Novel Cu2O quantum dots coupled flower-like BiOBr for enhanced photocatalytic degradation of organic contaminant
Novel Cu2O quantum dots coupled flower-like BiOBr for enhanced photocatalytic degradation of organic contaminant
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DOI：
10.1016/j.jhazmat.2014.08.032
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发表时间：
2014-09-15
影响因子：
13.6
通讯作者：
Liang, Yinghua
中科院分区：
文献类型：
--
作者：
Cui, Wenquan;An, Weijia;Liang, Yinghua
在这里，我们报告了一种高效的新型光催化剂组成的Cu 2 O量子点（QDs）纳入三维（3D）花状分层BiOBr（以下简称QDs-Cu 2 O/BiOBr），这是通过一个简单的还原溶液化学路线合成，并应用于净化含苯酚和有机染料的有害废水。通过结构和组成表征证实了Cu 2 O量子点在BiOBr表面上的沉积。QDs-Cu_2 O/BiOBr复合材料在可见光下对有机污染物具有上级降解活性，其中质量分数为3%的QDs-Cu_2 O/BiOBr复合材料对苯酚和亚甲基蓝的降解率最高，分别是纯BiOBr的11.8倍和1.4倍，表明QDs-Cu_2 O/BiOBr复合材料在净化有害有机污染物方面具有巨大的应用潜力。PL、光电流和EIS测试结果证实，Cu 2 O量子点的引入提高了光催化剂的可见光吸收效率，并有效分离了来自紧密接触界面的光生载流子和有序的能带结构.根据实验和理论分析结果，提出了可能的光催化机理. (C)2014爱思唯尔有限公司版权所有。
Here we report a highly efficient novel photocatalyst consisting of Cu2O quantum dots (QDs) incorporated into three-dimensional (3D) flower-like hierarchical BiOBr (hereafter designated QDs-Cu2O/BiOBr), which were synthesized via a simple reductive solution chemistry route and applied to decontaminate the hazardous wastewater containing phenol and organic dyes. The deposition of Cu2O QDs onto the surface of the BiOBr was confirmed by structure and composition characterizations. The QDs-Cu2O/BiOBr composites exhibited superior activity for organic contaminant degradation under visible light and 3 wt% QDs-Cu2O/BiOBr composite showed the highest degrade rate for phenol and methylene blue (MB), which was 11.8 times and 1.4 times than that of pure BiOBr, indicated the QDs-Cu2O/BiOBr composite has the great potential application in purifying hazardous organic contaminant. The incorporated Cu2O QDs played an important role in improving the photocatalytic performance, due to the enhancement of visible light absorption efficiency as well as the efficient separation of the photogenerated charge carriers originating from the intimately contacted interface and the well-aligned band-structures, which was confirmed by the results of PL, photocurrent and EIS measurements. The possible photocatalytic mechanism was proposed based on the experiments and theoretical results. (C) 2014 Elsevier B.V. All rights reserved.