Kinetic Analysis of the Adsorption of Chromium onto Calcium Alginate Nanoparticles

Bilal Ibrahim Dan-Iya,Ibrahim Alhaji Sabo,Salihu Yahuza

doi:10.54987/bessm.v5i2.648

Abstract

The widespread use of chromium in industrial applications such as leather tanning, metallurgy, electroplating, and refractory materials has resulted in it being one of the most harmful trace elements to be introduced into surface and ground waters. The sorption isotherm of chromium sorption onto calcium alginate nanoparticles were analyzed using three models—pseudo-1st, pseudo-2nd and Elovich, and fitted using non-linear regression. The Elovich model was the poorest in fitting the curve based on visual observation followed by the pseudo-1st order. Statistical analysis based on root-mean-square error (RMSE), adjusted coefficient of determination (adjR2), bias factor (BF), accuracy factor (AF), corrected AICc (Akaike Information Criterion), Bayesian Information Criterion (BIC) and Hannan–Quinn information criterion (HQC) that showed that the pseudo-1ST order model is the best model. Kinetic analysis using the pseudo-1st order model at 400 mg/L 4-BDE gave a value of equilibrium sorption capacity qe of 31.89 mg g-1 (95% confidence interval from 30.37 to 33.42) and a value of the pseudo-1st-order rate constant, k1 of 0.22 (95% confidence interval from 0.019 to 0.025). Further analysis is needed to provide proof for the chemisorption mechanism usually tied to this kinetic.

Highlights

Because of its extensive usage in industrial applications like as leather tanning, metallurgy, electroplating, and refractory chromium is one of the most harmful trace elements introduced into surface waters and ground waters
Further analysis is needed to provide proof for the mechanism usually tied to this kinetic
Statistical analysis based on root-mean-square error (RMSE), adjusted coefficient of determination, bias factor (BF), accuracy factor (AF), corrected AICc (Akaike Information Criterion), Bayesian Information Criterion (BIC) and Hannan–Quinn information criterion (HQC) showed that the pseudo-1st order model is the best model giving valuable parameters such as the equilibrium sorption capacity qe and the pseudo-second-order rate constant, k2, which can be further utilized in isothermal modelling analysis

Summary

Introduction

Because of its extensive usage in industrial applications like as leather tanning, metallurgy, electroplating, and refractory chromium is one of the most harmful trace elements introduced into surface waters and ground waters. The rising number of studies published regarding chromium toxicity over the past ten years demonstrates the increasing number of attempts to show and remediate chromium-bearing pollution in the environment. Using standard procedures, such as chemical precipitation, ion exchange, membrane filtration, coagulation/flocculation, and electrochemical treatment, trace elements may be removed from wastewaters [1,2,3,4,5]. Sorption is the process by which sorbate is transferred from its liquid phase to the surface of a sorbent. Whereas in the physiosorption process, the sorbate attaches to the sorbent surface by weak forces such as van der Waals forces [6,7,8,9,10]

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