Multifunctional AgNPs@Chitosan-g-C3N4-OH Nanocomposite: Efficient Catalytic Reduction of Nitro Pollutants, Antibacterial and Antioxidant Applications
- 1Jain (Deemed-to-be University) , , Jain Global Campus, Kanakapura , Ramanagaram, ,
- 2Centre for Nano and Soft Matter Sciences , Survey No. 7, Shivanapura , ,
- 3Florida Gulf Coast University , , , ,
Abstract
A ternary nanocomposite comprising silver nanoparticles anchored on glutaraldehyde-cross-linked chitosan supported on hydroxyl-functionalized graphitic carbon nitride (AgNPs@CS-g-C3N4-OH) was synthesized via in situ reduction of silver in a stepwise method. Structural and physicochemical characterization confirmed successful formation of the material. HR-TEM analysis showed uniformly distributed, quasi-spherical AgNPs with a lattice fringe spacing of ∼0.22 nm, corresponding to the (111) plane of crystalline silver. XPS revealed Ag(0) as the dominant species, while ICP-MS determined the silver loading to be 0.84 wt %. BET analysis indicated a mesoporous structure with surface areas of 10.75 and 7.04 m2 g–1 for CS-g-C3N4-OH and the Ag-loaded composite, respectively. The nanocomposite exhibited excellent catalytic activity in NaBH4-mediated reduction reactions. Conversion efficiencies of 99.79%, 97.91%, and 95.93% were achieved for 4-nitrophenol, metronidazole, and nitrofurantoin within 8, 6, and 2.5 min, respectively. The reactions followed pseudo-first-order kinetics with rate constants of 0.9871, 0.9819, and 0.9774 min–1, and half-lives of ∼0.70 min. Antibacterial studies showed strong activity against Aeromonas hydrophila and Enterococcus faecalis, with inhibition zones up to 16.45 ± 0.35 mm and 17.10 ± 0.70 mm at 500 μg mL–1. The MIC50 values were 28.45 and 13.40 μg mL–1, respectively. The material also exhibited moderate antioxidant activity with an IC50 of 104.6 μg mL–1 and 71.09% scavenging efficiency.
Related
- Eco-friendly synthesis and multifunctional characterization of ZrO₂/Cu₄O₃/MnO₂/CuMnO₂ nanocomposite with enhanced thermal stability and antibacterial activity.
- Multifunctional Ag/MoO3 hybrid nanofiller-enabled PVA/CMC nanocomposite films: complementary enhancement of structural, optical, electrical, dielectric, and antibacterial properties
- Phytosynthesized Ag/MgO nanocomposite from Salvia rosmarinus: a promising multifunctional agent for anticancer, antibacterial, and metabolic enzyme inhibition
- Computational and experimental study of CuO-ZnO nanocomposite using the plant Peganum harmala L. and their antifungal, antibacterial applications.
- Multifunctional Antibacterial Nanocomposites Based on Graphene Oxide, Graphitic Carbon Nitride, and Cobalt Ferrite Functionalized with an Antimicrobial Polymer Blend and Silver Nanoparticles for Biomedical and Environmental Applications
BibTeX
@article{banu2026multifunctional,
title = {{Multifunctional AgNPs@Chitosan-g-C3N4-OH Nanocomposite: Efficient Catalytic Reduction of Nitro Pollutants, Antibacterial and Antioxidant Applications}},
author = {Aakhila Banu A and Abhishek Kumar and Channabasaveshwar V Yelamaggad and Bhari Mallanna Nagaraja and Alejandro Bugarin and Siddappa A. Patil},
journal = {ACS Omega},
year = {2026},
month = oct,
doi = {10.1021/acsomega.6c04143},
url = {https://pubs.acs.org/acsodf/article/11/41/62700/5444586/Multifunctional-AgNPs-Chitosan-g-C3N4-OH},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Multifunctional AgNPs@Chitosan-g-C3N4-OH Nanocomposite: Efficient Catalytic Reduction of Nitro Pollutants, Antibacterial and Antioxidant Applications
AU - Aakhila Banu A
AU - Abhishek Kumar
AU - Channabasaveshwar V Yelamaggad
AU - Bhari Mallanna Nagaraja
AU - Alejandro Bugarin
AU - Siddappa A. Patil
PY - 2026
DA - 2026/10/05
JO - ACS Omega
DO - 10.1021/acsomega.6c04143
UR - https://pubs.acs.org/acsodf/article/11/41/62700/5444586/Multifunctional-AgNPs-Chitosan-g-C3N4-OH
AB - A ternary nanocomposite comprising silver nanoparticles anchored on glutaraldehyde-cross-linked chitosan supported on hydroxyl-functionalized graphitic carbon nitride (AgNPs@CS-g-C3N4-OH) was synthesized via in situ reduction of silver in a stepwise method. Structural and physicochemical characterization confirmed successful formation of the material. HR-TEM analysis showed uniformly distributed, quasi-spherical AgNPs with a lattice fringe spacing of ∼0.22 nm, corresponding to the (111) plane of crystalline silver. XPS revealed Ag(0) as the dominant species, while ICP-MS determined the silver loading to be 0.84 wt %. BET analysis indicated a mesoporous structure with surface areas of 10.75 and 7.04 m2 g–1 for CS-g-C3N4-OH and the Ag-loaded composite, respectively. The nanocomposite exhibited excellent catalytic activity in NaBH4-mediated reduction reactions. Conversion efficiencies of 99.79%, 97.91%, and 95.93% were achieved for 4-nitrophenol, metronidazole, and nitrofurantoin within 8, 6, and 2.5 min, respectively. The reactions followed pseudo-first-order kinetics with rate constants of 0.9871, 0.9819, and 0.9774 min–1, and half-lives of ∼0.70 min. Antibacterial studies showed strong activity against Aeromonas hydrophila and Enterococcus faecalis, with inhibition zones up to 16.45 ± 0.35 mm and 17.10 ± 0.70 mm at 500 μg mL–1. The MIC50 values were 28.45 and 13.40 μg mL–1, respectively. The material also exhibited moderate antioxidant activity with an IC50 of 104.6 μg mL–1 and 71.09% scavenging efficiency.
SN - 2470-1343
ER -