Photoelectrocatalytic degradation of 3-nitrophenol at surface of Ti/TiO2 electrode
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The widely utilization of phenol and its derivatives such as 3-nitrophenol (3-NP) has led to the worldwide pollution in the environment. In this study, Ti/TiO2 photoelectrode was prepared with anodic oxidation of Ti foil electrode and then the photoelectrocatalytic (PEC) degradation of 3-NP was performed via this electrode, comparing with photocatalytic (PC), electrooxidation and direct photolysis by ultraviolet light. A significant photoelectrochemical synergetic effect in 3-NP degradation was observed on the Ti/TiO2 electrode and rate constant for the PEC process of Ti/TiO2 electrode was about three times as high as its PC degradation process. 3-NP concentration monitoring was carried out with differential pulse voltammetry. Results showed that PEC degradation has highest effect on concentration decreasing of 3-NP at solution and degraded it about 38 %, while other processes degradation efficiencies were about 4, 7, and 12 % for electrooxidation, direct photolysis and photocatalytic degradation, respectively. Finally, effects of solution pH and applied potential on degradation efficiency were studied and results showed that optimum pH for degradation is equal 4.00 and optimum potential is 1.2 V vs. Ag|AgCl|KCl (3M) reference electrode.
KeywordsPhotocatalysis Photoelectrocatalysis Electrooxidation 3-nitrophenol Ti/TiO2 electrode
- 3.Gratzel M (1983) Energy resources through photochemistry and catalysis. Academic, New YorkGoogle Scholar
- 5.Parmon VN, Zamareav KI (1989) In: Pelizzetti E, Serpone N (eds) Photocatalysis: fundamentals and applications. Wiley, New YorkGoogle Scholar
- 13.Qiao S, Sun DD, Tay JH, Easton C (2003) Water Sci Technol 47:211–217Google Scholar
- 14.Us EPA (1976) Water quality criteria. US EPA, WashingtonGoogle Scholar