In situ growing directional spindle TiO2 nanocrystals on cellulose fibers for enhanced Pb2+ adsorption from water
In situ growing directional spindle TiO2 nanocrystals on cellulose fibers for enhanced Pb2+ adsorption from water
复制标题
在纤维素纤维上原位生长定向纺锤体 TiO2 纳米晶体以增强水中 Pb2 的吸附
DOI：
10.1016/j.jhazmat.2015.02.051
复制
发表时间：
2015-05-30
影响因子：
13.6
通讯作者：
Yang, Chuanfang
中科院分区：
文献类型：
--
作者：
Li, Yanxiang;Cao, Lixia;Yang, Chuanfang
通过TiOSO 4水解在纤维素纤维上原位生成二氧化钛（TiO 2）纳米晶，制备了TiO 2/纤维素纳米复合材料。纤维素是作为一个支架来包裹二氧化钛纳米粒子（NPs），但令人惊讶的是，原来也是一个化学模板，指导晶体生长。结果，纺锤形金红石TiO 2晶体很好地形成在纤维素表面上。进一步控制这些晶体均匀分散而不团聚，以更好地利用其表面积吸附重金属。结果表明，TiO 2/CF复合材料对Pb（2+）具有较高的吸附容量、良好的再生性能和选择性。此外，将复合纤维制成非织造布滤床，进行了动态过滤实验。在穿透发生之前，与纯CF床相比，TiO 2/CF床实现了过滤床体积的12倍增加。本工作为制备低成本、高效率、工程化应用的纳米吸附剂提供了一条绿色途径。(C)2015 Elsevier B. V.版权所有。
TiO2/cellulose nanocomposite was synthesized by in situ generation of titanium dioxide (TiO2) nanocrystals on cellulose fibers (CF) via facile hydrolysis of TiOSO4. Cellulose was intended as a scaffold to immobilize TiO2 nanoparticles (NPs), but turned out surprisingly to be also a chemical template that directed the crystal growth. As a result, spindle rutile TiO2 crystals were nicely formed on the surface of cellulose. These crystals were further controlled to disperse uniformly without agglomeration for better use of their surface area to adsorb heavy metals. The TiO2/CF composite showed enhanced adsorption capacity, good regenerability and selectivity for lead (Pb2+) removal. In addition, the composite fibers were readily fabricated into a nonwoven filter bed through which dynamic filtration experiment was conducted. A 12-fold increase in filtered bed volume was achieved for TiO2/CF bed compared with pure CF bed before breakthrough took place. This work provides a green pathway for fabricating low cost, high efficiency and engineering application possible nanosorbents for water decontamination. (C) 2015 Elsevier B.V. All rights reserved.