標題: Electrochemical decolorization of dye wastewater by surface-activated boron-doped nanocrystalline diamond electrode
作者: Chen, Chienhung
Nurhayati, Ervin
Juang, Yaju
Huang, Chihpin
環境工程研究所
Institute of Environmental Engineering
關鍵字: Boron-doped NCD;Surface activation;Electrochemical polarization;Electrooxidation;Azo dye;Acid Yellow (AY-36)
公開日期: 七月-2016
摘要: Complex organics contained in dye wastewater are difficult to degrade and often require electrochemical advanced oxidation processes (EAOPs) to treat it Surface activation of the electrode used in such treatment is an important factor determining the success of the process. The performance of boron-doped nanocrystalline diamond (BD-NCD) film electrode for decolorization of Acid Yellow (AY-36) azo dye with respect to the surface activation by electrochemical polarization was studied. Anodic polarization found to be more suitable as electrode pretreatment compared to cathodic one. After anodic polarization, the originally H-terminated surface of BD-NCD was changed into 0-terminated, making it more hydrophilic. Due to the oxidation of surface functional groups and some portion of sp2 carbon in the BD-NCD film during anodic polarization, the electrode was successfully being activated showing lower background current, wider potential window and considerably less surface activity compared to the non-polailzed one. Consequently, electrooxidation (E0) capability of the anodically-polarized BD-NCD to degrade AY-36 dye was significantly enhanced, capable of nearly total decolorization and chemical oxygen demand (COD) removal even after several times of re-using. The BD-NCD film electrode favored acidic condition for the dye degradation; and the presence of chloride ion in the solution was found to be more advantageous than sulfate active species. (C) 2016 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
URI: http://dx.doi.org/10.1016/j.jes.2016.01.004
http://hdl.handle.net/11536/132571
ISSN: 1001-0742
DOI: 10.1016/j.jes.2016.01.004
期刊: JOURNAL OF ENVIRONMENTAL SCIENCES
Volume: 45
起始頁: 100
結束頁: 107
顯示於類別:期刊論文