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Removal and recovery of gallium ion from solution by insoluble amphoteric starches
Author(s) -
Chan WuChung
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070501008
Subject(s) - adsorption , chemistry , cationic polymerization , ammonium , inorganic chemistry , endothermic process , amine gas treating , langmuir adsorption model , phosphate , gallium , starch , tertiary amine , nuclear chemistry , polymer chemistry , organic chemistry
The removal and recovery of gallium ion (Ga +3 ) from a solution with the high cross‐linked amphoteric starches containing the phosphate anionic group and the quaternary ammonium or tertiary amine cationic group was investigated. The adsorption capacity of tertiary amine phosphate starch (TAP) and quaternary ammonium phosphate starch (QAP) is 0.54 and 0.48 meq/g, respectively. The adsorption process has been found to be concentration dependent and endothermic, and follows the Langmuir isothermal adsorption. The heat of adsorption (Δ H ) is equal to 7.65 kcal/mol for the QAP and equal to 7.65 kcal/mol for the TAP. The percentage of adsorbed Ga +3 ion decreases when HCl, H 2 SO 4 , NaCl, or Na 2 SO 4 is added to the solution. The Ga +3 ion adsorbed on the adsorbents can be recovered by treating with an NaOH or HCl solution (1 M and 3 M ); the maximum percentage of recovery is about 70% when 1 M NaOH solution is used. © 1993 John Wiley & Sons, Inc.