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ABSTRACT
This research study explores the innovative use of waste materials (snail shells) for the treatment of industrial paint effluent. Paint effluent, known for its complex composition of heavy metals, organic solvents, and suspended solids, poses significant environmental challenges. Nanomaterials due to their unique properties, high reactivity and high surface area to volume ratio, offers promising solutions for efficient wastewater treatment. The synthesis, optimization, and application of calcium oxide (CaO) nanoparticles derived from waste snail shells was investigated. The nanoparticles were synthesized via the sol-gel method and characterized using Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), X-ray diffraction (XRD), and scanning electron microscopy (SEM). Response surface methodology (RSM) with central composite design (CCD), was used to optimize the treatment conditions (pH, contact time, and adsorbent dosage), with the optimum values determined as pH 7, contact time of 52.5 minutes, and CaO-NPs dosage of 5.5 g/L. This optimized condition achieved a remarkable 98.1091% contaminants removal efficiency. This study not only demonstrates the efficacy of CaO nanoparticles for paint wastewater treatment but also underscores the sustainable approach of utilizing waste materials to treat waste. The cost efficiency of this method further highlights its potential for practical application in environmental remediation efforts.
