Abstract

Pranali I.Choudhari^1*, Sarang S. Dhote¹ and Mamata R. Lanjewar²

DOI : http://dx.doi.org/10.13005/ojc/400107

The impact of toxic heavy metals on the environment is a significant global issue. This study's main goal is to remove Cr(VI) from water by using biodegradable materials like chitosan and mature Plumeria alba leaves as a composite biosorbent. The newly prepared biosorbent is characterized by BET, FTIR, SEM, EDX, and TGA & DTA analysis. The porous morphology, surface characteristics, crystalline nature, and thermal stability were evaluated. To determine the actual mechanism underlying the first stages of the sorption process, several variables, including contact time, solution pH, adsorbent dose, and beginning metal ion concentration, are used to test the biosorbent's adsorption capacity. It was discovered that pH 4, adsorbent dose 0.5g, adsorption time 120 min, and Cr(VI) concentration 25 mg L-1 were the ideal operating conditions. There was a 92% maximum elimination of Cr(VI). The Langmuir model was utilized to obtain a qmax value of 366.3 mg/g. The biosorbent offered a superior match to pseudo-second-order kinetic models and the Langmuir isotherm model. and ΔH0 negative values fell and were shown to be exothermic and spontaneous during the entire process of adsorption. The experimental investigation suggested that the bio-sorbent may have developed into a promising, environmentally friendly adsorbent.

Adsorption; Adsorption isotherm; Cr(VI); Chitosan; Mature Plumeria alba leaves; ZnCl2

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