期刊
ACS OMEGA
卷 1, 期 6, 页码 1253-1261出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.6b00406
关键词
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资金
- German Research Foundation: Generation of multifunctional inorganic materials by molecular bionics [SPP 1569]
- Graduate Academy Dresden
- Excellence Initiative of Germany and Saxony
Diatoms are unicellular algae of enormous biodiversity that occur in all water habitats on earth. Their cell walls are composed of amorphous biosilica and exhibit species-specific nanoporous to microporous and macroporous patterning. Therefore, diatom biosilica is a promising renewable material for various applications, such as in catalysis, drug-delivery systems, and biophotonics. In this study, diatom biosilica of three different species (Stephanopyxis turris, Eucampia zodiacus, and Thalassiosira pseudonana) was used as support material for gold nanoparticles using a covalent coupling method. The resulting catalysts were applied for the oxidation of D-glucose to D-gluconic acid. Because of its high specific surface area, well-established transport pores, and the presence of small, homogeneously distributed gold nanoparticles on the surface, diatom biosilica provides a highly catalytically active surface and advanced accessibility to the active sites. In comparison to those of the used reference supports, higher catalytic activities (up to 3.28 x 10(-4) mmol(Glc) s(-1) mg(Au)(-1) for T. pseudonana biosilica) and slower deactivation were observed for two of the diatom biosilica materials. In addition, diatom biosilica showed very high gold-loading capacities (up to 45 wt %), with a homogeneous nanoparticle distribution.
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