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负载于金属有机框架上的分级BiOI纳米结构作为水中有机污染物降解的高效光催化剂。

Hierarchical BiOI nanostructures supported on a metal organic framework as efficient photocatalysts for degradation of organic pollutants in water.

作者信息

Jahurul Islam M, Kim Hyun Kook, Amaranatha Reddy D, Kim Yujin, Ma Rory, Baek Heehyun, Kim Joonghan, Kim Tae Kyu

机构信息

Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea.

出版信息

Dalton Trans. 2017 May 9;46(18):6013-6023. doi: 10.1039/c7dt00459a.

Abstract

Semiconductor-based photocatalysis is a green method for the removal of toxic organic pollutants by decomposition into harmless products. However, traditional single-component semiconductors are unable to reach high degradation efficiencies due to excessive photo charge carrier recombination. The use of hybrid nanocomposite photocatalysts is a promising strategy for overcoming this problem by reducing recombination as well as ensuring that large amounts of solar energy are harvested. Herein, a novel visible-light-active hybrid nanocomposite, BiOI/MIL-88B(Fe), was successfully synthesized through a simple precipitation method. In the BiOI/MIL-88B(Fe) composite, both BiOI and MIL-88B(Fe) have improved charge carrier separation and reduced recombination via a simple Z-scheme mechanism. Photocatalytic degradation of the pollutant RhB was carried out during irradiation of the as-synthesized composites with simulated solar light, and the BiOI/MIL-88B(Fe) (2 wt%) composite was found to exhibit the highest photocatalytic activity among the composites. In addition, colorless phenol and ciprofloxacin (CIP) degradation experiments were also performed to confirm the visible light photocatalytic performance of the BiOI/MIL-88B(Fe) hybrid nanocomposite. Scavenger experiments, PL analysis, NBT transformations, and TA-PL experiments all supported the proposed Z-scheme mechanism of the BiOI/MIL-88B(Fe) composite photocatalyst. Moreover, simple separation from solution provides this 3D composite with good reusability and long-term stability.

摘要

基于半导体的光催化是一种通过将有毒有机污染物分解为无害产物来去除它们的绿色方法。然而,传统的单组分半导体由于光生电荷载流子的过度复合而无法达到高降解效率。使用混合纳米复合光催化剂是一种很有前景的策略,通过减少复合以及确保收集大量太阳能来克服这个问题。在此,通过一种简单的沉淀方法成功合成了一种新型的可见光活性混合纳米复合材料BiOI/MIL-88B(Fe)。在BiOI/MIL-88B(Fe)复合材料中,BiOI和MIL-88B(Fe)都通过简单的Z型机制改善了电荷载流子的分离并减少了复合。在用模拟太阳光照射合成的复合材料期间进行了污染物RhB的光催化降解,并且发现BiOI/MIL-88B(Fe)(2 wt%)复合材料在这些复合材料中表现出最高的光催化活性。此外,还进行了无色苯酚和环丙沙星(CIP)降解实验,以确认BiOI/MIL-88B(Fe)混合纳米复合材料的可见光光催化性能。清除剂实验、PL分析、NBT转化和TA-PL实验都支持了所提出的BiOI/MIL-88B(Fe)复合光催化剂的Z型机制。此外,从溶液中简单分离为这种三维复合材料提供了良好的可重复使用性和长期稳定性。

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