We present the in situ synthesis of silver nanoparticles (AgNPs) through ionotropic gelation utilizing the biodegradable saccharides lactose (Lac) and alginate (Alg). The lactose reduced silver ions to form AgNPs. The crystallite structure of the nanocomposite AgNPs@Lac/Alg, with a mean size of 4-6 nm, was confirmed by analytical techniques. The nanocomposite exhibited high catalytic performance in degrading the pollutants methyl orange and rhodamine B. The antibacterial activity of the nanocomposite is pH-dependent, related to the alterations in surface properties of the nanocomposite at different pH values. At pH 6, the nanocomposite demonstrated the highest antibacterial activity. These findings suggest that this nanocomposite has the potential to be tailored for specific applications in environmental and medicinal treatments, making it a highly promising material.

Department of Chemical Technology Ho Chi Minh City University of Food Industry Ho Chi Minh City 700000 Vietnam

Faculty of Applied Technology School of Technology Van Lang University Ho Chi Minh City Vietnam

Faculty of Chemical Engineering Industrial University of Ho Chi Minh City Ho Chi Minh City Vietnam

Faculty of Environment Ho Chi Minh City University of Natural Resources and Environment 236B Le Van Sy Street Tan Binh District Ho Chi Minh City 700000 Vietnam

Graduate University of Science and Technology Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Cau Giay Hanoi 11000 Vietnam

Institute of Biotechnology and Food Technology Industrial University of Ho Chi Minh City Ho Chi Minh City Vietnam

Institute of Chemical Process Fundamentals of the AS CR Prague Czech Republic

Institute of Chemical Technology Vietnam Academy of Science and Technology 1A TL29 Street District 12 Ho Chi Minh City 700000 Vietnam

Institute of Materials Science Vietnam Academy of Science and Technology 18 Hoang Quoc 14 Viet Cau Giay District Hanoi 11000 Vietnam

NTT Hi Tech Institute Nguyen Tat Thanh University Ho Chi Minh City 700000 Vietnam

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