{"title":"Synthesis of acid-base bi-functionalized multiwalled carbon nanotube using supercritical carbon dioxide","authors":"Maria Cristina Macawile, Joseph Auresenia","doi":"10.1007/s12039-023-02182-1","DOIUrl":null,"url":null,"abstract":"<div><p>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 CO<sub>2</sub> 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). ScCO<sub>2</sub> 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.</p><h3>Graphical abstract</h3><p>The use of supercritical CO<sub>2</sub> results in the synthesis of an acid-base bifunctionalized MWCNT. To graft the sulfonic and amine functional groups on MWCNT, 3-mercaptopropyltrimethoxysilane oxidized with H<sub>2</sub>O<sub>2</sub> 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.</p>\n <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\n </div>","PeriodicalId":50242,"journal":{"name":"Journal of Chemical Sciences","volume":"135 3","pages":""},"PeriodicalIF":1.7000,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Chemical Sciences","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s12039-023-02182-1","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"Chemistry","Score":null,"Total":0}
引用次数: 0
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.
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.