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Received August 16, 2013
Accepted April 8, 2014
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Adsorption of chromium (VI) on functionalized and non-functionalized carbon nanotubes
Nabisab Mujawar Mubarak1 2†
Raj Kogiladas Thines1
Noor Rosyidah Sajuni1
Ezzat Chan Abdullah3
Jaya Narayan Sahu4
Poobalan Ganesan5
Natesan Subramanian Jayakumar2
1Department of Chemical and Petroleum Engineering, Faculty of Engineering, UCSI University, Kuala Lumpur 56000, Malaysia 2Department of Chemical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia 3Malaysia - Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia, Jalan Semarak, Kuala Lumpur 54100, Malaysia 4Department of Petroleum and Chemical Engineering, Faculty of Engineering, Institut Teknologi Brunei, Tungku Gadong, P. O. Box 2909, Brunei Darussalam 5Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia
Korean Journal of Chemical Engineering, September 2014, 31(9), 1582-1591(10), 10.1007/s11814-014-0101-8
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Abstract
We did a comparative study on the adsorption capacity of Cr (VI) between functionalized carbon nanotubes (CNTs) and non-functionalized CNTs. The statistical analysis reveals that the optimum conditions for the highest removal of Cr (VI) are at pH 9, with dosage 0.1 gram, agitation speed and time of 120 rpm and 120 minutes, respectively. For the initial concentration of 1.0 mg/l, the removal efficiency of Cr (VI) using functionalized CNTs was 87.6% and 83% of non-functionalized CNTs. The maximum adsorption capacities of functionalized and non-functionalized CNTs were 2.517 and 2.49 mg/g, respectively. Langmuir and Freundlich models were adopted to study the adsorption isotherm, which provided a KL and KF value of 1.217 L/mg and 18.14 mg^(1-n)Ln/g functionalized CNT, while 2.365 L/mg and 2.307 mg^(1-n)Ln/g for non-functionalized CNTs. This result proves that functionalized CNTs are a better adsorbent with a higher adsorption capacity compared with the non-functionalized CNTs.
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