Reduced Graphene Oxide-Silver Nanoparticle Composite as Visible Light Photocatalyst for Degradation of Colorless Endocrine Disruptors
Reduced Graphene Oxide-Silver Nanoparticle Composite as Visible Light Photocatalyst for Degradation of Colorless Endocrine Disruptors
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DOI：
10.1021/am505677x
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发表时间：
2014-11-26
影响因子：
9.5
通讯作者：
Jana, Nikhil R.
中科院分区：
文献类型：
--
作者：
Bhunia, Susanta Kumar;Jana, Nikhil R.
日光降解有机污染物是环境污染控制和废水处理的理想途径。尽管各种各样的光催化剂已经朝着这个目标被设计出来，但是通过可见光有效地降解无色有机污染物是一个具有挑战性的问题。在这里，我们证明了还原氧化石墨烯（rGO）基复合材料与银纳米颗粒（rGO- ag）可以作为一种有效的可见光催化剂，用于降解无色有机污染物。我们开发了一种简单、大规模的合成rGO-Ag的方法，并将其用于在紫外和可见光下降解三种众所周知的内分泌干扰物（苯酚、双酚a和阿特拉津）。研究发现，rGO- ag在可见光下的光催化效率明显高于rGO或纳米银。提出银纳米粒子提供可见光诱导的银等离子激元激发，导电氧化石墨烯提供有效的电荷分离，从而诱导有机污染物的氧化降解。这种方法可以扩展到不同有机污染物的阳光诱导降解。
Sunlight-induced degradation of organic pollutants is an ideal approach for environmental pollution control and wastewater treatment. Although a variety of photocatalysts have been designed toward this goal, efficient degradation of colorless organic pollutants by visible light is a challenging issue. Here, we show that a reduced graphene oxide (rGO)-based composite with silver nanoparticle (rGO-Ag) can act as an efficient visible-light photocatalyst for the degradation of colorless organic pollutants. We have developed a simple, large-scale synthesis method for rGO-Ag and used it for the degradation of three well-known endocrine disruptors (phenol, bisphenol A, and atrazine) under UV and visible light. It is found that photocatalytic efficiency by rGO-Ag under visible light is significantly higher compared to that of rGO or silver nanoparticles. It is proposed that Ag nanoparticles offer visible-light-induced excitation of silver plasmons, and conductive rGO offers efficient charge separation and thus induces oxidative degradation of the organic pollutant. This approach can be extended for sunlight-induced degradation of different organic pollutants.