Modified Spruce Sawdust for Sorption of Hexavalent Chromium in Batch Systems and Fixed-Bed Columns

Overview

Journal Molecules

Publisher MDPI

Specialty Biology

Date 2020 Nov 10

PMID 33167576

Citations 2

Authors

Dororthea Politi

Dimitrios Sidiras

Affiliations

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Abstract

This study investigated the potential use of spruce sawdust that was pretreated with diethylene glycol and sulfuric acid for the removal of hexavalent chromium from wastewater. The sawdust pretreatment process was conducted at different temperatures and times. The adsorbent was characterized by quantitative saccharification, scanning electron microscopy, and Brunauer-Emmet-Teller surface area analysis. Adsorption capacity was studied for both batch and column processes. The experimental adsorption isotherms were simulated using seven isotherm models, including Freundlich and Langmuir models. By using the Langmuir isotherm model, the maximal Cr(VI) adsorption capacity of organosolv-pretreated spruce sawdust () was 318.3 mg g. Furthermore, the kinetic data were fitted to Lagergren, pseudo-second-order, and intraparticle diffusion models, revealing that the adsorption of Cr(VI) onto spruce sawdust pretreated with diethylene glycol and sulfuric acid is best represented by the pseudo-second-order kinetic model. Three kinetic models, namely, the Bohart-Adams model, Thomas model, and modified dose-response (MDR) model, were used to fit the experimental data obtained from the column experiments and to resolve the characteristic parameters. The Thomas adsorption column capacity of the sawdust was increased from 2.44 to 31.1 mg g upon pretreatment, thus, demonstrating that organosolv treatment enhances the adsorption capability of the material.

Citing Articles

Production of Low-Cost Adsorbents within a Circular Economy Approach: Use of Spruce Sawdust Pretreated with Desalination Brine to Adsorb Methylene Blue.

Politi D, Sakellis E, Sidiras D Materials (Basel). 2024; 17(17).

PMID: 39274710 PMC: 11396110. DOI: 10.3390/ma17174317.

Adsorption of Hexavalent Chromium Using Activated Carbon Produced from ssp.: Comparison between Lab Experiments and Molecular Dynamics Simulations.

Alvarez-Galvan Y, Minofar B, Futera Z, Francoeur M, Jean-Marius C, Brehm N Molecules. 2022; 27(18).

PMID: 36144787 PMC: 9503432. DOI: 10.3390/molecules27186040.

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