Sorption of cesium ions from aqueous solutions by multi-walled carbon nanotubes functionalized with copper ferrocyanide

Abstract

In this study, copper ferrocyanide-functionalized, multi-walled carbon nanotubes (MWCNT-CuFCs) were synthesized. The MWCNT-CuFCs exhibited a high capacity for sorbing Cs ? from aqueous solutions because of their strong affinity for Cs ? and high specific surface area. The sorption capacity of the MWCNT-CuFCs for Cs ? was dependent upon the initial pH of the solution. The sorption ability of the MWCNT-CuFCs for Cs ? was maintained even in the presence of co-existing ions (K ? and Na ? ). To determine the degree of Cs ? desorption from the MWCNT-CuFCs, a column-based desorption experiment was performed.

Towards the Extraction of Radioactive Cesium-137 from Water via Graphene/CNT and Nanostructured Prussian Blue Hybrid Nanocomposites: A Review

“…Chitosan was wrapped around the CNT to increase their dispersion and also to link them to the PB analogs. Two studies have combined CNT with Cu cyanoferrates linked via different amine groups i.e., propargylamine (Figure 7) and dietheleneamine on SWCNT [74] and MWCNT [75], respectively. The Q max increased from 150 mg/g (MWCNT) to 239 mg/g (SWCNT).…”

“…In the Tempkin model it is assumed that the adsorption energy reduces as and when the sites become saturated [71,77]. The Brunauer-Emmet-Teller model assumes multilayer adsorption by considering the Langmuir model for each adsorbed layer [75]. Figure 9 provides examples of some of the isotherm models used in CNT/graphene-PB nanocomposites surveyed in this work.…”

Copper hexacyanoferrate functionalized single-walled carbon nanotubes for selective cesium extraction

“…Above 600°C, SWCNTs_PRG shows the same weight loss than pristine SWCNTs. However, a supplemental weight loss is observed in the case of SWCNTs_CuHCF on a large temperature range, which could be related to the thermal degradation of the organic (C) and inorganic (Cu, Fe, K and N) moieties found in CuHCF nanoparticles [11]. Considering that the amount of PRG molecules and CuHCF-NPs grafted on carbon nanotubes is calculated based on the differential weight loss with regards to pristine SWCNTs, the PRG functionalization rate is estimated to 12wt.…”

“…In order to further improve the performance of these materials for ionic sorption, it is interesting to use the known and mastered chemistry of carbon nanotubes (CNTs) in order to functionalize them with molecules or nanoparticles able to specifically capture the targeted ions. Some works have been carried out in this view using MWCNTs as support for CuHCF-NPs [10][11], and a Cs + sorption capacity of about 150 mg.g -1 was found for this substrate. Provided that SWCNTs possess a higher specific surface area than MWCNTs, they can be considered as a promising solid support for functionalization with molecules able to capture cations.…”

Rapid enrichment of cesium ions in aqueous solution by copper ferrocyanide powder

“…Here, copper ferrocyanide powder was synthesized by coprecipitation. The prepared CuFC powder was used as an adsorbent to adsorb Cs + ions in radioactive wastewater, by batch sorption technique to assess the adsorbability of CuFC from radioactive wastewater [29][30][31][32]. The sorbent was characterized by X-ray diffractometry XRD, infrared spectroscopy FT-IR, scanning electronmicroscope (SEM), energy dispersive spectrometer (EDS) and thermogravimetric analysis (TGA).…”