Solar-Driven Degradation of Anionic Dyes Using Ultrasonically Synthesized Trimetallic Doped ZnO-Graphitic Carbon Nitride Nanocomposite Photocatalyst
- Research Center in Chemistry, MVP Samaj's, KSKW College, CIDCO, Arts, Commerce and Science College Nashik, Maharashtra, India
- Research Centre in Chemistry, MVP Samaj's, KTHM Arts, Commerce and Science College, Nashik, Maharashtra, India
- Research Centre in Chemistry, MVP Samaj's, K.K.Wagh Arts, Science and Commerce College, Pimpalgaon (B), Taluka - Niphad, Dist-Nashik
- Research Center in Chemistry, K.V.N. Naik Arts, Commerce and Science College, Nashik, Maharashtra, India
Received: 2025-02-21
Revised: 2025-05-19
Accepted: 2025-07-10
Published in Issue 2025-12-31
Published Online: 2025-11-05
Copyright (c) 2025 Vaishali Sanjay Raut, Vishal Dnyaneshwar Pardeshi, Yogeshwar Rajaram Baste, Vijay Jotiba Naukudkar, Prashant Bhimrao Koli, Sachin Girdhar Shinde (Author)

This work is licensed under a Creative Commons Attribution 4.0 International License.
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Abstract
We report an ultrasound-assisted green synthesis of 2% Bi2O3, Co3O4, and Fe2O3 co-doped ZnO/g-C₃N₄ nanocomposites. Structural and physicochemical analyses (XRD, FTIR, SEM/EDS, UV–Vis DRS, BET) confirm uniform dopant incorporation, enhanced light harvesting, and increased surface area. Under natural sunlight, the composite achieved 98.1% degradation of Indigo Carmine and 94.8% degradation of Xylidine Ponceau within 90 min, as shown by UV–Vis and TOC measurements. Optimization of pH, catalyst loading, and dye concentration, coupled with radical scavenging assays, identified •OH radicals as the primary reactive species. The catalyst retained over 78% of its initial activity after four successive cycles, demonstrating outstanding stability and reusability. This work introduces a sustainable, low-energy route and a novel trimetallic doping strategy for efficient remediation of organic pollutants.
Keywords
- Ultrasound-assisted synthesis,
- Doped ZnO-g-C3N4 nanocomposite,
- Solar-driven dye degradation,
- Indigo Carmine and Xylidine Ponceau,
- Photocatalysis
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