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Materials 2017, 10(10), 1144; doi:10.3390/ma10101144

Novel Aluminum Oxide-Impregnated Carbon Nanotube Membrane for the Removal of Cadmium from Aqueous Solution

1
Center for Environment and Water (CEW), Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
2
Department of Mechanical Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
3
Department of Chemical Engineering, Qatar University, Doha 2713, Qatar
4
College of Science and Engineering, Hamad Bin Khalifa University, Qatar Foundation, Doha 5825, Qatar
*
Authors to whom correspondence should be addressed.
Received: 13 August 2017 / Revised: 11 September 2017 / Accepted: 12 September 2017 / Published: 28 September 2017
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Abstract

An aluminum oxide-impregnated carbon nanotube (CNT-Al2O3) membrane was developed via a novel approach and used in the removal of toxic metal cadmium ions, Cd(II). The membrane did not require any binder to hold the carbon nanotubes (CNTs) together. Instead, the Al2O3 particles impregnated on the surface of the CNTs were sintered together during heating at 1400 °C. Impregnated CNTs were characterized using XRD, while the CNT-Al2O3 membrane was characterized using scanning electron microscopy (SEM). Water flux, contact angle, and porosity measurements were performed on the membrane prior to the Cd(II) ion removal experiment, which was conducted in a specially devised continuous filtration system. The results demonstrated the extreme hydrophilic behavior of the developed membrane, which yielded a high water flux through the membrane. The filtration system removed 84% of the Cd(II) ions at pH 7 using CNT membrane with 10% Al2O3 loading. A maximum adsorption capacity of 54 mg/g was predicted by the Langmuir isotherm model for the CNT membrane with 10% Al2O3 loading. This high adsorption capacity indicated that adsorption was the main mechanism involved in the removal of Cd(II) ions. View Full-Text
Keywords: membrane; carbon nanotubes; aluminum oxide; cadmium; toxic metal membrane; carbon nanotubes; aluminum oxide; cadmium; toxic metal
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Ihsanullah; Patel, F.; Khraisheh, M.; Atieh, M.A.; Laoui, T. Novel Aluminum Oxide-Impregnated Carbon Nanotube Membrane for the Removal of Cadmium from Aqueous Solution. Materials 2017, 10, 1144.

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