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Environmental Science: Water Research & Technology Vol - 1 Issue - 1

Preparation and characterization of potassium nickel hexacyanoferrate-loaded hydrogel beads for the removal of cesium ions

Content Provider	Royal Society of Chemistry (RSC)
Author	Kumar, Manmohan Dwivedi, Charu Bajaj, Parma N. Pathak, Sanjay K. Tripathi, Subhash C.
Copyright Year	2015
Abstract	A novel synthetic approach has been used to prepare sorbent hydrogel composite beads of potassium nickel hexacyanoferrate (KNiHCF), using PVA and cross-linked alginate as the binding matrix. The characterization study indicates the high hydrophilicity and high surface area of the synthesized beads. The application potential of these beads for removal of cesium ions from low level liquid nuclear waste has been studied in batch mode using a 137Cs radiotracer. The equilibrium sorption and kinetic data are obtained at different initial cesium ion concentrations. These data are analysed using various sorption isotherm and kinetic models. It is observed that the sorption process can be best described by the Langmuir isotherm model, and the monolayer capacity of the beads is determined to be 7 mg per g of the swollen beads, which corresponds to ~64 mg per g of the dry beads. The sorption of cesium ions onto the sorbent beads is found to follow pseudo second-order kinetics over the entire studied concentration range. The ion-exchange mechanism involves the exchange of cesium ions with potassium ions. The mechanism of the sorption process is also investigated using the intraparticle diffusion model and Boyd's plot, and the results indicate that the sorption of cesium ions onto the beads is a complex process, involving both intraparticle diffusion and film diffusion.
Starting Page	153
Ending Page	160
Page Count	8
File Format	HTM / HTML PDF
ISSN	20531400
Volume Number	1
Issue Number	2
Journal	Environmental Science: Water Research & Technology
DOI	10.1039/c4ew00021h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Langmuir Boyd Adsorption Gel Potassium Nickel Alginic acid Extracellular matrix Hydrophile Caesium Radioactive waste Caesium-137 Radioactive tracer Sorption Ion Langmuir adsorption model Diffusion
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Water Science and Technology

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