HUNDÁKOVÁ Marianna VSB - Technical University of Ostrava

Antibacterial Cerium-Montmorillonite and Cerium-Vermiculite


The present work is focused on the study of antibacterial activity of cerium-montmorillonite and cerium-vermiculite. Montmorillonite (MT) and vermiculite (VT) and their modified Na-forms, prepared by cation exchange with NaCl solution, were used. Samples with cerium were prepared by mixing of starting materials with aqueous solution of cerium nitrate. The elemental analysis revealed that VT in comparison with MT contained higher amount of cerium. The structural changes of MT and VT after modifications were characterized by X-ray diffraction (XRD) analysis. The XRD patterns of the samples showed cation exchange of cerium in MT and VT. Stability of cerium in MT and VT samples in an aqueous environment was also studied. It was confirmed that cerium was slightly released from samples. Antibacterial activity was tested on Gram-positive (Staphylococcus aureus) and Gram-negative (Pseudomonas aeruginosa) bacterial strains. The inhibitory effect of samples on bacterial growth was confirmed after 24 h of tested time with minimum inhibitory concentration of samples 10 % (w/v). ACKNOWLEDGEMENTS: This work was supported by projects of Ministry of Education, Youth and Sport of Czech Republic no. SP2014/82 and IT4Innovations Centre of Excellence project