Preparation and characteristics of biosilica derived from marine diatom biomass of Nitzschia closterium and Thalassiosira

• Published in: Chinese journal of oceanology and limnology Vol. 35; no. 3; pp. 668 - 680
• Main Author: 漆亚瑢 王欣 成家杨
• Format: Journal Article
• Language: English
• Published: Heidelberg Science Press 01.05.2017; Springer Nature B.V
• Subjects: Algae; Area; Baking; Biomass; Biosensors; Chemistry; Closterium; Diatomaceous earth; Diatomites; Diatoms; Drug delivery; Earth and Environmental Science; Earth Sciences; Fibers; Heat treatment; Marine; Marine ecology; Nitzschia closterium; Oceanography; Porous materials; Silica; Silicon dioxide; SiO2含量; Surface area; Thalassiosira; Washing; 制备; 多孔结构; 新月菱形藻; 无定形二氧化硅; 海洋硅藻; 生物量; 表征; biosilica; diatom; preparation
• ISSN: 0254-4059; 2096-5508; 1993-5005; 2523-3521
• DOI: 10.1007/s00343-017-5329-9

In this study, biosilica of high purity was successfully prepared from marine diatom （Nitzschia closterium and Thalassiosira） biomass using an optimized novel method with acid washing treatment followed by thermal treatment of the biomass. The optimal condition of the method was 2% diluted HCl washing and baking at 600℃. The SiO2 contents of N. closterium biosilica and Thalassiosira biosilica were 92.23% and 91.52%, respectively, which were both higher than that of diatomite biosilica. The SiO2 morphologies of both biosilica are typical amorphous silica. Besides, IV. closterium biosilica possessed micropores and fibers with a surface area of 59.81 m^2/g. And Thalassiosira biosilica possessed a mesoporous hierarchical skeleton with a surface area of 9.91 m^2/g. The results suggest that the biosilica samples obtained in this study present highly porous structures. The prepared porous biosilica material possesses great potential to be used as drug delivery carrier, biosensor, biocatalyst as well as adsorbent in the future.