Removal of cesium ions from A-type zeolites using sodium tetrakis(4-fluorophenyl)borate and sodium tetraphenylborate

Our effort for decontamination of radioactive cesium scattered widely by nuclear accident in March 2011 in Fukushima, Japan has been described. Radioactive cesium scattered widely in Japan has been accumulating in arc or plasma molten-solidified ash in waste incinerating facilities up to 90,000 Bq/kg of the radioactive waste. Water rinsing of the ash resulted in dissolution of cesium ions together with high concentrations of potassium and sodium ions. Although potassium inhibits the adsorption of cesium on zeolite, we succeeded to precipitate cesium by in-situ formation of ferric ferrocyanide and iron rust in the radioactive filtrate after rinsing of the radioactive ash with water. Because the regulation of no preservation of any kind of cyanide substances, cesium was separated from the precipitate consisting of cesium-captured ferric ferrocyanide and ferric hydroxide in diluted NaOH solution and subsequent filtration gave rise to the potassium-free radioactive filtrate. Cesium was captured by zeolite from the potassium-free radioactive filtrate. The amount of this final radioactive waste of zeolite was significantly lower than that of the arc-molten-solidified ash.

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Zn(II)-selective poly (vinyl chloride) (PVC) membrane electrode based on Schiff base ligand 2-benzoylpyridine semicarbazone as an ionophore

Journal of Polymer Engineering ◽

10.1515/polyeng-2020-0053 ◽

2020 ◽

Vol 40 (10) ◽

pp. 842-847

Author(s):

Shankar Suman ◽

Ram Singh

Keyword(s):

Schiff Base ◽

Detection Limit ◽

Vinyl Chloride ◽

Pvc Membrane ◽

Membrane Electrode ◽

Sodium Tetraphenylborate ◽

Potential Response ◽

Selective Electrode ◽

Poly Vinyl Chloride ◽

Pvc Membrane Electrode

AbstractA new poly (vinyl chloride) (PVC) membrane electrode using 2-benzoylpyridine semicarbazone as membrane carrier with dioctylphthalate as plasticizer and sodium tetraphenylborate (NaTBP) as anion excluder has been fabricated and investigated as Zn(II)-selective electrode. Best potential response is observed for the composition PVC 30%, plasticizer 58%, NaTBP 8% and ionophore 4% (w/w). The sensor showed a linear stable response over a concentration range of 1.0 × 10−2–4.56 × 10−6 M with a detection limit of 2.28 × 10−6 M and a response time <10 s. The electrode can be used for at least six months without any divergence in potential.

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Influence of sorption parameters on cesium-137 removal using modified activated carbon obtained from corchorus olitorius stalks

Radiochimica Acta ◽

10.1515/ract-2020-0012 ◽

2020 ◽

Vol 108 (10) ◽

pp. 799-808

Author(s):

Mostafa M. Hamed ◽

Mahmoud M. S. Ali ◽

Aly A. Helal

Keyword(s):

Natural Waters ◽

Low Cost ◽

Radioactive Cesium ◽

Corchorus Olitorius ◽

Fukushima Accident ◽

Modified Activated Carbon ◽

Cesium Ions ◽

Cesium 137 ◽

Sorption Parameters ◽

Surface And Groundwater

AbstractRemoval of 137Cs radionuclides from the environment has engrossed the concern of researchers after Fukushima accident. The leakage of radioactive cesium ions can lead up to surface and groundwater contamination, and this leads to pollution of drinking water sources. In this work, corchorus olitorius stalks has been used as a novel precursor for production of low-cost mesoporous activated carbon (Meso-AC) and HNO3/H2O2-modified Meso-AC (m-Meso-AC). The physicochemical properties of all adsorbents were evaluated. The influences of sorption parameters and presence of some ligands (humic acid, fulvic acid, and EDTA) on the sorption of 137Cs were studied. The maximum 137Cs capacity of m-Meso-AC was found to be 58.74 mg/g. Efficiency of the new adsorbent to remove 137Cs radionuclides from natural waters (tap, river, and groundwater) was investigated. The studies showed that new adsorbent could be used as promising material for the retention of 137Cs from real radioactive waste and natural water samples.

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