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. 2022 Jul 16;13(7):1125.
doi: 10.3390/mi13071125.

A Comparative Study on Optofluidic Fenton Microreactors Integrated with Fe-Based Materials for Water Treatment

Lijun Liu  1 , Ning Wang  1 , Liang Wan  1 , Chao Zhao  1 , Kunpeng Niu  1 , Dajuan Lyu  2 , Zhaolong Liao  2 , Biao Shui  2
Affiliations

A Comparative Study on Optofluidic Fenton Microreactors Integrated with Fe-Based Materials for Water Treatment

Lijun Liu et al. Micromachines (Basel). .

Abstract

The catalysts employed in catalytic reactors greatly affect the reaction efficiency of the reaction system and the reactor’s performance. This work presents a rapid comparative study on three kinds of Fe-based materials integrated into an optofluidic Fenton reactor for water treatment. The Fe-based sheets (FeSiB, FeNbCuSiB, and FeNi) were respectively implanted into the reaction chamber to degrade the organic dyes with the assistance of H2O2. In the experiment, by adjusting the hydrogen peroxide concentration, flow rate, and light irradiation, the applicable conditions of the Fe-based materials for the dye degradation could be evaluated quickly to explore the optimal design of the Fenton reaction system. The results indicated that FeNi (1j85) exhibits excellent degradability in the microreactor, the reaction rate can reach 23.4%/s at the flow rate of 330 μL/min, but its weak corrosion resistance was definitely demonstrated. Although the initial degradability of the microreactor by using FeNbCuSiB (1k107) was not as good as that of 1j85, it increased after being reused several times instead, and the degradation efficiency reached >98% after being reused five times. However, the FeSiB (1k101) material shows the worst degradability and recycling. Therefore, in contrast, 1k107 has the greatest potential to be used in Fenton reactors for practical water treatment.

Keywords: Fe-based sheet; Fenton reaction; MB degradation; microreactor; reusability.

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Conflict of interest statement

The authors declared no potential conflict of interest with respect to the research, authorship, and/or publication of this article.

Figures

Figure 1
Figure 1
The diagrammatic sketch of the optofluidic Fenton microreactor; (a) the 3D structural diagram; (b) the cross-section and the reaction pathway.
Figure 2
Figure 2
The XRD patterns of the Fe-based sheets.
Figure 3
Figure 3
The MB degradation by using the microreactors with the different Fe-based sheets at different flow rates; (a) the degradation efficiency; (b) the reaction rate as the function of the reaction time.
Figure 4
Figure 4
The MB degradation under different concentrations of H2O2 by using the microreactors with different Fe-based sheets; (a) the degradation efficiency; (b) The degraded MB solution samples.
Figure 5
Figure 5
Reusability of the microreactors implanted with the 3 kinds of Fe-based sheets; (a) the degradation efficiency of the microreactors reused for 5 times; (b) the content of Fe in the reacted solution at different reused times.
Figure 6
Figure 6
The surface features of the 3 kinds of Fe-based sheets before reaction and after being reused 5 times; (a) the AFM photos; (b) the images of the contact angles.
Figure 7
Figure 7
The degradation efficiency of MB by using the microreactors with and without Fe-based sheets under different light irradiation.
See this image and copyright information in PMC

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