Resorcinol-formaldehyde coated XAD resin beads for removal of cesium ions from radioactive waste: synthesis, sorption and kinetic studies

RSC Advances ◽  
2012 ◽  
Vol 2 (13) ◽  
pp. 5557 ◽  
Author(s):  
Charu Dwivedi ◽  
Amar Kumar ◽  
Juby K. Ajish ◽  
Krishan Kant Singh ◽  
Manmohan Kumar ◽  
...  
Keyword(s):  
Radioactive Waste ◽  
Kinetic Studies ◽  
Resorcinol Formaldehyde ◽  
Cesium Ions ◽  
Resin Beads ◽  
Xad Resin

Removal of cesium by spherical resorcinol–formaldehyde resin beads: Sorption and kinetic studies

2012 ◽  
Vol 297 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Charu Dwivedi ◽  
Sanjay Kumar Pathak ◽  
Manmohan Kumar ◽  
Subhash Chandra Tripathi ◽  
Parma Nand Bajaj
Keyword(s):  
Kinetic Studies ◽  
Formaldehyde Resin ◽  
Resorcinol Formaldehyde ◽  
Resin Beads

New Technologies for Decontamination of Radioactive Substances Scattered by Nuclear Accident / Nowe Technologie Dekontaminacji Radioaktywnych Substancji Rozproszonych Przez Awarie Nuklearna

2013 ◽  
Vol 58 (1) ◽  
pp. 283-290 ◽  
Author(s):  
Y. Nishizaki ◽  
H. Miyamae ◽  
S. Ichikawa ◽  
K. Izumiya ◽  
T. Takano ◽  
...  
Keyword(s):  
Radioactive Waste ◽  
New Technologies ◽  
Ferric Hydroxide ◽  
Nuclear Accident ◽  
Radioactive Cesium ◽  
Cesium Ions ◽  
Naoh Solution ◽  
High Concentrations ◽  
Water Rinsing

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.

Preparation and evaluation of alginate-assisted spherical resorcinol–formaldehyde resin beads for removal of cesium from alkaline waste

2012 ◽  
Vol 200-202 ◽  
pp. 491-498 ◽  
Author(s):  
Charu Dwivedi ◽  
Amar Kumar ◽  
Kuttan Ajish Juby ◽  
Manmohan Kumar ◽  
Piaray Kishen Wattal ◽  
...  
Keyword(s):  
Formaldehyde Resin ◽  
Resorcinol Formaldehyde ◽  
Resin Beads ◽  
Alkaline Waste ◽  
Preparation And Evaluation

Ultrasonic absorption kinetic studies of the complexation of aqueous potassium and cesium ions by 18-crown-6

1976 ◽  
Vol 98 (22) ◽  
pp. 6905-6908 ◽  
Author(s):  
Gerard W. Liesegang ◽  
Michael M. Farrow ◽  
Neil Purdie ◽  
Edward M. Eyring
Keyword(s):  
Kinetic Studies ◽  
Ultrasonic Absorption ◽  
Cesium Ions ◽  
Absorption Kinetic

A Resorcinol-Formaldehyde Resin as an Embedding Material for Electron Microscopy of Membranes

1969 ◽  
Vol 27 ◽  
pp. 328-329 ◽  
Author(s):  
J. G. Robertson ◽  
D. F. Parsons
Keyword(s):  
Electron Microscopy ◽  
Osmium Tetroxide ◽  
Neutral Lipids ◽  
Lipid Extraction ◽  
Water Soluble ◽  
Formaldehyde Resin ◽  
Electron Microscope Autoradiography ◽  
Resorcinol Formaldehyde ◽  
Major Disadvantage ◽  
Cell Organization

The extraction of lipids from tissues during fixation and embedding for electron microscopy is widely recognized as a source of possible artifact, especially at the membrane level of cell organization. Lipid extraction is also a major disadvantage in electron microscope autoradiography of radioactive lipids, as in studies of the uptake of radioactive fatty acids by intestinal slices. Retention of lipids by fixation with osmium tetroxide is generally limited to glycolipids, phospholipids and highly unsaturated neutral lipids. Saturated neutral lipids and sterols tend to be easily extracted by organic dehydrating reagents prior to embedding. Retention of the more saturated lipids in embedded tissue might be achieved by developing new cross-linking reagents, by the use of highly water soluble embedding materials or by working at very low temperatures.

Flavin radicals, conformational sampling and robust design principles in interprotein electron transfer: the trimethylamine dehydrogenase-electron-transferring flavoprotein complex

2004 ◽  
Vol 71 ◽  
pp. 1-14
Author(s):  
David Leys ◽  
Jaswir Basran ◽  
François Talfournier ◽  
Kamaldeep K. Chohan ◽  
Andrew W. Munro ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Kinetic Studies ◽  
Molecular Assembly ◽  
Conformational Sampling ◽  
Trimethylamine Dehydrogenase ◽  
Key Residues ◽  
Electron Transferring Flavoprotein ◽  
Electron Transfer Complex

TMADH (trimethylamine dehydrogenase) is a complex iron-sulphur flavoprotein that forms a soluble electron-transfer complex with ETF (electron-transferring flavoprotein). The mechanism of electron transfer between TMADH and ETF has been studied using stopped-flow kinetic and mutagenesis methods, and more recently by X-ray crystallography. Potentiometric methods have also been used to identify key residues involved in the stabilization of the flavin radical semiquinone species in ETF. These studies have demonstrated a key role for 'conformational sampling' in the electron-transfer complex, facilitated by two-site contact of ETF with TMADH. Exploration of three-dimensional space in the complex allows the FAD of ETF to find conformations compatible with enhanced electronic coupling with the 4Fe-4S centre of TMADH. This mechanism of electron transfer provides for a more robust and accessible design principle for interprotein electron transfer compared with simpler models that invoke the collision of redox partners followed by electron transfer. The structure of the TMADH-ETF complex confirms the role of key residues in electron transfer and molecular assembly, originally suggested from detailed kinetic studies in wild-type and mutant complexes, and from molecular modelling.

Sign in / Sign up

Export Citation Format

Share Document