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Comparison of hollow fiber membrane and solvent extraction techniques for extraction of cerium and preparation of ceria by stripping precipitation
Author(s) -
Rout Pradeep C.,
Sarangi Kadambini
Publication year - 2015
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4426
Subject(s) - cerium , stripping (fiber) , extraction (chemistry) , chemistry , aqueous solution , hollow fiber membrane , metal ions in aqueous solution , solvent , precipitation , inorganic chemistry , membrane , nuclear chemistry , metal , chromatography , materials science , biochemistry , physics , organic chemistry , meteorology , composite material
BACKGROUND The extraction of cerium by hollow fiber supported liquid membrane using tri‐octyl methyl ammonium chloride ( TOMAC ) as mobile carrier was studied and the result was compared with solvent extraction data. The effect of different parameters such as pH , flow rates, extractant concentration, metal ion concentration and strip solution concentration on cerium extraction was investigated . RESULTS These parameters were optimized for maximum cerium flux and were found to be: pH 1.0, 0.1 mol L −1 TOMAC , 290 mL min −1 feed solution flow rate, 150 mL min −1 strip solution flow rate and 0.9 mol L −1 H 2 SO 4 as strip solution. The parameters were also optimized for solvent extraction study. The number of stages and Aqueous:Organic (A:O) ratio for extraction and stripping were determined from McCabe –Thiele diagrams. The extracted species was determined to be ( R 3 NCH 3 ) 2 Ce ( SO 4 ) 3 . The selective separation of cerium in presence of various other metal ions such as iron, copper, zinc, cobalt, nickel and manganese using a hollow fiber supported liquid membrane ( HFSLM ) was carried out and the separation factor values were found to be in the order α Ce/Fe < α Ce/Cu < α Ce/Mn < α Ce/Zn < α Ce/Co < α Ce/Ni . Finally highly pure (99.99%) CeO 2 was prepared by stripping precipitation with oxalic acid and thermal decomposition at 900°C for 1 h . CONCLUSION The efficiency of hollow fiber supported liquid membrane was greater than that of solvent extraction for the extraction of cerium for the present system. © 2014 Society of Chemical Industry