title: Removal of arsenic from water by iron oxide nanoparticles impregnated on carbon nanotubes.
abstract: The removal of Arsenic (As (III)) ions from water using modified multi-walled carbon nanotubes (MCNTs) was demonstrated in this study. Results of the study showed that raw (non-modified) MCNTs have very poor efficiency in removing As (III) from water by conventional adsorption mechanisms. However, when MCNTs were modified with iron oxide (Fe-MCNTs), a significant improvement in the As (III) removal efficiency was observed. Results of the study also showed that Fe-MCNTs have much higher efficiency in removing As (III) than MCNTs modified with carboxyl group (COOH-MCNTs). Under the experimental conditions used in the study, about 77.5% of As (III) removal was achieved by the Fe-MCNTs, while COOH-MCNTs removed only 11% at pH 5. In addition, the adsorption kinetics of MCNTs indicated that there is a strong affinity of As (III) ions to the surface of the Fe-MCNTs.
authors.affiliation: Earth Sciences Department, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia.
authors.forename: Bassam S
authors.initials: BS
authors.lastname: Tawabini
authors.forename: Salman F
authors.initials: SF
authors.lastname: Al-Khaldi
authors.forename: Mazen M
authors.initials: MM
authors.lastname: Khaled
authors.forename: Muataz A
authors.initials: MA
authors.lastname: Atieh
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000032:analysis* / Q000737:chemistry; D052918:Environmental Restoration and Remediation / Q000379:methods*; D005290:Ferric Compounds / Q000737:chemistry*; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D005290:Ferric Compounds; D037742:Nanotubes, Carbon; D014874:Water Pollutants, Chemical; C000499:ferric oxide; D001151:Arsenic