Abstract
Abstract
Because of it high solubility in water, m-cresol is an important class of water contaminants. Due to toxicity effects and endocrine disrupting properties of this phenolic compound, removal of it from water and wastewater has gained much attention. In the present work, m-cresol degradation has been studied in aqueous medium using silver nanoparticles (Ag NPs) synthesized using leaf extract of Nyctanthes arbor-tristis. N. arbor-tristis leaf extract was used as the reducing agent in fabrication of Ag NPs in different solvents (water, ethylene glycol, and ethyl acetate) using ultrasonic-assisted method. Ag NP prepared in different solvent shows different shape and size. Ag NPs prepared in water medium show different shape–triangular and spherical. Ag NPs tailored in ethylene glycol and ethyl acetate medium show spherical and elongated shape with different sizes. Particles as such prepared have diverse pioneer catalytic activities toward degradation of m-cresol. Ag NP prepared in water medium completely degrades m-cresol in 93 min, while Ag prepared in ethylene glycol and ethyl acetate medium took a longer time. Degradation process followed first order kinetics with rate constant value in the following order—kAg water > kAg ethylene glycol > kAg ethyl acetate. Superior catalytic efficacy of Ag fabricated in water is attributed to the synergetic effect of facet shape, exposing a highly active face and the size dependent surface activity of particles.
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