Photoelectrocatalytic degradation of 4-nonylphenol in water with WO₃/TiO₂ nanotube array photoelectrodes

详细信息    查看全文

• 作者：Yanjun Xin ; Mengchun Gao ; Yicheng Wang ; Dong Ma
• 关键词：Photoelectrocatalytic ; 4-Nonylphenol ; TiO2 nanotube array ; WO3 ; Photoelectrodes
• 刊名：Chemical Engineering Journal
• 出版年：15 April, 2014
• 年：2014
• 卷：242
• 期：Complete
• 页码：162-169
• 全文大小：1061 K

文摘

WO₃ decorated TiO₂/Ti Nanotube arrays (WO₃/TNAs) photoelectrodes were fabricated using in situ anodization and electrochemical deposition method. The morphology and structure of WO₃/TNAs photoelectrodes were studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The effects of different parameters, such as initial pH, bias potential and anions in solution, on photoelectrocatalytic (PEC) activity of WO₃/TNAs photoelectrodes were investigated. The degradation mechanism and degradation products of 4-NP were analyzed using liquid-mass spectrometry (LC/MS). The results showed that the degradation percent of 4-nonylphenol (4-NP) on WO₃/TNAs photoelectrodes could reach 90% under neutral conditions after 120 min illumination. After a bias potential of 2.0 V was applied, the degradation percent increased to 98% and the total organic carbon (TOC) removal efficiency was 60%. 4-NP transformed to carboxylic acid substances, CO₂ and H₂O by hydroxylation, dealkylation role, broken bonds and open-loop. Acid and base as well as , Cl^{鈭?/sup>, and ions in solution undermined the removal of 4-NP.}