孙胜鹏副教授在 Chemical Engineering Journal 上发表研究论文

Hydroxyl and sulfate radicals formation in UVA/FeIII-NTA/S2O8 2− system: Mechanism and effectiveness in carbamazepine degradation at initial neutral pH

Yaoyao Jina , Xiaoning Wanga , Sheng-Peng Suna, *(孙胜鹏) , Wenbo Dongb , Zhangxiong Wua , Guoqing Biana , Winston Duo Wua , Xiao Dong Chena

  

a School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, China

 b Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China

  

Chemical Engineering Journal 368 (2019) 541--552

  

Ferrous ion (FeII)-induced activation of persulfate (S2O8 2−), reference to the generation of sulfate radical (SO4 %−), has attracted considerable attention in water treatment for refractory organic contaminants removal. However, two major challenges, i.e., the required acidic pH condition and the extremely slow FeIII/FeII redox cycle, limit the application of FeII/S2O8 2− process. Herein, the present work addresses S2O8 2− activation in aqueous solutions at neutral pH by a ferric-nitrilotriacetic (FeIII-NTA) complex under low pressure UVA irradiation. The results showed that UVA irradiation-induced FeIII-NTA reduction could effectively enhance FeIII/FeII redox cycle for the S2O8 2− activation under neutral pH condition. Electron spin resonance spectroscopy (ESR) and radicals quenching tests indicated that the major reactive species included SO4 %− and hydroxy radicals (HO% ) in UVA/FeIII-NTA/S2O8 2− process, which contributed more than 80% degradation of a model compound carbamazepine (CBZ). In addition, comprehensive investigations were conducted on the important parameters including NTA:FeIII molar ratio, initial pH, FeIII-NTA and S2O8 2− dosages and their impacts on CBZ degradation kinetics. The critical NTA:FeIII molar ratio was determined at 1:1, above this ratio the excess NTA would act as a scavenger of SO4 %−/HO% thereby inhibiting the degradation of CBZ. The secondary reaction rate constant of NTA with SO4 %− was determined at 5.89 × 107 M−1 s −1. Moreover, the degradation of CBZ by UVA/FeIII-NTA/ S2O8 2− process in real water matrix (lake water, groundwater and tap water) with environmentally relevant concentration were conducted, and the efficacies were compared with UVA/FeIII-NTA/H2O2 (i.e., photo-Fenton

  

 

  

链接:https://www.sciencedirect.com/science/article/pii/S1385894719304310?via%3Dihub