O₃ molecule oxidation system. The formaldehyde was detected during the ozonation of nonylphenol. The concentration reached stability after 8 minutes during the oxidation by single O₃ and gradually increased during the combined oxidation process.