Facile synthesis of TiO2/CNC nanocomposites for enhanced Cr(VI) photoreduction: Synergistic roles of cellulose nanocrystals
Facile synthesis of TiO2/CNC nanocomposites for enhanced Cr(VI) photoreduction: Synergistic roles of cellulose nanocrystals
复制标题
DOI：
10.1016/j.carbpol.2020.115838
复制
发表时间：
2020-04-01
影响因子：
11.2
通讯作者：
Hsiao, Benjamin S.
中科院分区：
文献类型：
--
作者：
Li, Yanxiang;Zhang, Jinju;Hsiao, Benjamin S.
在本研究中，利用原位水解在纤维素纳米晶体（CNC）支架中合成了TiO2纳米晶体，其中TiO2的形态和尺寸由CNC的官能团和表面电荷控制。由于小 TiO2 尺寸和 CNC 与 TiO2 之间的配体到金属电荷转移 (LMCT) 络合物的综合作用，所得 TiO2/CNC 纳米复合材料在可见光 (lambda > 420 nm) 下表现出优异的 Cr(VI) 还原光催化活性。研究发现，电荷富集的 CNC 不仅充当指导 TiO2 晶体生长的模板，而且在光捕获和电荷转移方面发挥着重要作用，从而促进 Cr(VI) 的光还原。所演示的系统代表了一种开发低成本、高效净化材料来修复 Cr(VI) 的独特途径。
In this study, TiO2 nanocrystals were synthesized in the scaffold of cellulose nanocrystal (CNC) using in situ hydrolysis, where the morphology and size of TiO2 was controlled by CNC's functional groups and surface charge. The resulting TiO2/CNC nanocomposites showed a superior photocatalytic activity for Cr(VI) reduction under visible light (lambda > 420 nm) due to the combined effects of small TiO2 size and ligand-to-metal charge transfer (LMCT) complex between CNC and TiO2. It was found that the charge-enriched CNC not only acted as a template to direct the crystal growth of TiO2, but also played essential roles on light harvesting and charge transfer thereby promoting the photoreduction of Cr(VI). The demonstrated system represents a unique pathway to develop a lower cost and efficient purification material for remediation of Cr(VI).