| 英文摘要 |
In this study, we evaluated the potentiality of air pollution control using biologically transformed nano-sized gold particles, which mediated by microorganism isolated from abandoned mining area, chemically synthesized and commercial nano-sized gold particles. For air pollutant control, the results showed that the reference material could remove 50% of benzene; chemically transformed nanogold mixed with TiO2 could remove 41% of toluene;，physically transformed nanogold mixed with TiO2 could remove 41% of xylene. Most of the tested nano-particles could remove more than 50% of formaldehyde. Biologically and chemically transformed nanogold produced the best result for nitrogen monoxide reduction. For carbon monoxide oxidation, the reference material showed the best result. All the pollutant removing results were also observed in the test, which used the motorcycle exhausted gas as the pollutant source. There were differences of the pollutant-removing rate and the ability between the single pollutant system and the motorcycle exhausted gas. There was no antimicrobial activity for Escherichia coli (BCRC16081) and Salmonella choleraesuis (BCRC10747) in 48-hour test with the physically and chemically transformed nanogold particles, but the biologically transformed nanogold significantly inhibited the bacterial growth. Most of the tested nanoparticles inhibited the nitrogen removing reaction, but the biologically transformed nanogold could shorten the time of de-nitrification from 4 days to 3 days and could also increase the de-nitrification rate in the anammox reaction tested system. All the results showed that the nonogold materials have created some new application field. For successful application of the nanogold in the environmental protection, it is necessary to do the more researches to understand the mechanisms of the pollutant removing reactions.
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