Highly efficient adsorption of hexavalent chromium from the aqueous system using nanoporous carbon modified with tetraethylenepentamine

Abstract

An oxidized mesoporous carbon material, modified with tetraethylenepentamine, has been developed as a highly efficient adsorbent for hexavalent chromium. Influence of parameters such as adsorbent dose (0.1-0.8 g L -1 ) solution pH (1-9), contact time, and initial concentration (100-1,000 mg L -1 ) on adsorption capacity has been investigated and optimized. The sorption equilibrium was reached within 60 min. The structural order and textural properties of the synthesized material were studied by X-ray diffraction, scanning electron microscopy, Fourier transform infrared, and nitrogen adsorptiondesorption analysis. The experimental results were analyzed by the Langmuir and Freundlich isotherms. The maximum adsorption capacity of 510 mg g -1 at an initial concentration of 1,000 mg L -1 is well predicted by the Freundlich isotherm. The kinetic analysis indicated that the adsorption process was successfully fitted with the pseudofirst-order kinetic model. Compared to other adsorbents reported in the literature, the modified nanoporous carbon material prepared in this study is found to be highly efficient adsorbent for the removal of hexavalent chromium from wastewater.

Synthesis of poly(amidoamine)-graft-poly(methyl acrylate) magnetic nanocomposite for removal of lead contaminant from aqueous media

“…Nowadays, numerous well-known methods such as chemical precipitation (Pang et al 2011), membrane filtration (Song et al 2011), ion exchange (Wdjtowicz and Stokmosa 2002), electrochemical treatment technologies (Belkacem et al 2008) and adsorption (Jiang et al 2015;Ghaffari et al 2015;Tan et al 2012;Mahmoud et al 2013) have been extensively explored for the removal and extraction of heavy metals from water/wastewater media. Among these water treatment methods, adsorption is one of the most effective and economic routes that have been widely used for removal of heavy metals.…”