A Highly Sensitive Chitosan-Based SERS Sensor for the Trace Detection of a Model Cationic Dye DOI Open Access
Bahareh Vafakish, Lee D. Wilson

International Journal of Molecular Sciences, Journal Year: 2024, Volume and Issue: 25(17), P. 9327 - 9327

Published: Aug. 28, 2024

The rapid detection of contaminants in water resources is vital for safeguarding the environment, where use eco-friendly materials monitoring technologies has become increasingly prioritized. In this context, role biocomposites development a SERS sensor reported study. Grafted chitosan was employed as matrix support Ag nanoparticles (NPs) surface-enhanced Raman spectroscopy (SERS). Chitosan (CS) decorated with thiol and carboxylic acid groups by incorporating S-acetyl mercaptosuccinic anhydride (SAMSA) to yield CS-SAMSA. Then, NPs were immobilized onto CS-SAMSA (Ag@CS-SAMSA) characterized spectral methods (IR, Raman, NIR, solid state 13C NMR CP-MAS, XPS, TEM). Ag@CS-SAMSA evaluated substrate SERS, methylene blue (MB) used model dye adsorbate. demonstrated high sensitivity (with an enhancement factor ca. 108) reusability over three cycles, acceptable reproducibility storage stability. imaging revealed large effect, whereas MB varied from 1–100 μM. limits (LOD) quantitation (LOQ) biocomposite characterized, revealing properties that rival current state-of-the-art systems. adsorption profiles studied via fitting isotherm results Hill ΔG°ads process. This research demonstrates sustainable dual-function tailored sensing suitable potential utility advanced treatment technology environmental applications.

Language: Английский

Biopolymers to composite adsorbents for sulfate removal: From conventional to sustainable systems DOI Creative Commons
Bernd G. K. Steiger,

Mostafa Solgi,

Lee D. Wilson

et al.

Advances in Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 340, P. 103440 - 103440

Published: Feb. 13, 2025

Language: Английский

Citations

1
Chitosan Biocomposites with Variable Cross-Linking and Copper-Doping for Enhanced Phosphate Removal DOI Creative Commons
Inimfon A. Udoetok, Abdalla H. Karoyo, Mohamed H. Mohamed

et al.

Molecules, Journal Year: 2024, Volume and Issue: 29(2), P. 445 - 445

Published: Jan. 16, 2024

The fabrication of chitosan (CH) biocomposite beads with variable copper (Cu2+) ion doping was achieved a glutaraldehyde cross-linker (CL) through three distinct methods: (1) formation CH followed by imbibition Cu(II) ions (CH-b-Cu) without CL; (2) cross-linking the beads, (CH-b-CL-Cu); and (3) pristine CH, bead imbibing onto (CH-CL-b-Cu). biocomposites (CH-b-Cu, CH-b-CL-Cu, CH-CL-b-Cu) were characterized via spectroscopy (FTIR, 13C solid NMR, XPS), SEM, TGA, equilibrium solvent swelling methods, phosphate adsorption isotherms. results reveal in accordance step-wise design strategy. CH-CL-b-Cu exhibited greatest pillaring fibrils greater cross-linking, along low loading, reduced swelling, attenuated uptake dianions. Equilibrium kinetic at pH 8.5 295 K that non-CL Cu-imbibed display highest affinity for (Qm = 133 ± 45 mg/g), agreement loading enhanced water swelling. Regeneration studies demonstrated sustainability cost-effectiveness controlled removal, whilst maintaining over 80% regenerability across several adsorption–desorption cycles. This study offers facile synthetic approach Cu2+ chitosan-based enabling tailored oxyanion from aqueous media employing sustainable polysaccharide adsorbent remediation mitigation eutrophication.

Language: Английский

Citations

7
Eggshell incorporated agro-waste adsorbent pellets for sustainable orthophosphate capture from aqueous media DOI Creative Commons
Bernd G. K. Steiger, Nam T. Bui, Bolanle M. Babalola

et al.

