Graphene oxide modified with carboxymethyl cellulose for high adsorption capacities towards Nd(III) and Ce(III) from aqueous solutions

Abstract

This work addresses a simple method to functionalize graphene oxide with sodium carboxymethyl cellulose using tetraethyl orthosilicate as a linker for rapid and significant removal of Nd(III) and Ce(III) from aqueous solutions. The prepared composite (GO–CMC) was characterized by different techniques to confirm the modification and adsorption process. The sorption performance of the GO–CMC was evaluated using Nd(III) and Ce(III) as absorbent materials. The experimental results demonstrated that the sorption process was excellently fitted by the pseudo-second-order kinetic model. The adsorption results were also analyzed by different isotherm models. According to the Langmuir isotherm model, the experimental sorption capacities at pH 3.0 was 661.21 and 436.55 mg/g for Nd(III) and Ce(III), respectively. The thermodynamic results indicated that the sorption process of the two examined metal ions was endothermic and spontaneous. The regenerated GO–CMC composite has a similar removal percentage to the original composite. These results confirmed that the prepared composite (GO–CMC) could be used as an effective adsorbent for Nd(III) and Ce(III) from certain multielement solutions.

Toward In Situ Sequestration of Multicomponent PFAS Using Injectable Adsorbent Suspensions

“…The enhancement solution contained 3 constituents: an anionic surfactant (sodium dodecanoate, SDD or sodium dodecyl sulfate, SDS) or nonionic surfactant (Pluronic F-127 or Pl), a well-known polymer used as a stabilizer or thickener (carboxymethyl cellulose, CMC or hydroxyethylcellulose, HEC) and a defoaming agent (lignosulfonic acid sodium salt or LAS). Enhancement solutions containing the specified or other surfactant(s) and/or polymer(s) have long been utilized or suggested for stabilizing suspensions for different applications. − The effectiveness of 5 different enhancement solution combinations on the stability of the adsorbent suspensions was investigated: A. CMC + SDD + LAS; B. HEC + SDD + LAS; C. CMC + SDS + LAS; D. HEC + SDS + LAS; and E. CMC + Pl + LAS, respectively. A control sample, that is, the adsorbent suspension without the enhancement solution, was also prepared.…”

Nd(III) sorption using aminophosphonate-based sorbents – Sorption properties and application to the treatment of REE concentrate

“…Two materials show outstanding performances for neodymium removal from aqueous solutions: (a) with graphene oxide/carboxymethyl cellulose, q m,exp. is up to 4.58 mmol Nd g − 1 at pH 3 [90] (with low affinity coefficient), and (b) around 3.54 mmol Nd g − 1 at pH 5 with magnetic glutamine-derivative of polyacrylonitrile/divinyl benzene sorbent [91]. Though the textural properties of the graphene oxide derivative have not been characterized [90], it is well known that exfoliated graphene oxide materials exhibit outstanding specific surface area (typically higher than 2000 m 2 g − 1 , which is probably significantly reduced after grafting CMC); this may contribute to the high levels of sorption together with the high density of carboxylate groups.…”

On membrane-based approaches for rare earths separation and extraction – Recent developments

“…Also, a GO-based adsorbent was applied for adsorption of Nd 3+ and Ce 3+ . In this case GO was modified with sodium carboxy-methyl cellulose applying tetraethyl orthosilicate as a linker [282]. High adsorption capacities i.e., 654 and 431 mg g -1 for Nd 3+ and Ce 3+ were recorded, respectively, being larger than for the observed different clays, GO materials and composites.…”