Cationic lignin/silver hybrid nanoparticles with antibacterial activity as robust catalysts for hydrogenation

초록

The development of multifunctional nanocatalysts is critical for effective treatment of wastewater containing both organic and microbial contaminants. In this work, cationic lignin nanoparticles were synthesized via a single-step reaction by introducing quaternary ammonium groups into kraft lignin. These cationic ammonium lignin (CAL) nanoparticles acted simultaneously as stabilizing and reducing agents for the synthesis of silver nanoparticles (AgNPs), forming a CAL@Ag hybrid nanoparticles (CAL@AgNPs) with enhanced colloidal stability and dispersion. Comprehensive characterizations confirmed the successful synthesis and controllable formation of AgNPs on the lignin matrix. The resulting nanocomposite exhibited excellent catalytic activity in the hydrogenation of organic compounds in the presence of NaBH4. Notably, the catalyst retained its activity after 20 successive reuse cycles. Moreover, CAL@AgNPs exhibited excellent antibacterial efficacy against both Grampositive and Gram-negative bacterial strains. These results underscore the considerable potential of CAL@- AgNPs to serve as sustainable and effective nanocatalysts in the fields of environmental remediation and wastewater treatment.

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