We started working on the purification of SW carbon nanotubes made by HiPco process. Can someone give me an idea about how to remove completely iron metal from the nanotubes?
Thank you Sujata for you answer. Could you please give more details about the treatment conditions.
Dr. Kaddami, you can use concentarted HNO3 twice with reflux overnight, but you must check if this procedure cause hydroxylation of you CNTs. I use HNO3 with ultrasound for 20 min in order to homogenize the slurry.
Martinez, M. T.; Callejas, M. A.;
Benito, A. M.; Maser, W. K.;
Cochet, M.; Andre´s,J.M.;
Schreiber, J.; Chauvet, O.; Fierro,
J. L. G. Microwave Single Walled
Carbon Nanotubes Purification.
Chem. Commun. 2002, 9,
1000–1001.
Hi Every body. Thanks to all of you for your help. I will try your suggestions.
Kind regards
For HNO3 treatment check Rosca paper in Carbon 2005. If you want try other acid treatment, check Galiotis paper in CArbon 2008, if you would like to know its effect on properties, look at my papers.
Best regards
Look up on the following article: CARBON 46 (2008) 2003–2025
In the following link you can obtain a copy:
http://ch.imr.ac.cn/bitstream/321006/32809/1/163.pdf
the best acid for removing the catalyst particles is 30% w/w of nitric in water,but if your catalyst contains Co,Fe or Ni using phosphoric acid is better as I have used before, but try to use nitric because after refining the CNT's but heating the samples the acid will dissociated.
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