Abstract
The electro-Fenton system has the ability to degrade wastewater and has received attention from many researchers. Currently, the core development objective is to effectively increase the degraded wastewater decolorization efficiency in the system. In this study, to improve the electro-Fenton system reaction rate and overall electrical properties, we used polyvinylidene difluoride to fix carbon nanotubes (CNTs) and graphene onto the system cathode (carbon felt electrode), which was then used to process Reactive Black 5 wastewater. Furthermore, we (1) used scanning electron microscopy to observe the structural changes in the electrode surface after modification; (2) used the Tafel curve to determine the electrode corrosion voltage and corrosion rate; and (3) analyzed the azo-dye decolorization level. The results showed that the maximum system decolorization rates of the CNT- and graphene-modified carbon felt electrodes were 55.3% and 70.1%, respectively. These rates were, respectively, 1.2 and 1.5 times higher than that of the unmodified carbon felt electrode, implying that we successfully improved the cathode characteristics. The modified electrode exhibited an improved conductivity and corrosion resistance, which, in turn, improved the system decolorization efficiency. This significantly increased the electro-Fenton system overall efficacy, making it valuable for future applications.
Highlights
In recent years, industrial dyeing and finishing processes have produced a large amount of wastewater
Attached objects clearly visible on the fiber surface; theyfelt allow the carbon nanotubes (CNTs) to successfully showstimes
These results indicated that the cathode modified with graphene showed the highest response current (−4.31 mA/cm2 ) at −0.65 V due to the enhancement in the conductivity and specific surface area and that it was superior to the CNT-modified
Summary
Industrial dyeing and finishing processes have produced a large amount of wastewater. Ferric ions will be reduced once more to ferrous ions, which will continue to react with H2 O2 and produce hydroxyl radicals, forming the electro-Fenton system cycle. Advances have been made using carbon materials due to their non-toxicity, high specific surface area, good electrical conductivity, and high chemical stability. Le et al reported that their coatings were made of reduced graphene oxide (rGO) on carbon felt Their results indicated that the charge-transfer resistance for the electrode decreased and the cyclic voltammetry (CV) response increased by ~2.5 times [10]. Carbon felt was used as the substrate and CNTs and graphene were used to modify the electrodes; this was expected to increase the specific surface area and the property for oxidation–reduction reactions of the cathode in the electro-Fenton system. The effects of the modified carbon felt material on the cathode plates were investigated
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
