Spherical Polyelectrolyte Brush Nanoreactor: Preparation of Hollow TiO2 Nanospheres and Characterization by Small Angle X-Ray Scattering

IF 4.1 2区化学 Q2 POLYMER SCIENCE Chinese Journal of Polymer Science Pub Date : 2024-08-08 DOI:10.1007/s10118-024-3202-9

Yu-Hua Zhang, Zi-Yu Zhang, Xin Liu, En-Guang Ma, Jiang-Tao Guo, Li Li, Xu-Hong Guo

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Abstract

Titanium dioxide (TiO₂) hollow nanoparticles present significant potential for photocatalytic applications while their straightforward preparation with precise structure control is still challenging. This work reports the approach to preparing tunable hollow TiO₂ nanospheres by utilization of spherical polyelectrolyte brushes (SPB) as nanoreactors and templates. During the preparation, the evolution of the structure was characterized by small angle X-ray scattering (SAXS), and in combination with dynamic light scattering and transmission electron microscopy. The formation of TiO₂ shell within the brush (SPB@TiO₂) is confirmed by the significant increase of the electron density, and its internal structure has been analyzed by fitting SAXS data, which can be influenced by Titanium precursors and ammonia concentration. After calcining SPB@TiO₂ in a muffle furnace, hollow TiO₂ nanospheres are produced, and their transition to the anatase crystal form is triggered, as confirmed by X-ray diffraction analysis. Utilizing the advantages of their hollow structure, these TiO₂ nanospheres exhibit exceptional catalytic degradation efficiency of methylene blue (MB), tetracycline (TC), and 2,4-dichlorophenoxyacetic acid (2,4-D), and also demonstrate excellent recyclability.

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球形聚电解质刷纳米反应器：中空二氧化钛纳米球的制备和小角 X 射线散射表征

二氧化钛（TiO2）空心纳米粒子在光催化应用方面具有巨大潜力，但直接制备并精确控制其结构仍具有挑战性。这项工作报告了利用球形聚电解质刷（SPB）作为纳米反应器和模板制备可调空心二氧化钛纳米球的方法。在制备过程中，利用小角 X 射线散射（SAXS）并结合动态光散射和透射电子显微镜对结构的演变进行了表征。电子密度的显著增加证实了碳刷（SPB@TiO2）内部 TiO2 壳的形成，并通过拟合 SAXS 数据分析了其内部结构，该结构会受到钛前体和氨浓度的影响。经 X 射线衍射分析证实，在马弗炉中煅烧 SPB@TiO2 后，产生了空心 TiO2 纳米球，并引发了其向锐钛矿晶体形态的转变。利用其中空结构的优势，这些二氧化钛纳米球对亚甲蓝（MB）、四环素（TC）和 2,4-二氯苯氧乙酸（2,4-D）具有卓越的催化降解效率，并表现出良好的可回收性。

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来源期刊

Chinese Journal of Polymer Science 化学-高分子科学

CiteScore

7.10

自引率

11.60%

发文量

218

审稿时长

6.0 months

期刊介绍： Chinese Journal of Polymer Science (CJPS) is a monthly journal published in English and sponsored by the Chinese Chemical Society and the Institute of Chemistry, Chinese Academy of Sciences. CJPS is edited by a distinguished Editorial Board headed by Professor Qi-Feng Zhou and supported by an International Advisory Board in which many famous active polymer scientists all over the world are included. The journal was first published in 1983 under the title Polymer Communications and has the current name since 1985. CJPS is a peer-reviewed journal dedicated to the timely publication of original research ideas and results in the field of polymer science. The issues may carry regular papers, rapid communications and notes as well as feature articles. As a leading polymer journal in China published in English, CJPS reflects the new achievements obtained in various laboratories of China, CJPS also includes papers submitted by scientists of different countries and regions outside of China, reflecting the international nature of the journal.