Guo Wan-Qian, Yin Ren-Li, Zhou Xian-Jiao, Du Juan-Shan, Cao Hai-Ou, Yang Shan-Shan, Ren Nan-Qi
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China.
Ultrason Sonochem. 2015 Jan;22:182-7. doi: 10.1016/j.ultsonch.2014.07.008. Epub 2014 Jul 24.
In this research, sulfamethoxazole (SMX) degradation was investigated using ultrasound (US), ozone (O3) and ultrasound/ozone oxidation process (UOOP). It was proved that ultrasound significantly enhanced SMX ozonation by assisting ozone in producing more hydroxyl radicals in UOOP. Ultrasound also made the rate constants improve by kinetics analysis. When ultrasound was added to the ozonation process, the reaction rate increased by 6-26% under different pH conditions. Moreover, main intermediates oxidized by US, O3 and UOOP system were identified. Although the main intermediates in ozonation and UOOP were similar, the introduction of ultrasound in UOOP had well improved the cleavage of S-N bond. In this condition SMX become much easier to be attacked, which led to enhanced SMX removal rate in UOOP compared to the other two examined processes. Finally, the SMX degradation pathways were proposed.
在本研究中，采用超声（US）、臭氧（O3）及超声/臭氧氧化工艺（UOOP）对磺胺甲恶唑（SMX）的降解情况进行了研究。结果表明，在UOOP工艺中，超声通过协助臭氧产生更多的羟基自由基，显著增强了SMX的臭氧化过程。通过动力学分析还发现超声使反应速率常数提高。当在臭氧化过程中加入超声时，在不同pH条件下反应速率提高了6% - 26%。此外，还鉴定了超声、臭氧及UOOP体系氧化产生的主要中间产物。虽然臭氧化和UOOP中的主要中间产物相似，但在UOOP中引入超声很好地促进了S - N键的断裂。在此条件下，SMX更容易受到攻击，这使得与其他两种考察工艺相比，UOOP中SMX的去除率提高。最后，提出了SMX的降解途径。
