VO2(D) hollow core–shell microspheres: synthesis, methylene blue dye adsorption and their transformation into C/VOx nanoparticles†,Inorganic Chemistry Frontiers

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VO2(D) hollow core–shell microspheres: synthesis, methylene blue dye adsorption and their transformation into C/VOx nanoparticles†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-02-01 00:00:00 , DOI: 10.1039/c7qi00819h
Liangmiao Zhang _{1,

2,

3,

4} , Jianing Yao _{1,

2,

3,

4} , Fang Xia _{5,

6,

7,

8} , Yunfeng Guo _{1,

2,

3,

4} , Chuanxiang Cao _{1,

2,

3,

4} , Zhang Chen _{1,

2,

3,

4} , Yanfeng Gao _{1,

2,

3,

4} , Hongjie Luo _{1,

2,

3,

4}

Affiliation

In this work, we report the fabrication of novel VO₂(D) hollow core–shell microspheres (VO₂(D)-HCSMs) via a facile hydrothermal method. Microscopic examination revealed that the VO₂(D)-HCSMs consisted of numerous nanocrystals and had an average size of 1–10 μm and a shell thickness of 300 nm. An inside-out Ostwald ripening process was responsible for the formation of the VO₂(D)-HCSMs. Meanwhile, citric acid played dual roles, acting as a reductant for reducing vanadium pentoxide and as a morphology directing agent for producing core–shell microspheres. The resulting VO₂(D)-HCSMs exhibited excellent adsorption performance with a maximum adsorption capacity of 97.5 mg g⁻¹ for methylene blue (MB). The C/VO_x particles were generated by the calcination of the VO₂(D)-HCSMs with adsorbed MB dye at 250 °C in air for 4 h, and the microspheres showed enhanced adsorption capacity and good reusability (over 99% MB removal after four cycles) because of the existence of amorphous carbon nanowires, making them a potential adsorbent for removing organic dyes from wastewater.

中文翻译：

VO ₂（D）中空核-壳微球：合成，亚甲基蓝染料的吸附及其向C / VO _x纳米颗粒的转化†

在这项工作中，我们报告了通过简便的水热法制备新型VO ₂（D）中空核壳微球（VO ₂（D）-HCSMs）的过程。显微镜检查显示，VO ₂（D）-HCSMs由许多纳米晶体组成，平均大小为1–10μm，壳厚度为300 nm。由内而外的奥斯特瓦尔德（Ostwald）成熟过程负责形成VO ₂（D）-HCSM。同时，柠檬酸起着双重作用，既充当还原五氧化二钒的还原剂，又充当形成核-壳微球的形态学指导剂。所得VO ₂（D）-HCSMs表现出出色的吸附性能，最大吸附容量为97.5 mg g ^-1用于亚甲蓝（MB）。C / VO _x颗粒是通过在250°C的空气中将吸附有MB染料的VO ₂（D）-HCSMs在空气中煅烧4小时而生成的，微球显示出增强的吸附能力和良好的可重复使用性（去除99％以上的MB）（经过四个循环后），因为存在无定形碳纳米线，这使它们成为从废水中去除有机染料的潜在吸附剂。

更新日期：2018-02-01

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