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Harnessing sulfide/oxide interface in NiS-CuO-g-C3N4 nanocomposite for enhanced Electrocatalytic degradation AYR mineralization in wastewater
Journal article   Open access   Peer reviewed

Harnessing sulfide/oxide interface in NiS-CuO-g-C3N4 nanocomposite for enhanced Electrocatalytic degradation AYR mineralization in wastewater

Wishal Zafar, Ali Raza, Muhammad Madni, Asghar Nazir, Malaika Bibi, Abdullah K. Alanazi and A.N. Ahmed
Journal of water process engineering, v 86, 109760
Apr 2026
DOI: https://doi.org/10.1016/j.jwpe.2026.109760
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url
https://doi.org/10.1016/j.jwpe.2026.109760View
Published, Version of Record (VoR) Open CC BY-NC-ND V4.0

Abstract

Electrocatalysis Electrocatalytic water remediation G–C3N4 Metal sulfide-oxide interaction NiS/CuO/g–C3N4
The urgent requirement is to identify an appropriate dye degradation technique and a suitable catalyst material due to the significant water contamination caused by effluent dyes. This study utilized various electrocatalytic materials to confirm efficiency of the electrochemical oxidation technique for eradicating the industrial textile colorant Alizarin Yellow R (AYR) from aqueous solutions: NiS/CuO/g-C3N4 anodes. AYR is regarded as hazardous to aquatic life and potentially harmful to human health due to its potential for mutagenic and carcinogenic effects after extended exposure, underscoring the necessity of its efficient removal from wastewater. X-ray diffraction analysis revealed a lattice assembly with a crystallite extent of 0.2 nm. The adsorption capability was investigated under several experimental conditions, including voltage, catalyst amount, time, and dye intensity. The NiS/CuO/g-C3N4 electrode produced 99.25% AYR degradation in 20 min with ideal voltage, catalyst loading, and AYR concentration, following pseudo-first order kinetic with a rate constant of 0.23 min-1. The surface area was high (129 m2/g) according to the BET analysis, and XRD verified that the composite contained the crystalline structures of NiS, CuO, and g-C3N4. The rapid electron transfer and potent group of hydroxyl radicals are responsible for the effective electrocatalytic activity. The deterioration of AYR occurs according to pseudo-first-order reaction kinetics, and the identification of key intermediate products leads to the proposal of a feasible AYR mineralization pathway. Based on these findings, NiS/CuO/g–C3N4 composite electrode appears to be an auspicious applicant for the electrochemical degradation of AYR wastewater. [Display omitted] •NiS/CuO/g-C3N4 composite anode validate electrochemical oxidation of Alizarin Yellow R removal.•99.25% degradation in 20 min under optimize voltage, catalyst loading, time, and dye concentration.•Performance drive by fast electron transfer and abundant hydroxyl radical (⸱OH); pseudo-first-order kinetics.•XRD confirms crystalline assembly (crystallite 0.2 nm); intermediate identified and a mineralization pathway proposed.

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UN Sustainable Development Goals (SDGs)

This publication has contributed to the advancement of the following goals:

#6 Clean Water and Sanitation

Source: SDGs in the Output

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Collaboration types
Domestic collaboration
International collaboration
Web of Science research areas
Engineering, Chemical
Engineering, Environmental
Water Resources
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