Significant enhancement of micropollutant photocatalytic degradation using a TiO2 nanotube array photoanode based photocatalytic fuel cell
Significant enhancement of micropollutant photocatalytic degradation using a TiO2 nanotube array photoanode based photocatalytic fuel cell
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DOI：
10.1016/j.cej.2018.08.064
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发表时间：
2018-12
影响因子：
15.1
通讯作者：
Y. Ye;H. Bruning;Xiaolu Li;D. Yntema;H. Rijnaarts
中科院分区：
文献类型：
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作者：
Y. Ye;H. Bruning;Xiaolu Li;D. Yntema;H. Rijnaarts
研究了由TiO 2纳米管阵列光阳极和Cu阴极组成的无膜光催化燃料电池（TNA-Cu PFC系统）在去除水中微量污染物方面的应用。显着增强去除常见的水溶液中的微污染物4-氯-2-甲基苯氧基乙酸（MCPA），得到在这个TNA-Cu PFC系统：TNA-Cu PFC系统实现了更好的MCPA降解相比，使用相同的催化剂的传统光催化方法。在TNA-Cu PFC系统中，在酸性条件下，MCPA的降解大大促进，表明这是一个重要的操作条件。TNA-Cu PFC体系中MCPA降解的增强与更好的e-/h+分离和其他氧化剂的产生有关：在常规光催化过程中，液相中的羟基自由基对MCPA降解的贡献率为93.7%，而其他氧化剂如dotO 2-、H2 O2、dotHO 2等仅占2.4%;对于TNA-Cu PFC体系中的MCPA降解，液相中羟基自由基的贡献降低到83.6%，而其他氧化剂如dotO 2-、H2 O2、dotHO 2自由基的贡献增加到15.3%。通过LC-MS/MS降解中间体分析证实了MCPA降解机制的这种变化。电解质浓度影响的研究表明，在酸性条件下操作时，不需要添加电解质。TNA-Cu PFC系统被证明在高达15 mg/L的天然有机物（来自两条大河），大量的常见无机离子的存在下，甚至在污水处理厂的污水中也能很好地工作。TNA-Cu PFC系统在多次重复使用后也表现出相对较好的稳定性。所获得的结果表明，这是一个适当的系统，从水中的微污染物去除在水循环中的各个地方，i.e.as抛光的污水处理厂废水排放前或清洁取水前生产饮用水。
This study evaluated the application of a membrane-free photocatalytic fuel cell composed of a TiO2nanotube array photoanode and a Cu cathode,i.e.TNA-Cu PFC system, for micropollutant removal from water. Significantly enhanced removal of a commonly present aqueous micropollutant 4-chloro-2-methylphenoxyacetic acid (MCPA) was obtained in this TNA-Cu PFC system: the TNA-Cu PFC system achieved better MCPA degradation compared to the conventional photocatalytic method using the same catalyst. In the TNA-Cu PFC system, the MCPA degradation was largely promoted under acidic conditions, indicating this as an important operational condition. The enhancement of MCPA degradation in the TNA-Cu PFC system involved better e−/h+separation and generation of other oxidants: in conventional photocatalytic process, hydroxyl radicals in liquid phase contributed to 93.7% MCPA degradation while only 2.4% MCPA degradation was mediated by other oxidants likeradical dotO2−, H2O2,radical dotHO2; for MCPA degradation in the TNA-Cu PFC system, the contribution of hydroxyl radicals in the liquid phase decreased to 83.6%, while contribution of other oxidants likeradical dotO2−, H2O2,radical dotHO2increased to 15.3%. This change in MCPA degradation mechanisms was confirmed via degradation intermediates analysis by LC-MS/MS. The study on the effect of electrolyte concentration suggests that when operated under acidic conditions, addition of electrolyte is not required. The TNA-Cu PFC system was shown to work well in the presence of up to 15 mg/L natural organic matter (originating from two large rivers), high amounts of common inorganic ions, and even in WWTP effluent. The TNA-Cu PFC system also exhibited relatively good stability after several cycles of repeated use. The obtained results demonstrated that this is an adequate system for micropollutant removal from water at various places in the water cycle,i.e.as polisher of WWTP effluents before discharge or for cleaning intake water before producing drinking water.