Comparison Adsorption of Cd (II) Onto Lignin and Polysaccharide-Based Polymers

Overview

Journal Polymers (Basel)

Publisher MDPI

Date 2023 Sep 28

PMID 37765646

Authors

Elena Ungureanu

Maria E Fortuna

Denis C Topa

Carmen O Brezuleanu

Vlad I Ungureanu

Ciprian Chiruta

Razvan Rotaru

Bogdan M Tofanica

Valentin I Popa

Doina C Jitareanu

Affiliations

Soon will be listed here.

Abstract

Given the predominantly negative impact of heavy metals on living organisms, the present study proposed to evaluate the adsorption performances under static conditions of Cd (II) from aqueous solutions on unmodified Sarkanda grass lignin compared to the adsorption performances of polysaccharide polymers chemically functionalized, obtained by synthesis and in their native state, but which, although effective, have a cost price that does not allow for large-scale expansion. To improve the retention of Cd (II) on this aromatic component of the biomass resulting from the processing of lignocellulosic materials, different experimental conditions (pH, concentration, dose and contact time) were followed. The Freundlich and Langmuir isotherms were used to describe the equilibrium conditions. Adsorption kinetics were assessed using the Lagergren I and Ho and McKay II kinetic models, furnishing informative insights into the process mechanism. Lignin adsorption capacity was also analyzed by performing biological tests on tomato seeds (), since heavy metals are known to be a stress factor for seeds by disturbing the osmotic equilibrium. Through the prism of the investigated parameters and under precisely established experimental conditions, unmodified Sarkanda grass lignin-an aromatic biopolymer-can be recommended as a promising adsorbent for the retention of Cd (II) from aqueous solutions, successfully replacing polysaccharide, especially cellulose-based polymers.

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