A NEW APPROACH FOR WATER PURIFICATION USING GREEN NANOPARTICLES FABRICATED FROM THE LIME PEEL AS SILVER/COPPER NANOPARTICLES FOR THE "BISPHENOL A" REMEDIATION

Abstract

One of the most common endocrine-disrupting compounds (EDCs) in the environment is bisphenol A (BPA), which has been linked to various chronic diseases. In light of these concerns, green synthesis of nanoparticles from plant extracts is a simple yet highly efficient technique to eliminate persistent contaminants such as BPA. This research investigates a new approach for water purification using green nanoparticles fabricated from the lime peel as silver/copper nanoparticles for the “Bisphenol A” remediation from water. The synthesized nanoparticles were characterized using Transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray Photoelectron Spectroscopy (XPS). Additionally, the remediation capacity of the prepared adsorbents for removing BPA was investigated by studying the effect of initial BPA concentrations, pH, and temperatures using ultraviolet–visible spectroscopy (UV-Vis spectroscopy). pH 8 was used in the adsorption isotherm experiments. For CuNPS the adsorption capacity, qmax was 3.7 mg/g at 20℃. Meanwhile, for CuNPP, the qmax was 4.9 mg/g at 35℃. However, CuAgNPP favors higher temperatures with qmax of 7.4 mg/g. The obtained data were best fitted with Langmuir for CuNPS at 20 ℃ and CuNPP at 35 ℃ and 45 ℃. However, CuAgNPP provides good fitting for the four isotherms at an elevated temperature of 45 ℃, whereas it only provides good fitting for Langmuir at 35 ℃. Moreover, the maximum desorption of BPA was achieved by 70% ethanol. The proposed mechanisms for copper/silver adsorption were dominated by physical adsorption. The thermodynamics results demonstrated that the adsorption is exothermic and spontaneous, with the predominant adsorption mechanism being physisorption. Then, the optimized remediation parameters were applied to the remediation of BPA from real water samples. The green synthesized copper nanoparticles aided in removing BPA from water, and loading copper with silver nanoparticles improves the BPA removal.