Authors: Hamedreza Javadian Mousa Ghaemy Mehdi Taghavi
Publish Date: 2013/09/04
Volume: 49, Issue: 1, Pages: 232-242
Abstract
A nanocomposite of polyaniline/hexagonal mesoporous silica PAN/HMS was prepared and characterized by BET analysis transmission electron microscopy and FTIR spectra Batch adsorption results showed that PAN/HMS had high affinity to Hg2+ in aqueous solutions Various factors affecting the adsorption capacity such as contact time temperature absorbent dosage pH and initial concentration of Hg2+ ions were investigated The adsorption kinetics for the Hg2+ showed that the adsorption reached equilibrium within 8 min and adsorption rates followed the pseudosecondorder rate law indicating chemical sorption as the ratelimiting step of the adsorption mechanism Sorption of Hg2+ to PAN/HMS agreed well to the Langmuir adsorption model at different ionic strengths with the maximum adsorption capacity of 843 mg g−1 I = 1000 mg L−1 at pH 10 Thermodynamic studies revealed that the adsorption of Hg2+ ions was spontaneous exothermic processes with an increase of entropy The recovery of the Hg2+ from the adsorbent was found to be more than 88 using H2SO4 01 M and the ability of the absorbent to be reused was investigated
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