Bai Zhiyong, Yang Qi, Wang Jianlong
a School of Water Resources and Environment , China University of Geosciences , Beijing , People's Republic of China.
b Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET , Tsinghua University , Beijing , People's Republic of China.
Environ Technol. 2017 Aug;38(16):2048-2057. doi: 10.1080/09593330.2016.1245360. Epub 2016 Oct 17.
In this paper, FeO/multi-wall carbon nanotubes composites were prepared, characterized and used as a catalyst for enhancing the ozonation of dimethyl phthalate (DMP) in aqueous solution. The experimental results showed that DMP degradation and mineralization increased by 26% and 20%, respectively, in catalytic ozonation compared with single ozonation, and more HO and organic acids were produced during catalytic ozonation process than single ozonation. The effect of pH, ozone concentration and catalyst dosage on DMP degradation was determined. The addition of tert-butanol and phosphates showed a negative effect on DMP degradation, suggesting that the acidic sites on the catalyst is favorable to ozone decomposition to produce hydroxyl radicals. The possible mechanism for catalytic ozonation of DMP was tentatively proposed. The adsorption of ozone and organics onto the surface of catalyst could improve the DMP degradation.
本文制备并表征了FeO/多壁碳纳米管复合材料，并将其用作催化剂以增强水溶液中邻苯二甲酸二甲酯（DMP）的臭氧化反应。实验结果表明，与单独臭氧化相比，催化臭氧化中DMP的降解率和矿化率分别提高了26%和20%，且催化臭氧化过程中产生的羟基自由基和有机酸比单独臭氧化更多。确定了pH、臭氧浓度和催化剂用量对DMP降解的影响。叔丁醇和磷酸盐的添加对DMP降解有负面影响，表明催化剂上的酸性位点有利于臭氧分解产生羟基自由基。初步提出了DMP催化臭氧化的可能机理。臭氧和有机物在催化剂表面的吸附可促进DMP的降解。
