Author(s):
1. Janja Todorović, Prirodno-matematički fakultet Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Mirzeta Saletović, Faculty of Natural Sciences and Mathematics, University of Tuzla , Federation of Bosnia and Herzegovina , Bosnia and Herzegovina

Abstract:
Pyrophyllite clay, modified with PVP coated silver nanoparticles (PYRO-PVP/AgNPs), with recently proved antibacterial activity was prepared. Silver nanoparticles were synthesized by the chemical reduction method of AgNO3 using NaBH4 and poly(vinyl pyrollidone) (PVP) as a stabilizer and excellent dispersant. This research aimed to elucidate the mechanisms and kinetics of AgNPs, along with PVP protective mechanism that are responsible for antibacterial activity towards the microorganisms. Pioneering steps were made toward coagulation studies due to potential of aluminosilicate layered clays to serve as an alternatives to hemostatic agents currently in use. Isoelectric point of pyrophyllite samples with 5, 20, 45 μm diameter particles and PYRO-PVP/AgNPs sample (Ag25mg/L) was evaluated to understand how the anticoagulant or procoagulant properties of the pyrophyllite varied according to the pH of the isoelectric point. Characterization of the PYRO-PVP/AgNPs samples was performed using FTIR spectroscopy, UV/VIS spectroscopy and optical microscope. Release mechanism and kinetics of silver ions were monitored by atomic absorption spectroscopy (AAS). Additionaly, AAS was used for evaluation of heavy metals content in pyrophyllite clay and a simple and cost-effective procedure was proposed for the purification of pyrophyllite. Authors are thankful to the Ministry for Scientific and Technological Development, Higher Education and Information Society of Republic of Srpska for supporting the study through the project No. 19.032/961-78/19.

Key words:
pyrophyllite, nanocomposite, colloidal silver, mechanism of release, kinetics

Date of abstract submission:
10.07.2021.

Conference:
Contemporary Materials 2021 - Savremeni materijali

Applied paper from author