Synthesis of acid-base bi-functionalized multiwalled carbon nanotube using supercritical carbon dioxide

IF 1.7 4区 化学 Q3 Chemistry Journal of Chemical Sciences Pub Date : 2023-06-23 DOI:10.1007/s12039-023-02182-1
Maria Cristina Macawile, Joseph Auresenia
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Abstract

A novel approach to surface modification of carbon-based nanomaterials using supercritical fluid was used in the synthesis of an acid-base bi-functionalized multiwalled carbon nanotubes (MWCNT). The oxidized thiol and amine groups were incorporated in series using supercritical CO2 at T=55 °C, P=9MPa, and t=1h. Successful functionalization was confirmed using Thermogravimetric analysis (TGA), Fourier transform infrared (FTIR), Field emission scanning electron microscopy–energy dispersive x-ray (FESEM-EDX), Time-of-flight secondary ion mass spectrometry (TOF-SIMS), X-ray powder diffraction (XRD), and Brunauer–Emmett-Teller (BET). ScCO2 functionalization was used to produce a bifunctional carbon-based material that maintained its structural integrity even after the addition of two incompatible functional groups on MWCNT.

Graphical abstract

The use of supercritical CO2 results in the synthesis of an acid-base bifunctionalized MWCNT. To graft the sulfonic and amine functional groups on MWCNT, 3-mercaptopropyltrimethoxysilane oxidized with H2O2 and 3-aminopropyltrimethoxysilane were utilized. This green surface modification method can replace any of the time-consuming, tedious, and solvent-waste-producing steps of conventional mixing.

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超临界二氧化碳合成酸碱双官能化多壁碳纳米管
采用超临界流体对碳基纳米材料进行表面改性,制备了酸碱双功能化多壁碳纳米管(MWCNT)。将氧化后的巯基和胺基在55℃,9MPa, 1h的超临界CO2条件下串联。通过热重分析(TGA)、傅里叶变换红外(FTIR)、场发射扫描电子显微镜-能量色散x射线(FESEM-EDX)、飞行时间二次离子质谱(TOF-SIMS)、x射线粉末衍射(XRD)和brunauer - emmet - teller (BET)等方法证实了功能化的成功。利用ScCO2功能化制备了一种双功能碳基材料,即使在MWCNT上添加了两个不相容的官能团,也能保持其结构完整性。图示:利用超临界CO2合成了酸碱双官能化MWCNT。利用H2O2氧化的3-巯基丙基三甲氧基硅烷和3-氨基丙基三甲氧基硅烷在MWCNT上接枝磺酸基和胺基官能团。这种绿色表面改性方法可以取代任何耗时、繁琐、产生溶剂废物的传统混合步骤。
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来源期刊
Journal of Chemical Sciences
Journal of Chemical Sciences Chemistry-General Chemistry
CiteScore
2.90
自引率
5.90%
发文量
107
审稿时长
12 months
期刊介绍: Journal of Chemical Sciences is a monthly journal published by the Indian Academy of Sciences. It formed part of the original Proceedings of the Indian Academy of Sciences – Part A, started by the Nobel Laureate Prof C V Raman in 1934, that was split in 1978 into three separate journals. It was renamed as Journal of Chemical Sciences in 2004. The journal publishes original research articles and rapid communications, covering all areas of chemical sciences. A significant feature of the journal is its special issues, brought out from time to time, devoted to conference symposia/proceedings in frontier areas of the subject, held not only in India but also in other countries.
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