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Removal of cadmium from water by CNT–PAC composite: effect of functionalization

AlSaadi, Mohammed A. and Mamun, Abdullah Al and Alam, Md Zahangir and Amosa, Mutiu Kolade and Atieh, Muataz Ali (2016) Removal of cadmium from water by CNT–PAC composite: effect of functionalization. NANO: Brief Reports and Reviews, 11 (1). 1650011-1-1650011-7. ISSN 1793-2920

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Abstract

Cadmium (Cd2þ) is one of the toxic heavy metals that is frequently used in many industrial products. The wastewater from these industries and their products contains residual cadmium that are di±cult to be removed economically from the e®luent. Carbon nanotubes (CNTs) were synthesized in several batches and tested for their removal e±cacy with regards to cadmium removal from synthetic wastewater. Fixed catalyst chemical vapor deposition (FCCVD) reactor system was fabricated in the laboratory for the synthesis of CNTs on the powdered activated carbons (PACs). The PACs were impregnated with Fe3þ catalysts, and growth parameters such as, the reaction time, gas °ow rates and reaction temperature were optimized. The sorption capacity of the raw CNT–PAC was not satisfactory until the sorbents were functionalized which eventually led to high adsorption capacities. The surface properties of CNT–PAC were modi¯ed by oxidative functionalization using two di®erent methods: sonication with KMnO4 and re°uxing with HNO3 at 140�C. KMnO4-treated CNT–PAC exhibited the highest sorption capacity for cadmium uptake which increased from 4.77 mg/g (untreated CNT–PAC) to 11.16 mg/g; resulting in Cd2þ removal e±ciency from 38.87% to 98.35%.

Item Type: Article (Journal)
Additional Information: 5174/46622
Uncontrolled Keywords: Adsorption; Cadmium; CNTs; functionalization; wastewater
Subjects: T Technology > TD Environmental technology. Sanitary engineering > TD169 Environmental protection
Kulliyyahs/Centres/Divisions/Institutes: Kulliyyah of Engineering > Department of Biotechnology Engineering
Depositing User: Dr Abdullah Al Mamun
Date Deposited: 05 Apr 2016 09:22
Last Modified: 21 Oct 2017 19:24
URI: http://irep.iium.edu.my/id/eprint/46622

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