Luo Yan, Huang Jianguo
Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310027 (P. R. China).
Chemistry. 2015 Feb 2;21(6):2568-75. doi: 10.1002/chem.201405066. Epub 2014 Dec 8.
Bulk hierarchical anatase-titania/cellulose composite sheets were fabricated by subjecting an ultrathin titania gel film pre-deposited filter paper to a solvo-co-hydrothermal treatment by using titanium butoxide as the precursor to grow anatase-titania nanocrystallites on the cellulose nanofiber surfaces. The titanium butoxide specie is firstly absorbed onto the nanofibers of the cellulose substance through a solvothermal process, which was thereafter hydrolyzed and crystallized upon the subsequent hydrothermal treatment, leading to the formation of fine anatase-titania nanoparticles with sizes of 2-5 nm uniformly anchored on the cellulose nanofibers. The resulting anatase-titania/cellulose composite sheet shows a significant photocatalytic performance towards degradation of a methylene blue dye, and introduction of silver nanoparticles into the composite sheet yields an Ag-NP/anatase-titania/cellulose composite material possessing excellent antibacterial activity against both Gram-positive and Gram-negative bacteria.
通过使用丁醇钛作为前驱体，对预先沉积在滤纸上的超薄二氧化钛凝胶膜进行溶剂共水热处理，在纤维素纳米纤维表面生长锐钛矿型二氧化钛纳米微晶，从而制备出块状分层锐钛矿型二氧化钛/纤维素复合片材。丁醇钛物种首先通过溶剂热过程被纤维素物质的纳米纤维吸收，随后在后续的水热处理中水解并结晶，导致形成尺寸为2-5纳米的细小锐钛矿型二氧化钛纳米颗粒均匀地锚定在纤维素纳米纤维上。所得的锐钛矿型二氧化钛/纤维素复合片材对亚甲基蓝染料的降解表现出显著的光催化性能，并且将银纳米颗粒引入复合片材中可得到对革兰氏阳性菌和革兰氏阴性菌均具有优异抗菌活性的Ag-NP/锐钛矿型二氧化钛/纤维素复合材料。
