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首页> 外文期刊>Journal of nanoparticle research: An interdisciplinary forum for nanoscale science and technology >Catalytic role of Au@TiO_2 nanocomposite on enhanced degradation of an azo-dye by electrochemically active biofilms: A quantized charging effect
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Catalytic role of Au@TiO_2 nanocomposite on enhanced degradation of an azo-dye by electrochemically active biofilms: A quantized charging effect

机译：Au @ TiO_2纳米复合材料对电化学活性生物膜增强偶氮染料降解的催化作用：定量充电效应

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摘要

A green and sustainable approach to azo dye degradation by an electrochemically active biofilm (EAB) with Au@TiO_2 nanocomposite assistance (average size of Au ~8 nm) has been developed with high efficiency and mineralization of toxic intermediates. The EAB-Au@TiO_2 system degraded the dye more rapidly than the EAB without the nanocomposite, which indicated the catalytic role of the Au@TiO_2 nanocomposite on the dye degradation. Toxicity measurements showed that the dye wastewater treated by the EAB-Au@TiO_2 system was almost non-toxic while the dye wastewater treated by the EAB without the nanocomposite showed a high toxicity compared to the parent dye. Quantized charging and Fermi level equilibration within the Au@TiO_2 nanocomposite may be attributed to the excellent catalytic activity of the nanocomposite on the dye degradation. A mechanism of the catalytic activity is also proposed. Redox behavior and quantized charging of the nanocomposite were confirmed by cyclic voltammetry (CV) and differential pulse voltammetry (DPV), respectively. The proposed protocol can be effectively utilized in wastewater treatment applications.
机译：已经开发出一种绿色且可持续的方法，可通过具有Au @ TiO_2纳米复合助剂（Au〜8 nm的平均粒径）的电化学活性生物膜（EAB）降解高效率和矿化有毒中间体。与没有纳米复合材料的EAB相比，EAB-Au @ TiO_2系统降解染料的速度更快，这表明Au @ TiO_2纳米复合材料对染料降解具有催化作用。毒性测量表明，与母体染料相比，EAB-Au @ TiO_2系统处理的染料废水几乎是无毒的，而没有纳米复合物的EAB处理的染料废水显示出高毒性。 Au @ TiO_2纳米复合材料中的定量电荷和费米能级平衡可能归因于纳米复合材料对染料降解的出色催化活性。还提出了催化活性的机理。分别通过循环伏安法（CV）和微分脉冲伏安法（DPV）确认了纳米复合材料的氧化还原行为和定量电荷。拟议的协议可以有效地用于废水处理应用。

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