Adsorption-depended Fenton-like reaction kinetics in CeO2-H2O2 system for salicylic acid degradation

作者：Zang, Chengjie; Yu, Kaifeng; Hu, Shiyu; Chen, Feng^*

来源：Colloids and Surfaces A: Physicochemical and Engineering Aspects , 2018, 553: 456-463.

DOI：10.1016/j.colsurfa.2018.05.100

• CeO2
• Fenton-like reaction
• Kinetics
• H2O2 decomposition
• Visible light

Degradation of salicylic acid (SA) was employed to investigate the Fenton-like reaction in CeO2-H2O2 system. The adsorption and degradation behaviors of adsorbates (eg. SA, H2O2) on CeO 2 were observed through the kinetics tracks. It is found that SA follows Langmuir isothermal secondary adsorption and its adsorption capacity plays a significant role in promoting Fenton-like process. The enhanced adsorption of SA in acidic environment not only benefits the degradation of SA, but also depresses the H2O2 consumption. When surface CO' sites are over-occupied with highly concentrated H2O2 , the reactivity of interfacial peroxide species would suffer significant decline. Photoabsorption of CeO2 in visible region emerges due to the complexation of surface cerium ions with adsorbed species. Accordingly, a visible light sensitization process initiates electrons transfer from interface species to the ceria; and therefore, the degradation of SA in CeO2-H2O2 system was promoted by visible light (lambda > 420 nm) irradiation. The enhanced Fenton-like reactivity under visible light was also confirmed with DMPO-trapping EPA spectroscopy.

• 出版日期2018-9-20
• 单位华东理工大学