An upgraded electro-Fenton treatment of wastewater using nanoclay-embedded graphene composite prepared via exfoliation of pencil rods by submerged liquid plasma

Senthilnathan, Jaganathan and Ambika, S and Younis, Sherif A. and et al, . (2020) An upgraded electro-Fenton treatment of wastewater using nanoclay-embedded graphene composite prepared via exfoliation of pencil rods by submerged liquid plasma. Journal of Hazardous Materials, 397. pp. 1-13. ISSN 0304-3894

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Abstract

In this work, two types of electrochemical electrodes were synthesized using two types (i.e., 4 black (4B) and hard black (HB)) of pencil rods during submerged liquid plasma (SLP) process. At high potential (3 kV) electrons, the SLP process offered an effective exfoliation route for the disorientation of the graphite sp2 domain to produce two nanoclay-graphene composite electrodes with a few graphene layers (thickness = 4–9 layers) and high dispersibility (< 19% settlement: 4 h) in polar/non-polar solution (52–53.1% settlement: 4 h). Their performance was then evaluated towards the electro-Fenton (EF) degradation of lindane using a coated Fe3O4 plate (as Fenton catalyst). Accordingly, both 4B- and HB-ENcGe electrodes showed high specific capacitance values (473 and 363 F g−1) at 0.05 A g−1 and excellent triangular charge-discharge patterns (< 9% and 35% reduction of capacitance, respectively after 1000 cycles (charging rate: 0.2 A g-1)). At pH 3 and current density of 6.5 mA cm-2, 4B-ENcGe exhibited superior EF degradation performance (99.4% after 60 min) against 2.5 mg L-1 lindane (H2O2 generation capacity: 2.53 mmol. h−1, current efficiency: 89.4%, and stability: up to 5th cycles). The complete EF-based mineralization of lindane suggests that these electrodes should offer one-step cost-effective treatment for wastewater contaminants. © 2020 Elsevier B.V.

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IITH Creators:

IITH Creators	ORCiD
Ambika, S	UNSPECIFIED

Item Type:

Article

Additional Information:

Our sincere thanks to the facilities provided for material characterization and applications by the PCGMR, Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan. We gratefully acknowledge the facilities and support provided by the Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, India. KHK also acknowledges the support from the R&D Center for Green Patrol Technologies through the R&D for Global Top Environmental Technologies funded by the Ministry of Environment (Grant No: 2,018,001,850,001) as well as a grant from the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (Grant No:2016R1E1A1A01940995).

Uncontrolled Keywords:

Electro-Fenton oxidation; Electrochemical electrodes; Nanoclay-graphene composite; Pencil rods; Submerged liquid plasma; Wastewater treatment

Subjects:

Civil Engineering

Divisions:

Department of Civil Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

26 Oct 2022 09:08

Last Modified:

26 Oct 2022 09:08