Layer-Structured POSS-Modified Fe-Aminoclay/Carboxymethyl Cellulose Composite as a Superior Adsorbent for the Removal of Radioactive Cesium and Cationic Dyes

Abstract

In this work, multifunctional Fe-aminoclay (FeAC)/carboxymethyl cellulose (CMC)/ polyhedral oligomeric silsesquioxane (POSS) composite (FeAC/CMC/POSS) with layered structure was successfully synthesized and utilized as adsorbent for the removal of cesium ions (Cs+) and cationic dyes methylene blue (MB) and chrysoidine G (CG) from aqueous solutions. The FeAC/CMC/POSS exhibit excellent adsorption capacities for Cs+ ions, MB and CG of 152, 438, and 791 mg g–1, respectively. The adsorption capacities for Cs+ ions, MB and CG are substantially greater than those of many previously reported adsorbents due to (i) the layered morphology of the composite and abundance of amino (−NH2) groups on clay surface and (ii) existence of carboxylate (−COO–) and hydroxyl (−OH–) groups on the CMC backbone, which contribute to the adsorption of large number of Cs+ ions and dye molecules through electrostatic attraction and ion-exchange process. More importantly, the incorporation of POSS increases the interlayer spacing of Fe-aminoclay by intercalation providing room for the encapsulation of Cs+ ions and dye molecules. Owing to its unprecedented adsorption capacity, the devised FeAC/CMC/POSS composite could be a promising organic–inorganic material used to cost-effectively remove the multitude of environmental pollutants.

Recent Developments of Carboxymethyl Cellulose

“…There is no absolute limit on how many types of pollutants can be present in wastewater that has come from multiple industries or other household activities. However, to the best of the author’s knowledge, CMC-based materials have been mainly used thus far for the removal of various organic-inorganic dyes [ 74 , 199 , 200 , 201 ], inorganic ionic pollutants (both anions and cations) [ 202 , 203 , 204 , 205 ], as well as various radioactive species [ 83 , 206 , 207 , 208 ] from polluted waters in different experimental conditions.…”

Flame retardant and mechanism of vinyl ester resin modified by octaphenyl polyhedral oligomeric silsesquioxane

“…Compared with the spectrum of Pure VER, the C1s spectrum of VER‐20OPS (Figure C) is deconvoluted to three peaks with binding energies of 288.0, 285.6, and 284.1 eV, which are attributed to Si─C, C─O, and C═C/C─C groups, respectively. The main peaks of the Si2p spectrum of VER‐20OPS (Figure D) are deconvoluted into four components at 104.6, 103.6, 102.9, and 102.5 eV indicating the existence of Si─C, SiO 2 , Si─O─Si, and Si─O─C, respectively . The narrow scanning spectra O1s, C1s, and Si2p of VER‐20OPS show significant enhancement peak of Si─O─C, Si─C and Si─O─Si caused by the presence of OPS in composites.…”

Preparation of Sn-aminoclay (SnAC)-templated Fe3O4 nanoparticles as an anode material for lithium-ion batteries

“…This is similar to the XPS spectra of the synthetic materials arising from aminoclay previously reported for detection of the presence of the NH 3 + functional groups. [25][26][27][28] In addition, it is seen that the intensity of two peaks was unlike with the sample before annealing process, particularly for NH 3 + peak. It is suggested that SnAC surface was carbonated with the degradation of amino groups, as well as partial removal of hydroxyl group on their surface for deprotonation of NH 3 + groups, compared to the initial sample.…”