Highly efficient photocatalytic removal of sodium pentachlorophenate with Bi3O4Br under visible light
Highly efficient photocatalytic removal of sodium pentachlorophenate with Bi3O4Br under visible light
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Bi3O4Br 可见光下高效光催化去除五氯酚钠
DOI：
10.1016/j.apcatb.2013.02.009
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发表时间：
2013-06
期刊：
影响因子：
--
通讯作者：
Zhang, Lizhi
中科院分区：
文献类型：
--
作者：
Wang, Jiling;Yu, Ying;Zhang, Lizhi
在这项研究中，我们证明 Bi3O4Br 是一种优异的可见光驱动光催化剂，用于典型氯化苯酚衍生物五氯酚钠的分解和矿化。在500W氙灯、420nm截止滤光片可见光照射下，15min可去除浓度为40mg/L的五氯酚钠92%以上，并伴有80%的矿化率。密度泛函理论（DFT）计算和系统表征表明，可见光驱动的Bi3O4Br高效去除五氯酚钠可归因于Bi3O4Br中光生载流子的有效分离和转移，其带隙更窄，导带位置更负，有利于光生电子被分子氧俘获产生O2−。 O2−自由基不仅可以抑制光生载流子的复合，而且有利于氯化苯酚衍生物的脱氯。采用高效气相色谱-质谱法仔细研究了可见光诱导的五氯酚钠降解途径。这项研究为利用太阳光去除氯化苯酚衍生物提供了一种新的光催化剂。
In this study we demonstrate that Bi3O4Br is a superior visible light driven photocatalyst for the decomposition and mineralization of a typical chlorinated phenol derivative sodium pentachlorophenate. It could remove more than 92% of sodium pentachlorophenate with concentration of 40mg/L under visible light irradiation from 500W Xe-lamp with a 420nm cut off filter in 15min, accompanying with 80% of mineralization. Density functional theory (DFT) calculation and systematical characterization reveal that high efficient visible light driven sodium pentachlorophenate removal with Bi3O4Br could be attributed to effective separation and transfer of photoinduced charge carriers in Bi3O4Br with narrower band gap and more negative conduction band position, which favors the photogenerated electrons trapping with molecular oxygen to produce O2−. The O2−radicals could not only inhibit the recombination of photoinduced charge carriers, but also benefit the dechlorination of chlorinated phenol derivative. The visible light induced degradation pathway of sodium pentachlorophenate was carefully investigated with high performance gas chromatography–mass spectrometry. This study provides a new photocatalyst for chlorinated phenol derivative removal with solar light.
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