Synthesis and characterization of antibacterial silver nanoparticle-impregnated rice husks and rice husk ash

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dc.contributor.authorHe, Den_AU
dc.contributor.authorIkeda-Ohno, Aen_AU
dc.contributor.authorBoland, DDen_AU
dc.contributor.authorWaite, TDen_AU
dc.date.accessioned2015-09-30T01:53:26Zen_AU
dc.date.available2015-09-30T01:53:26Zen_AU
dc.date.issued2013-05-09en_AU
dc.date.statistics2015-09-28en_AU
dc.description.abstractSilver nanoparticle (AgNP)-impregnated rice husks/rice hush ash (RHs/RHA) were successfully synthesized, and their potential application as antibacterial materials in water disinfection was investigated with particular attention given to the use of both white rice husk ash (WRHA) and black rice husk ash (BRHA) produced by the combustion of RHs as AgNP supports. AgNPs, with diameter of ∼20 nm, were anchored tightly onto RHA, with the emplacement of the AgNPs on these supports increasing the antibacterial activity of the AgNPs through diminution in the extent of nanoparticle aggregation. Ag K-edge XANES analysis revealed that AgNP-impregnated RHs/RHA are composed of both Ag(0) and Ag(I) species with the Ag(I)/Ag(0) ratio following the order WRHA (65:35) > RHs (59:41) > BRHA (7:93). Sodium thioglycolate, a strong Ag(I) ligand, significantly affected the bactericidal activities of AgNP-impregnated RHs/RHA, suggesting that Ag(I) released from AgNP-impregnated RHs/RHA plays an important role in disinfection. The rate constants of oxidative and dissociative dissolution of Ag(0) and Ag(I) species associated with BRHA are 5.0 × 10–4 M–1s–1 and 1.0 × 10–5 s–1, respectively, while those associated with WRHA are 7.0 × 10–2 M–1s–1 and 2.0 × 10–4 s–1 respectively, demonstrating that the rate of dissolution of silver associated with BRHA is particularly slow. As such, the bactericidal “lifetime” of this material is long and exhibits a lower health risk as a result of release of Ag(I) to consumers than does AgNP-impregnated WRHA. © 2013, American Chemical Society.en_AU
dc.identifier.citationHe, D., Ikeda-Ohno, A., Boland, D. D., & Waite, T. D. (2013). Synthesis and characterization of antibacterial silver nanoparticle-impregnated rice husks and rice husk ash. Environmental Science & Technology, 47(10), 5276-5284. doi:10.1021/es303890yen_AU
dc.identifier.govdoc6122en_AU
dc.identifier.issn0013-936Xen_AU
dc.identifier.issue10en_AU
dc.identifier.journaltitleEnvironmental Science & Technologyen_AU
dc.identifier.pagination5276-5284en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/es303890yen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6278en_AU
dc.identifier.volume47en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectRiceen_AU
dc.subjectDissolutionen_AU
dc.subjectSilveren_AU
dc.subjectSterilizationen_AU
dc.subjectLigandsen_AU
dc.subjectElectron microscopyen_AU
dc.titleSynthesis and characterization of antibacterial silver nanoparticle-impregnated rice husks and rice husk ashen_AU
dc.typeJournal Articleen_AU
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