A modified cellulose adsorbent for the removal of nickel(II) from aqueous solutions

Abstract

A series of adsorption studies was carried out on a glycidyl methacrylate-modified cellulose material functionalised with imidazole (Cellulose-g-GMA-Imidazole) to assess its capacity in the removal of Ni(II) ions from aqueous solution. The study sought to establish the effect of a number of parameters on the removal of Ni(II) from solution by the Cellulose-g-GMA-Imidazole. In particular, the influence of initial metal concentration, contact time, solution temperature and pH were assessed. The studies indicated a Ni(II) uptake on the Celluloseg-GMA-Imidazole sorbent of approximately 48 mg g −1 of nickel from aqueous solution. The adsorption process fitted the Langmuir model of adsorption and the binding process was mildly endothermic. The kinetics of the adsorption process indicated that nickel uptake occurred within 400 min and that pseudo-second order kinetics best describe the overall adsorption process. Nickel(II) adsorption, recovery and re-adsorption studies indicated that at highly acidic pH values the adsorbent material becomes unstable, but in the range pH 3-6, the adsorbent is stable and shows limited but significant Ni(II) recovery and re-adsorption capability.

Radiation-induced grafting of cellulose for adsorption of hazardous water pollutants: A review

“…The epoxide ring on opening generates new functional groups for chelate formation (Chauhan et al, 2005). Good adsorbent for Ni(II) (O'Connell et al, 2006c) can be obtained from GMA grafted cellulose by the introduction of imidazole group (Fig. 5).…”

“…Natural materials including cellulose, chitosan are renewable, biodegradable, cheap and available in large amount (O'Connell et al, 2008). These materials can be chemically modified for enhancing metal-binding ability by introduction of new functional groups (O'Connell et al, 2006c;Liu and Sun, 2008). There is an intensive research nowadays for their application for hazardous contaminant adsorption from aqueous wastes.…”

Poly(amidoxime) from Polymer-Grafted Khaya Cellulose: An Excellent Medium for the Removal of Transition Metal Cations from Aqueous Solution

“…Recently, an alternative reaction pathway of cellulose units, with primarily -OH groups, has been proposed (O'Connell et al 2006). In this mechanism, metal ions generate free radicals with the oxygen atoms from cellulose molecules, which consequently react with vinyl or acrylic monomers (O'Connell et al 2006).…”

Adsorption of chromium (VI) from aqueous solutions by cellulose modified with β-CD and quaternary ammonium groups

“…The poly(glycidyl methacrylate) [poly(GMA)] chains via polymerization of GMA were grafted on the surface of the cellulose using ceric ammonium nitrate as initiator [9]. In 500 mL round flask, cellulose (0.9 g) was initiated with CAN (0.12 mol) and 12 mL of 1 mol L −1 nitric acid in water (300 mL).…”