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Peer-reviewedCC BY 4.0ACS Omega

Decoupling Network Architecture and Sorption Mechanisms in Cellulose–Alginate and Carboxymethylcellulose–Alginate Hydrogels

  • Paula Paulino Silva1
  • Vinicius Augusto de Melo Gomes1
  • Juliano Brisola1
  • Francisnara Tonholi1
  • Gizilene Maria de Carvalho1
  1. 1State University of Londrina , , Rodovia Celso Garcia Cid, Pr 445 Km 380|Campus Universitário , , ,
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Abstract

Understanding how network architecture governs the properties of polysaccharide-based hydrogels is essential for designing sustainable functional materials. This study investigates structure–property relationships in renewable cellulose/alginate (CEL/AL) and carboxymethylcellulose/alginate (CMC/AL) hydrogels using adsorption experiments as mechanistic probes of network organization, hydration behavior, and adsorbate transport. Structural analyses revealed distinct architectures: CEL/AL retained partial cellulose crystallinity and localized chain ordering despite presenting a heterogeneous porous morphology, whereas CMC/AL exhibited a predominantly amorphous structure associated with greater chain flexibility, higher carboxylate functionality and greater hydration capacity. These structural and chemical differences strongly influenced diffusion pathways and sorption behavior. Adsorption kinetics showed pseudo-second order behavior for methylene blue adsorption in both hydrogels and for Cd2+ adsorption in CMC/AL, while Cd2+ uptake in CEL/AL followed pseudo-first order kinetics. Isotherm analyses indicated Freundlich behavior for methylene blue adsorption onto CEL/AL and Langmuir/Sips behavior for Cd2+, whereas CMC/AL followed the Sips model for both contaminants. Dubinin–Radushkevich analysis indicated differences in the model-derived adsorption energy between CEL/AL and CMC/AL. Both hydrogels achieved removal efficiencies above 50%, highlighting their potential for water treatment. The results indicate that chemical functionality, network organization, and hydration state jointly influence sorption behavior and functional performance.

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Cite

BibTeXRIS
BibTeX
@article{silva2026decoupling,
  title = {{Decoupling Network Architecture and Sorption Mechanisms in Cellulose–Alginate and Carboxymethylcellulose–Alginate Hydrogels}},
  author = {Paula Paulino Silva and Vinicius Augusto de Melo Gomes and Juliano Brisola and Francisnara Tonholi and Gizilene Maria de Carvalho},
  journal = {ACS Omega},
  year = {2026},
  month = oct,
  doi = {10.1021/acsomega.6c07886},
  url = {https://pubs.acs.org/acsodf/article/11/41/63877/5444184/Decoupling-Network-Architecture-and-Sorption},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Decoupling Network Architecture and Sorption Mechanisms in Cellulose–Alginate and Carboxymethylcellulose–Alginate Hydrogels
AU  - Paula Paulino Silva
AU  - Vinicius Augusto de Melo Gomes
AU  - Juliano Brisola
AU  - Francisnara Tonholi
AU  - Gizilene Maria de Carvalho
PY  - 2026
DA  - 2026/10/03
JO  - ACS Omega
DO  - 10.1021/acsomega.6c07886
UR  - https://pubs.acs.org/acsodf/article/11/41/63877/5444184/Decoupling-Network-Architecture-and-Sorption
AB  - Understanding how network architecture governs the properties of polysaccharide-based hydrogels is essential for designing sustainable functional materials. This study investigates structure–property relationships in renewable cellulose/alginate (CEL/AL) and carboxymethylcellulose/alginate (CMC/AL) hydrogels using adsorption experiments as mechanistic probes of network organization, hydration behavior, and adsorbate transport. Structural analyses revealed distinct architectures: CEL/AL retained partial cellulose crystallinity and localized chain ordering despite presenting a heterogeneous porous morphology, whereas CMC/AL exhibited a predominantly amorphous structure associated with greater chain flexibility, higher carboxylate functionality and greater hydration capacity. These structural and chemical differences strongly influenced diffusion pathways and sorption behavior. Adsorption kinetics showed pseudo-second order behavior for methylene blue adsorption in both hydrogels and for Cd2+ adsorption in CMC/AL, while Cd2+ uptake in CEL/AL followed pseudo-first order kinetics. Isotherm analyses indicated Freundlich behavior for methylene blue adsorption onto CEL/AL and Langmuir/Sips behavior for Cd2+, whereas CMC/AL followed the Sips model for both contaminants. Dubinin–Radushkevich analysis indicated differences in the model-derived adsorption energy between CEL/AL and CMC/AL. Both hydrogels achieved removal efficiencies above 50%, highlighting their potential for water treatment. The results indicate that chemical functionality, network organization, and hydration state jointly influence sorption behavior and functional performance.
SN  - 2470-1343
ER  -