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Modification of carbon nanotubes by ball-milling to be used as ozonation catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
53727 46981 2015 5 PDF Available
Title
Modification of carbon nanotubes by ball-milling to be used as ozonation catalysts
Abstract

•Study of influence of ball-milling (BM) in texture and surface chemistry of MWCNT.•The textural and morphological properties of MWCNT are changed by BM treatment.•MWCNT surface area increases, whereas the particle size of agglomerates decreases.•BM is an effective and simple method to increase the MWCNT performance in ozonation.

The influence of ball-milling in the texture and surface chemistry of multi-walled carbon nanotubes (MWCNT) was studied in this work. Treatment times up to 360 min at constant frequency (15 vibrations/s) and frequencies from 10 to 20 vibrations/s during 30 min were used for the preparation of the modified samples. These were characterized by nitrogen adsorption at −196 °C, temperature programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The milled samples were used as catalysts for the ozonation of oxalic acid. The surface area of the MWCNT increases, whereas the particle size decreases with the ball-milling time until 240 min at 15 vibrations/s. The functionalization of MWCNT surface is not achieved by ball-milling under the conditions used. The catalytic performance of the ball-milled samples for oxalic acid mineralization increased significantly when compared to the unmilled MWCNT. Therefore, ball-milling is an effective and simple method to increase the surface area of commercial carbon nanotubes without significant changes of their structural properties, and, consequently, this method allows increasing their catalytic performance in ozonation processes.

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Keywords
Carbon nanotubes; Ball-milling; Textural properties; Ozonation; Oxalic acid
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Modification of carbon nanotubes by ball-milling to be used as ozonation catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 249, 1 July 2015, Pages 199–203
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us