[B-PT03] Biomineralization and Geochemistry of Proxies

[BPT03-05] Metal Accumulation Using a Bacterium (K-142) Identified from Environmental Microorganisms by the Screening of Au Nanoparticles Synthesis

*YITING LI¹, MICHIO SUZUKI¹ (1.The University of Tokyo)

Keywords:Bacillus, metal, environmental microorganisms, screening, nanoparticles

The rapid development of science and technology has also brought about an increasing amount of industrial waste. Among them, the metal resources discarded after utilization are often regarded as one of the main causes of environmental pollution. The use of technology that uses organisms to synthesize metal nanoparticles is necessary to maintain a sustainable society. In this study, we investigated and screened the microorganisms isolated from environmental water by quantifying the reproducibility of synthetic Au nanoparticles and the ability of large amount synthesis. The microorganism (K-142) of the Bacillus genus showed the best activity in the investigation. K-142 can also synthesize Ag, CdS and PbS nanoparticles, and the deposition efficiency of Ag, Al, Cd, Cu, and Pb was about 64.8–99.2%. According to the observation results under the microscope after fluorescent staining, K-142 could survive after being treated with 0.5 mM metal solution for 24 h. Therefore, it is expected that K-142, which is easy to cultivate, would also have a high ability to reduce and deposit metal substances. It may be a good way to apply K-142 to the concentration and recovery of heavy metals in environmental water, thereby opening up channels for biological water purification.