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In this study, sodium alginate was employed as a starting material for preparing two kinds of biocompatible adsorbents, including calcium alginate hydrogel beads and magnetic hydrogel beads. Fourier transform infrared spectroscopy, X-ray diffraction pattern, and scanning electron microscopy/energy-dispersive X-ray techniques were used to characterize the prepared adsorbents. The performance of the prepared adsorbents for the removal of methyl violet from aqueous solution was studied in detail. Both kinetics and equilibrium aspects of methyl violet adsorption were investigated, and the obtained equilibrium and kinetics data were described with various adsorption models. The effects of initial dye concentration, adsorbent dosage, and temperature on adsorption performance were investigated. Thermodynamic parameters of adsorption were obtained as well.
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http://dx.doi.org/10.1021/acsomega.8b02498 | DOI Listing |
Langmuir
September 2025
Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati, Kamrup, Assam 781039, India.
The efficient and sustainable remediation of contaminated water calls for catalytic systems that must clean broadly, endure widely, and last repeatedly. In this regard, we report the development of sulfonate-functionalized core-shell hydrogel beads embedded with synthesized gold nanoparticles (AuNPs) that exhibit intrinsic oxidase-like activity without requiring external light or chemical oxidants. The sulfonate ligands modulate the surface electronic environment of the AuNPs, facilitating singlet oxygen generation via a nonplasmonic, radiationless mechanism.
View Article and Find Full Text PDFMol Cell Biochem
September 2025
Department of Pharmacy, Faculty of Medical Sciences, University of Kragujevac, 34000, Kragujevac, Serbia.
The aim of this study was to examine the potential antioxidant activity of curcumin in therapeutic and preventive condition and its potential role as adjuvant to conventional drug methotrexate in treatment of rheumatoid arthritis (RA). The study included 104 female Wistar albino rats, 6 weeks old, body weight of 200-250 g, which were divided into 8 groups (n=13 in each group): 1. CTRL: negative control, 2.
View Article and Find Full Text PDFFront Chem
August 2025
AFM-NANO, Instituto Universitario de Bio-Orgánica Antonio González (IUBO-AG), Universidad de La Laguna, San Cristóbal de La Laguna, Spain.
Introduction: We report a reproducible and sustainable catalytic system based on copper ion-crosslinked alginate hydrogels for the synthesis of 1,2,3-triazoles via aqueous 1,3-dipolar cycloaddition at room temperature. The catalyst, derived from a biodegradable matrix, is prepared through a simple, energy-efficient method and operates under mild, eco-friendly conditions.
Methods: Copper(II)-alginate hydrogels were prepared by ionic crosslinking.
Gels
August 2025
Advanced Materials Program, Department of Biological Engineering, Konkuk University, Seoul 05029, Republic of Korea.
A metal-ion-free method was developed to prepare κ-carrageenan/cellulose hydrogel beads for efficient cationic dye removal. The beads were fabricated using a mixture of 1-ethyl-3-methylimidazolium acetate and N,N-dimethylformamide as the solvent system, followed by aqueous ethanol-induced phase separation. This process eliminated the need for metal-ion crosslinkers, which typically neutralize anionic sulfate groups in κ-carrageenan, thereby preserving a high density of accessible binding sites.
View Article and Find Full Text PDFInt J Biol Macromol
August 2025
Advanced Polymer Laboratory, Department of Polymer Science and Technology, Government College of Engineering and Leather Technology (Post-Graduate), Maulana Abul Kalam Azad University of Technology, Salt Lake City, Kolkata 700106, West Bengal, India.
This study was designed to develop a chemically modified chitosan-based sustainable adsorption system for soluble metal pollutants. Here, chitosan hydrogel beads modified with sulphate-sulphuric acid presented a high adsorption capacity toward copper ions and higher reusability due to enhanced low pH tolerance. Though the adsorption process was independent of incubation temperature, it varied with the pH of solution.
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