Photoelectrocatalytic degradation of 4-nonylphenol in water with WO3/TiO2 nanotube array photoelectrodes
Photoelectrocatalytic degradation of 4-nonylphenol in water with WO3/TiO2 nanotube array photoelectrodes
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WO3/TiO2纳米管阵列光电极光电催化降解水中4-壬基酚
DOI：
10.1016/j.cej.2013.12.068
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发表时间：
2014-04
影响因子：
15.1
通讯作者：
Dong Ma
中科院分区：
文献类型：
--
作者：
Yanjun Xin;Mengchun Gao;Yicheng Wang;Dong Ma
摘要采用原位阳极氧化和电化学沉积相结合的方法制备了WO_3修饰的钛纳米管阵列(WO_3/TNAS)光电极。用扫描电子显微镜(SEM)和X射线衍射仪(X射线衍射仪)研究了WO_3/TNAS复合光电极的形貌和结构。考察了初始pH、偏置电位和溶液中的阴离子等参数对WO_3/TnAS复合光电极光电催化活性的影响。用液质联用(LC/MS)分析了4-NP的降解机理和降解产物。结果表明，在中性条件下，光照120min，4-壬基酚(4-NP)在WO_3/TNAS光电极上的降解率可达90%。在2.0V的偏压下，废水的降解率提高到98%，总有机碳(TOC)的去除效率达到60%。4-NP通过羟化、脱烷基化、断键和开环作用转化为羧酸类物质、CO2和H2O。溶液中的酸碱、SO42-、Cl−、HCO3-、NO3-等离子对4-NP的去除有一定的抑制作用。
Abstract WO 3 decorated TiO 2/Ti Nanotube arrays (WO 3/TNAs) photoelectrodes were fabricated using in situ anodization and electrochemical deposition method. The morphology and structure of WO 3/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 WO 3/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 WO 3/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, CO 2 and H 2 O by hydroxylation, dealkylation role, broken bonds and open-loop. Acid and base as well as SO 4 2-, Cl−, HCO 3-and NO 3-ions in solution undermined the removal of 4-NP.
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DOI：
10.1021/j100333a022
发表时间：
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期刊：
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影响因子：
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作者：
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