In situ synthesis of photocatalytically active hybrids consisting of bacterial nanocellulose and anatase nanoparticles.
In situ synthesis of photocatalytically active hybrids consisting of bacterial nanocellulose and anatase nanoparticles.
复制标题
DOI：
10.1021/la302787z
复制
发表时间：
2012-09
期刊：
影响因子：
--
通讯作者：
Falko Wesarg;F. Schlott;J. Grabow;Heinz-Dieter Kurland;N. Hessler;D. Kralisch;F. Müller
中科院分区：
文献类型：
--
作者：
Falko Wesarg;F. Schlott;J. Grabow;Heinz-Dieter Kurland;N. Hessler;D. Kralisch;F. Müller
细菌纳米纤维素（BNC）是一种非凡的生物聚合物，具有广泛的潜在技术应用前景。纳米纤维BNC网络的高比表面积和相互连接的孔系统表明其作为催化剂载体的应用前景。本文介绍了一种原位改性方法，用于制备由BNC和光催化活性锐钛矿（TiO(2)）纳米颗粒（NPs）组成的杂化材料。研究了不同NP浓度对杂交种BNC生物合成及其超分子结构的影响。结果发现，与未修饰的BNC相比，菌落形成单位（cfu）的数量和生物合成过程中的葡萄糖消耗未受影响。在BNC网络的形成过程中，NPs被纳入累积混合的整个体积中。它们在杂化材料中的分布受BNC各向异性结构的影响。采用甲醇转化率法测定了BNC-TiO(2)杂化物在紫外照射下的光催化活性（PCA）。这些测试表明NPs在并入BNC载流子结构后保留了它们的PCA。杂化材料的PCA取决于掺入NPs的量。在重复的PCA测试中没有发现光催化剂效率的变化。综上所述，将光催化活性NPs原位集成到BNC中代表了将其应用领域扩展到饮用水净化和空气净化的多孔过滤介质的诱人可能性。
Bacterial nanocellulose (BNC) is an extraordinary biopolymer with a wide range of potential technical applications. The high specific surface area and the interconnected pore system of the nanofibrillar BNC network suggest applications as a carrier of catalysts. The present paper describes an in situ modification route for the preparation of a hybrid material consisting of BNC and photocatalytically active anatase (TiO(2)) nanoparticles (NPs). The influence of different NP concentrations on the BNC biosynthesis and the resulting supramolecular structure of the hybrids was investigated. It was found that the number of colony forming units (CFUs) and the consumption of glucose during biosynthesis remained unaffected compared to unmodified BNC. During the formation of the BNC network, the NPs were incorporated in the whole volume of the accruing hybrid. Their distribution within the hybrid material is affected by the anisotropic structure of BNC. The photocatalytic activity (PCA) of the BNC-TiO(2) hybrids was determined by methanol conversion (MC) under UV irradiation. These tests demonstrated that the NPs retained their PCA after incorporation into the BNC carrier structure. The PCA of the hybrid material depends on the amount of incorporated NPs. No alteration of the photocatalyst's efficiency was found during repeated PCA tests. In conclusion, the in situ integration of photocatalytically active NPs into BNC represents an attractive possibility to extend its fields of application to porous filtering media for drinking water purification and air cleaning.