Electrochemical oxidation of 4-chlorophenol for wastewater treatment using highly active UV treated TiO2 nanotubes
| Autor: | Sapanbir S. Thind, Aicheng Chen, Min Tian, Xinyong Li, Jesse S. Dondapati |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
Health Toxicology and Mutagenesis 02 engineering and technology 010501 environmental sciences Overpotential Electrocatalyst Electrochemistry 7. Clean energy 01 natural sciences chemistry.chemical_compound Reaction rate constant Environmental Chemistry Phenol 0105 earth and related environmental sciences Chemistry Anodizing Public Health Environmental and Occupational Health Oxygen evolution General Medicine General Chemistry 021001 nanoscience & nanotechnology Pollution 6. Clean water 13. Climate action Electrode 0210 nano-technology Nuclear chemistry |
| Zdroj: | Chemosphere. 209:182-190 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2018.06.042 |
| Popis: | In the present work, we report on a facile UV treatment approach for enhancing the electrocatalytic activity of TiO2 nanotubes. The TiO2 nanotubes were prepared using an anodization oxidation method by applying a voltage of 40 V for 8 h in a DMSO + 2% HF solution, and further treated under UV light irradiation. Compared with Pt and untreated TiO2 nanotubes, the UV treated electrode exhibited a superior electrocatalytic activity toward the oxidation of 4-chlorophenol (4-ClPh). The effects of current density and temperature on the electrochemical oxidation of the 4-ClPh were also systematically investigated. The high electrocatalytic activity of the UV treated TiO2 nanotubes was further confirmed by the electrochemical oxidation of other persistent organic pollutants including phenol, 2-, 3-, 4-nitrophenol, and 4-aminophenol. The total organic carbon (TOC) analysis revealed that over 90% 4-ClPh was removed when the UV treated TiO2 electrode was employed and the rate constant was 16 times faster than that of the untreated TiO2 electrode; whereas only 60% 4-ClPh was eliminated at the Pt electrode under the same conditions. This dramatically improved electrocatalytic activity might be attributed to the enhanced donor density, conductivity, and high overpotential for oxygen evolution. Our results demonstrated that the application of the UV treatment to the TiO2 nanotubes enhanced their electrochemical activity and energy consumption efficiency significantly, which is highly desirable for the abatement of persistent organic pollutants. |
| Databáze: | OpenAIRE |
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