棒状纳米微晶纤维素诱导制备花状TiO2纳米晶体

doi:10.3724/SP.J.1077.2012.11701

无机材料学报 ›› 2012, Vol. 27 ›› Issue (10): 1068-1072.DOI: 10.3724/SP.J.1077.2012.11701 CSTR: 32189.14.SP.J.1077.2012.11701

棒状纳米微晶纤维素诱导制备花状TiO₂纳米晶体

彭新艳, 丁恩勇

(华南理工大学材料科学与工程学院, 广州 510640)

收稿日期:2011-11-09 修回日期:2011-12-26 出版日期:2012-10-20 网络出版日期:2012-09-17
作者简介:彭新艳(1985-), 女, 博士研究生. E-mail: pengxy1055@163.com
基金资助:
国家自然科学基金(50873038)

Preparation and Characterization of Flower-like TiO₂ Induced by Rod-like Nanocrystalline Cellulose

PENG Xin-Yan, DING En-Yong

(College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China)

Received:2011-11-09 Revised:2011-12-26 Published:2012-10-20 Online:2012-09-17
About author:PENG Xin-Yan. E-mail: pengxy1055@163.com
Supported by:
National Natural Science Foundation of China (50873038)

摘要/Abstract

摘要： 以棒状纳米微晶纤维素(Nanocrystalline cellulose, NCC)为形貌诱导剂, TiCl₄为原料, 采用水解法在70℃的温度下反应4~6 h, 制备了TiO₂花状纳米晶体. 采用TEM、HRTEM、XRD和FTIR对不同条件下制得的TiO₂晶体的微观形貌、晶粒尺寸和晶相组成进行了表征, 探讨了TiCl₄的用量及反应时间对晶体形貌和晶型的影响, 并对其形成机理进行分析. 纳米微晶纤维素表面富含大量羟基, 可与TiO₂之间形成氢键连接, 促使TiO₂在其表面的异质成核和生长, 同时纳米微晶纤维素在TiO₂表面的吸附作用, 改变了各晶面的表面能和生长速度, 使TiO₂沿着[110] 方向优先生长形成一维针状物, 针状物再进一步聚集形成花状聚集体. 以甲基橙为目标污染物, 测试了所得TiO₂纳米花状晶体的光催化性能. 结果表明, 随着TiCl₄用量的增多及反应时间的延长, 所制得的TiO₂纳米晶体中金红石含量增多, 形貌逐渐复杂化, 光催化性能下降.

关键词: 纳米微晶纤维素, 二氧化钛, 花状, 四氯化钛

Abstract: Flower-like titania nanocrystals were synthesized by hydrolysis of titanium (IV) chloride at a low temperature of 70℃ in 4–6 h, employing nanocrystal cellulose (NCC) as a morphology controlling agent. The obtained nanocrystals were characterized by transmission electron microscope (TEM), high-resolution transmission electron microscope (HRTEM), X-ray diffraction (XRD) and FTIR. TEM and HRTEM investigations reveal that the morphologies of the nancrystals are flower-like, and each flower is composed of several nanoneedles with a diameter of 15–20 nm and a length of 100–200 nm. The XRD results show that the crystalline phase of the nanocrystals have a strong dependence on the mole ratio of TiCl₄ to H₂O and the reaction time. FTIR result shows that a chemical bond is formed between NCC and TiO₂. A possible growth mechanism is proposed based on the characteristic results. The NCC whose surface is full of hydrophilic groups can establish hydrogen bonding with TiO₂ to promote the nucleation and crystal growth of TiO₂ at low temperature. Moreover, the selective adsorption of NCC molecules on the crystal face of TiO₂ varies the growth rate of different crystal planes, and the anisotropic crystal growth leads to the formation of nanoneedles. Then these nanoneedles aggregate together to assemble into a flower-like secondary structure. TiO₂ prepared at low temperature exhibites high activity in the photocatalytic degradation of methyl orange in aqueous solution under metal halide lamp.

Key words: nanocrystal cellulose (NCC), titania, flower-like, titanium chloride

中图分类号:

TQ134

彭新艳, 丁恩勇. 棒状纳米微晶纤维素诱导制备花状TiO₂纳米晶体[J]. 无机材料学报, 2012, 27(10): 1068-1072.

PENG Xin-Yan, DING En-Yong. Preparation and Characterization of Flower-like TiO₂ Induced by Rod-like Nanocrystalline Cellulose[J]. Journal of Inorganic Materials, 2012, 27(10): 1068-1072.

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棒状纳米微晶纤维素诱导制备花状TiO₂纳米晶体

Preparation and Characterization of Flower-like TiO₂ Induced by Rod-like Nanocrystalline Cellulose

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