Antimicrobial activity of metal oxide nanoparticles supported onto natural clinoptilolite.
The antimicrobial activity of Cu(2)O, ZnO and NiO nanoparticles supported onto natural clinoptilolite was investigated in the secondary effluent under dark conditions. After 24h of contact the Cu(2)O and ZnO nanoparticles reduced the numbers of viable bacterial cells of Escherichia coli and Staphylococcus aureus in pure culture for four to six orders of magnitude and showed consistent 100% of antibacterial activity against native E. coli after 1h of contact during 48 exposures. The antibacterial activity of NiO nanoparticles was less efficient. The Cu(2)O and NiO nanoparticles showed 100% of antiprotozoan activity against Paramecium caudatum and Euplotes affinis after 1h of contact, while ZnO nanoparticles were less efficient. The morphology and crystallinity of the nanoparticles were not affected by microorganisms. The metal oxide nanoparticles could find a novel application in the disinfection of secondary effluent and removal of pathogenic microorganisms in the tertiary stage of wastewater treatment.
University of Zagreb, Faculty of Science, Division of Biology, Zagreb, Croatia. jasna.hrenovic@biol.pmf.hr
Jasna
J
Hrenovic
Jelena
J
Milenkovic
Nina
N
Daneu
Renata Matonickin
RM
Kepcija
Nevenka
N
Rajic
D000890:Anti-Infective Agents / Q000737:chemistry / Q000494:pharmacology; D000981:Antiprotozoal Agents / Q000737:chemistry / Q000494:pharmacology; D001688:Biological Products / Q000737:chemistry*; D004355:Drug Stability; D004926:Escherichia coli / Q000187:drug effects; D016812:Euplotes / Q000187:drug effects; D019216:Metals, Heavy / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry* / Q000494:pharmacology*; D048488:Paramecium caudatum / Q000187:drug effects; D013211:Staphylococcus aureus / Q000187:drug effects; D018505:Waste Management; D017641:Zeolites / Q000737:chemistry*
D000890:Anti-Infective Agents; D000981:Antiprotozoal Agents; D001688:Biological Products; D019216:Metals, Heavy; D010087:Oxides; C083175:clinoptilolite; D017641:Zeolites