Nitrogen-functionalised carbon nanotubes as a novel adsorbent for the removal of Cu(ii) from aqueous solution

Abstract

Nitrogen-functionalized multiwalled carbon nanotubes synthesized were effective and efficient for the removal of Cu2+ from aqueous solutions.

Graphene Composites for Lead Ions Removal from Aqueous Solutions

“…Adsorption isotherms analysis was performed in a plastic vial using 10 mg or 25 mg adsorbent to a 100 or 200 mL solution of Pb(II) ions at room temperature. It is evident that the adsorption of positively-charged metal ions depend on the charge present on the surface of the adsorbents as functionalities [165,166]. Zeta potential of the adsorbents at different pH was determined using Nano-ZS, Zeta Sizer and correlated with the adsorption of Pb(II) ions.…”

“…These factors are responsible for maximizing Pb(II) ions uptake due to the increased mobility of Pb(II) ions towards active sites of the Effect of temperature is an important factor of study on which the adsorption phenomenon depends because the adsorption rate depends on the solution viscosity, electrostatic interactions between the metal ions and the adsorbent surface, diffusion of the adsorbents and structural morphology of the adsorbent at a particular temperature. These factors are responsible for maximizing Pb(II) ions uptake due to the increased mobility of Pb(II) ions towards active sites of the adsorbents [166,176,177]. It was noted that as the temperature increased, the adsorption capacities of GO and pRGO increased which were ascribed with the decreased viscosity of the medium, increased mobility of Pb(II) ions, and increased pore volume and structural porosity at a higher temperature indicating endothermic nature of adsorption whereas temperature rise sometime may lead to decreased in adsorptive forces affecting adsorption rate [166].…”

“…These factors are responsible for maximizing Pb(II) ions uptake due to the increased mobility of Pb(II) ions towards active sites of the adsorbents [166,176,177]. It was noted that as the temperature increased, the adsorption capacities of GO and pRGO increased which were ascribed with the decreased viscosity of the medium, increased mobility of Pb(II) ions, and increased pore volume and structural porosity at a higher temperature indicating endothermic nature of adsorption whereas temperature rise sometime may lead to decreased in adsorptive forces affecting adsorption rate [166]. Langmuir adsorption isotherms assumed uniform monolayer surface adsorption.…”

Uptake of Zn2+ and As3+ from Wastewater by Adsorption onto Imine Functionalized Magnetic Nanoparticles

“…An average adsorption efficiency of 80% and 90% in the real wastewater samples and 86% and 92% in the simulated water was obtained for Zn(II) and As(III) respectively (Tables 9 and 10). The relatively low adsorption efficiency for both metal ions in the real wastewater samples can be ascribed to the complexity of the matrix [37,51]. The co-existing of other ions and organic compounds competing for active sites on MNP-Maph with Zn(II) and As(III) may lead to a decrease in their uptake performance.…”

Adsorptive removal of aqueous bezafibrate by magnetic ferrite modified carbon nanotubes

“…The point of zero charge measurements and Boehm titration were performed according to the procedures described in elsewhere 29. High-performance liquid chromatographic (HPLC, Waters Alliance e2998, USA) method was established for the determination of BZF, and samples were performed on SunFire C18 of phosphate buffer (0.01 mol L À1 at pH 3.5)-methanol-acetonitrile (40 : 15 : 45, v/v/v) as mobile phase, at a ow rate of 1 mL min À1 .…”