Abstract
Recently, there has been an increasing demand for bioactive compounds from plants that can be employed in the textile industry for the decolorization of reactive dyes from industrial effluents. The use of sustainable approaches, e.g., nanotechnology, for the removal of dyes is gaining more popularity nowadays. Nickel nanoparticles (an eco-friendly adsorbent) using Psidium guajava peels extract were synthesized to degrade reactive Orange E3 dye. Nickel nanoparticles (Ni NPs) were characterized by X-ray diffraction and scanning electron microscopic techniques. The applications of synthesized Ni NPs in the degradation of reactive Orange E3 dye were studied using the effects of dye concentration, a catalyst with and without H2O2, pH, and temperature. The maximum decolorization (82.56%) was acquired at 0.01% color conc., 5 mg/L conc. of Ni-NPs, and pH 5 at 60 degrees C. The decrease in % reduction in COD and TOC was found to be 86.6% and 85.3%, respectively. The currently studied sustainable approach was found to be effective for the maximal removal of target dye. So, it is suggested that other toxic dyes could be easily eliminated using nanoparticles synthesized using a sustainable nano-technological approach.