金纳米粒子装饰的硅藻生物二氧化硅：氧化d-葡萄糖的有利催化剂,ACS Omega

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金纳米粒子装饰的硅藻生物二氧化硅：氧化d-葡萄糖的有利催化剂
ACS Omega ( IF 3.7 ) Pub Date : 2016-12-16 00:00:00 , DOI: 10.1021/acsomega.6b00406
Cathleen Fischer ₁ , Marion Adam ₁ , Andrea Christiane Mueller ₁ , Evgeni Sperling ₁ , Martin Wustmann ₁ , Karl-Heinz van Pée ₁ , Stefan Kaskel ₁ , Eike Brunner ₁

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硅藻是存在于地球上所有水生境中的具有巨大生物多样性的单细胞藻类。它们的细胞壁由无定形的生物二氧化硅组成，并显示出特定于物种的纳米孔至微孔和大孔图案。因此，硅藻生物二氧化硅是一种有前途的可再生材料，可用于各种应用，例如催化，药物输送系统和生物光子学。在这项研究中，采用共价偶联法将三种不同物种（Stephanopyxis turris，Eupcampia zodiacus和Thalassiosira pseudonana）的硅藻生物二氧化硅用作金纳米粒子的支撑材料。将所得的催化剂用于将d-葡萄糖氧化为d-葡萄糖酸。由于其高的比表面积，完善的传输孔以及表面上均匀分布的小金纳米颗粒的存在，硅藻生物二氧化硅提供了高催化活性的表面和对活性位点的先进可达性。与使用的参考载体相比，两种硅藻生物二氧化硅材料均具有较高的催化活性（对于假单胞菌生物二氧化硅高达3.28×10 ^–4 mmol _Glc s ^–1 mg _Au^–1）和失活较慢。另外，硅藻生物二氧化硅显示出非常高的载金能力（高达45重量％），具有均匀的纳米颗粒分布。

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Gold Nanoparticle-Decorated Diatom Biosilica: A Favorable Catalyst for the Oxidation of d-Glucose

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 × 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.

更新日期：2016-12-16

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