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Published on: April 7, 2017
Complex interior and surface modified alginate reinforced reduced graphene oxide-hydroxyapatite hybrids: Removal of
P Sirajudheen1, Perumal Karthikeyan2, Sivakumar Vigneshwaran2
1Department of Chemistry, The Gandhigram Rural Institute - Deemed to be University, Gandhigram, Dindigul, Tamil Nadu 624 302, India; Department of Chemistry, Pocker Sahib Memorial Orphanage College, Tirurangadi, Malappuram, Kerala 676306, India.
Abstract:
In this study, alginate reinforced reduced graphene oxide@hydroxyapatite (rGO@HAP-Alg) hybrids have been fabricated via co-precipitation technique. The developed adsorbent was effectively utilized for the removal of Reactive Blue 4 (RB4), Indigo Carmine (IC) and Acid Blue 158 (AB158) azo dyes from aqueous solution, and found to have the adsorption efficiency of 45.56, 47.16 and 48.26 mg/g, respectively. The thermodynamic parameters demonstrated the endothermic and spontaneous nature of the adsorption process. The adsorption system was pH-dependent and showed maximum dye removal at pH 6-7, which was indicative of the electrostatic interactions, surface complexation and the hydrogen bonding mechanisms involved between the adsorbate and adsorbent during the adsorption process. Furthermore, the renewability studies demonstrated the reusability and stability of rGO@HAP-Alg hybrids up to five successive cycles. This study delivers a promising strategy for removing dye molecules and extends the potential application of rGO@HAP-Alg hybrids to treat practical dye contaminated water/wastewater.
