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Ion-concentration-polarization-assisted photocatalytic reactor for highly efficient water purification
Lab on a Chip ( IF 6.1 ) Pub Date : 2022-06-27 , DOI: 10.1039/d2lc00140c
Cong Wang 1 , Joa Jeon 2 , Eunseok Seo 2 , Jungyul Park 2
Affiliation  

Photocatalysis, which utilizes solar energy to electrochemically decompose water pollutants into harmless products, has attracted considerable attention to address serious environmental issues. The photocatalytic effect can be enhanced using an external electric field owing to the inhibition of the recombination of photoexcited electrons and holes. However, the typical linear potential bias that induces a small potential drop across a thin photocatalyst film exhibits a limited photocatalytic reaction. Herein, we propose an ion-concentration-polarization-assisted photocatalytic reactor that generates a nonlinear electric field across the microchannel of this system, which enables an 85.5% increase in the reaction rate compared to that achieved using a linear potential, and a high reaction rate constant up to 12.7 min−1 is achieved. The nonlinear electric field induced by concentration polarization, the nanofluidic electrokinetic phenomenon, results in a considerably increased potential drop across the photocatalyst layer such that the recombination of photoexcited electrons and holes may be efficiently prevented. The facilitated photocatalytic reaction is verified with the plastic film degradation. This proposed enhancing mechanism shows a novel application of nanofluidics for improving the photocatalytic effect, and the potential to be a new class of platform for a photocatalytic reactor owing to its simple configuration and fabrication procedures.

中文翻译:

离子浓度极化辅助光催化反应器用于高效水净化

光催化利用太阳能将水污染物电化学分解成无害产物,在解决严重的环境问题方面引起了相当大的关注。由于抑制了光激发电子和空穴的复合,可以使用外部电场增强光催化效果。然而,典型的线性电位偏差会在光催化剂薄膜上引起小的电位降,但光催化反应有限。在此,我们提出了一种离子浓度极化辅助光催化反应器,该反应器在该系统的微通道上产生非线性电场,与使用线性电位实现的反应速率相比,反应速率提高了 85.5%,并且反应速度快。速率常数高达 12.7 min -1已完成。由浓差极化引起的非线性电场,即纳米流体电动现象,导致整个光催化剂层的电位降显着增加,从而可以有效地防止光激发电子和空穴的复合。通过塑料薄膜降解验证了促进的光催化反应。这种提出的增强机制显示了纳米流体在提高光催化效果方面的新应用,并且由于其简单的配置和制造程序,有可能成为新型光催化反应器平台。
更新日期:2022-07-01
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