Search Results

You are looking at 1 - 5 of 5 items for :

  • "Magnetic sorbent" x
  • All content x
Clear All

Abstract  

A magnetic sorbent based on a mixture of magnetic iron and nickel oxides, and specific surface activation by ferrocyanide solution for enhancement of cesium adsorption is described. After equilibration of clay or soil suspension with the magnetic sorbent, the latter can be removed with exchangeable radiocesium and radiostrontium by means of magnetic separation. The distribution coefficients of the order 2·103 l/kg for cesium and 5·103 l/kg for strontium were determined. The efficiency of the sorbent was investigated in a 1% montmorillonite or soil suspension. At a soil:sorbent ratio 1:1–1:6 in the suspension, the fraction of exchangeable radiocesium in soil at a 2 hours contact was diminished from 56–59% to 48–12%, the decontamination factor of both the mobile cesium and strontium is about 3. The multistage process and sorbent recycling need further investigation.

Restricted access

Abstract  

The history of sorption and ion-exchange processes starts with the use of natural materials which properties were discovered coincidentally and ends with the age of polymer and anorganic—or synthetic sorbents specifically made for a particular project. Its objectives are focused on sorption of anthropogenic radionuclides originating from nuclear power plant operations (fission, activation, corrosion products and transuranium elements) on bentonites, zeolites, hydroxyapatites, magnetic sorbent, ferrocyanides, and silica sorbent. Bentonites from Slovak deposits should be used as part of multi-barrier system in deep geological repository for spent nuclear fuel and high level radioactive waste. Zeolites are used as molecular sieves, catalysts, ion-exchangers, sorbents, water softeners, in wastewater treatment, in chemistry industry, buildings. Hydroxyapatite is a suitable sorbent for heavy metals and radionuclides due to its low water solubility, high stability under reducing and oxidizing conditions, high specific surface area and good buffering properties. The leaching wastes from the Sereď hydrometallurgical plant represent a large stock of inexpensive, ready-to-use magnetic sorbent for the decontamination of soil or sediments in their common suspensions, followed by the magnetic separation and sorbent recycling. Insoluble ferrocyanides of nickel are highly selective sorbents for heavy alkali metals ions, and therefore can be used to separate cesium from liquid radioactve waste. Silica sorbents modified with imidazole can be used for the separation of cobalt ions from aqueous solution.

Restricted access

maximum recoveries are achieved when 25 mg of magnetic sorbent was used. When higher amounts of sorbent were used, some of the Fe 3 O 4 @PPy magnetic nanocomposite might be lost during the collection process by the external field within 1 min duration

Open access

, and the clear supernatant was carefully discarded; (5) in order to elute silodosin, 0.25 mL of methanol was gently dropped onto the magnetic sorbents, and then, Fe 3 O 4 –MWCNTs–COOH was separated by the magnetic field; (6) after filtration through a 0

Open access
Acta Chromatographica
Authors: Stefano Dugheri, Giorgio Marrubini, Nicola Mucci, Giovanni Cappelli, Alessandro Bonari, Ilenia Pompilio, Lucia Trevisani, and Giulio Arcangeli

desirable [ 65 ]. An alternative way is the use of magnetic sorbent phases, viz. performing a magnetic SPE (MSPE) [ 3 ]. In DSPE, it is crucial to disaggregate to the maximum extent the sorbent into the sample solution to maximize the area of contact

Open access