Mercury Removal Using Sulfur-Decorated Chitosan Polymer Nanocomposites: Adsorption Performance and Mechanisms
Mvula Confidence Goci, Anny Leudjo Taka, Lynwill Garth Martin, Vernon Sydwill Somerset, Michael John Klink
TL;DR
This paper introduces a new nanocomposite material that efficiently removes mercury from water, offering a promising solution for environmental protection.
Contribution
The novelty lies in the synthesis of sulfur-modified chitosan nanocomposites with enhanced mercury adsorption performance.
Findings
The nanocomposites achieved over 95% mercury removal efficiency under optimized conditions.
Adsorption followed a pseudo-second-order kinetic model and Langmuir isotherm, indicating monolayer adsorption.
Optimal conditions varied slightly between the two nanocomposite types, with pH and contact time being critical factors.
Abstract
In this work, pCh-MWCNTs@Ag-TiO2/S and pCh-MWCNTs@Ag-TiO2 nanocomposites were synthesized through a combined phosphorylation and cross-linked polymerization method. The materials were thoroughly characterized using several analytical techniques, including SEM/EDS, FTIR, TGA, and BET analysis. SEM images revealed that the pCh-MWCNTs@Ag-TiO2/S nanocomposite displayed a smooth, flake-like morphology with spherical, dark greenish particles. EDS analysis confirmed the presence of Si, S, P, and Ag as prominent elements, with Ti, C, and O showing the most intense peaks. The TGA curves indicated significant weight loss between 250–610 °C for pCh-MWCNTs@Ag-TiO2 and 210–630 °C for pCh-MWCNTs@Ag-TiO2/S, corresponding to the decomposition of organic components. FTIR spectra validated the existence of functional groups such as hydroxyl (-OH), carboxyl (-COOH), and carbonyl (-C=O) on the surface of…
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Taxonomy
TopicsAdsorption and biosorption for pollutant removal · Mercury impact and mitigation studies · Advanced Photocatalysis Techniques