RSC Sustainability, Journal Year: 2024, Volume and Issue: 2(5), P. 1498 - 1507

Published: Jan. 1, 2024

In this study, granular adsorbents containing varying ratios of torrefied wheat straw (TWS), eggshells (ES), and chitosan (Chi) were prepared, which are referred to as ternary composites (TWCs).

Language: Английский

Citations

7
Concise review on the development of anionic cellulose materials and their applications in the removal of heavy metals and dyes from water DOI
Ayodele Akinterinwa,

Elizabeth T. Akinterinwa,

Lee D. Wilson

et al.

Deleted Journal, Journal Year: 2025, Volume and Issue: unknown, P. 100065 - 100065

Published: May 1, 2025

Language: Английский

Citations

0
Furfuryl-pyridinium-functionalization of flaxseed gum for effective methylene blue removal from aqueous solution DOI
Deysi J. Venegas-García, Mariam Mir, Bernd G. K. Steiger

et al.

Canadian Journal of Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: May 8, 2024

This study describes the modification of flaxseed gum (FSG) via furfural to obtain a furfuryl-pyridinium modified adsorbent (Flax-Py) with improved adsorption characteristics towards methylene blue (MB) versus results obtained for unmodified FSG. Materials characterization was achieved complementary spectral methods (NMR, X-ray photoelectron spectroscopy, FT-IR, Raman, and XRD) as well thermogravimetric analysis (TGA) ζ-potential measurements. Synthetic FSG yield Flax-Py that led enriched N-content (2.75 atom-% vs. 0.76 FSG), conversion furfuryl pyridinium incomplete (∼50%), where both moieties were identified. The isotherms at pH 7 showed possessed favorably high MB capacity (∼540 mg/g), while notably lower (167 mg/g). facilitated 100% removal low dye concentrations (1–10 mg/L) 50% bioadsorbent. Further, moderate loss (∼12%–16% removal) after five regeneration cycles. revealed settling (time, density, gelation, solubility) facilitate enhanced phase separation fractions by circumventing need centrifugation. mechanism attributed primarily H-bonding effects secondary contributions due electrostatic interactions (negative above 4.2). successfully an attaining nearly quantitative environmentally relevant (<15 mg/L).

Language: Английский

Citations

2
A Highly Sensitive Chitosan-Based SERS Sensor for the Trace Detection of a Model Cationic Dye DOI Open Access
Bahareh Vafakish, Lee D. Wilson

International Journal of Molecular Sciences, Journal Year: 2024, Volume and Issue: 25(17), P. 9327 - 9327

Published: Aug. 28, 2024

The rapid detection of contaminants in water resources is vital for safeguarding the environment, where use eco-friendly materials monitoring technologies has become increasingly prioritized. In this context, role biocomposites development a SERS sensor reported study. Grafted chitosan was employed as matrix support Ag nanoparticles (NPs) surface-enhanced Raman spectroscopy (SERS). Chitosan (CS) decorated with thiol and carboxylic acid groups by incorporating S-acetyl mercaptosuccinic anhydride (SAMSA) to yield CS-SAMSA. Then, NPs were immobilized onto CS-SAMSA (Ag@CS-SAMSA) characterized spectral methods (IR, Raman, NIR, solid state 13C NMR CP-MAS, XPS, TEM). Ag@CS-SAMSA evaluated substrate SERS, methylene blue (MB) used model dye adsorbate. demonstrated high sensitivity (with an enhancement factor ca. 108) reusability over three cycles, acceptable reproducibility storage stability. imaging revealed large effect, whereas MB varied from 1–100 μM. limits (LOD) quantitation (LOQ) biocomposite characterized, revealing properties that rival current state-of-the-art systems. adsorption profiles studied via fitting isotherm results Hill ΔG°ads process. This research demonstrates sustainable dual-function tailored sensing suitable potential utility advanced treatment technology environmental applications.

Language: Английский

Citations

2