Magnetic carbon nanotubes synthesis by Fenton's reagent method and their potential application for removal of azo dye from aqueous solution

摘要: We report a simple and easy method to fabricate magnetic carbon nanotubes (CNTs) by Fenton's reagent without the addition of any cations. H(2)O(2) was added slowly into FeSO(4) solution mixed with purified CNTs, resulting reactants were placed quartz tube undergo heat treatment under nitrogen/hydrogen flow. Iron oxide (Fe(2)O(3)) nanoparticles uniformly dispersed on CNTs pretreatment such as strong acid or covalent functionalization processes. The as-produced used an adsorbent for removal methyl orange (MO) dye from aqueous solutions. Adsorption experiments indicated that have good adsorption capacity (q(e)) MO (28 mg/g). Freundlich isotherm model fitted experiment data better than Langmuir mode. mean energy calculated 3.72 kJ/mol based Dubinin-Radushkevich model, which suggests process dominated physical adsorption. Kinetic regression results showed kinetics more accurately represented pseudo second-order model. Intra-particle diffusion involved in process, but it not only rate-controlling step. More importantly, new photocatalytic regeneration technology can be enabled high nanoscale iron loading (50%). CNT adsorbents could effectively quickly separated applying external field regenerated UV photocatalysis. Therefore, CNTs/λ-Fe(2)O(3) hybrid is promising nanomaterial preconcentration separation organic pollutants environmental remediation.