Selective Adsorption and Determination of Hexavalent Chromium in Water Samples by Chemically Modified Activated Carbon with Tris(hydroxymethyl)aminomethane

Abstract

This study introduces a sensitive and simple method for selective adsorption of hexavalent chromium, Cr(VI), from water samples prior to its determination by inductively coupled plasma optical emission spectrometry (ICP-OES). The method utilized activated carbon modified with tris(hydroxymethyl)aminomethane (AC-TRIS) as an adsorbent. Surface properties of the new chemically modified AC-TRIS phase were confirmed by Fourier transform infrared (FTIR) spectroscopy. Seven metal ions, including Co(II), Cu(II), Ni(II), Pb(II), Cr(III), Cr(VI), and Fe(III) were evaluated and determined at different pH values (1.0-8.0), except for Fe(III) at pH values (1.0-4.0). Based on the results of the effect of pH on adsorption of these metal ions on AC-TRIS, Cr(VI) was selected for the study of other parameters controlling its maximum uptake on AC-TRIS under batch conditions and at the optimum pH value 1.0. The maximum static adsorption capacity of Cr(VI) onto the AC-TRIS was found to be 43.30 mg g À1 at this pH and after 1 hour contact time. The adsorption data of Cr(VI) were modeled using both Langmuir and Freundlich classical adsorption isotherms. Results demonstrated that the adsorption of Cr(VI) onto AC-TRIS followed a pseudo second-order kinetic model. In addition, the efficiency of this methodology was confirmed by applying it to real environmental water samples.

Selective Iron(III) ion uptake using CuO-TiO2 nanostructure by inductively coupled plasma-optical emission spectrometry

“…SPE is considered to be one of the most powerful methods because it minimized the solvent usage and exposure, disposal costs, and extraction time for sample preparation. Several adsorbents have appeared due to the popularity of SPE for selective extraction of analytes, such as alumina [44], C18 [45], molecular imprinted polymers, cellulose [46], silica-gel [47,48], activated carbon [49,50] and carbon nanotubes [51,52]. This study was also planned to perform the analytical efficiency of CuO-TiO 2 NSs phase as adsorbent on the selectivity and adsorption capacity of Fe(III) prior to its determination by ICP-OES.…”

Adsorption of Cd(II) Ions onto Activated Carbon Prepared from Hazelnut Husks

“…[4][5][6][7][8][9] Adsorption technique is more preferable due to effectiveness and cheapness on the treatment of wastewater containing metal ions, especially, at low concentration. Modified silica gel, activated carbon (AC), chitin, chitosan, XAD resin, and various functionalized polymers have been tested as an adsorbent for the removal and=or preconcentration metal ions.…”

Sulfone-modified chitosan as selective adsorbent for the extraction of toxic Hg(II) metal ions

“…Among the various treatments, the adsorption technique is the most frequently used method. Solvent extraction has been used as an efficient method owing to effective extraction, selective separation, and economical costs (Biparva and Hadjmohammadi, 2011;Dave et al, 2010;Diniz and Volesky, 2005;Hang et al, 2002;Jain et al, 2001;Jankowski et al, 2005;Jelinek et al, 2007;Kim et al, 2006;Lemos et al, 2008;Liang et al, 2005;Marwani et al, 2012aMarwani et al, , 2012bMashhadizadeh et al, 2008;Pasinli et al, 2005;Rauf et al, 1993;Zhang et al, 2007). The use of adsorbents containing natural polymers has generated great interest, especially regarding polysaccharides such as chitin and its derivate, chitosan (Crini, 2005;Kurita, 2006;Varma et al, 2004).…”