A cation-exchange resin was synthesized by esterification of cellulose fibers,with alpha-hydroxy polycarobxylic acids in presence of sodium hypophosphite as an esterification catalyst,followed by curing at high temperature.Factors affecting the reaction such as CA concentration,CA/SHP molar ratio,curing conditions,type of polycarboxylic acid,and type of cellulose stubstrate were studied.Reaction conditions were selected to preare cation-exchange resins having a carboxyl content of 132 ,114,112 meq/100g,respectively.Potentiometric titration of the treated substraes reveals that they are weakcation exchangers having strength values of 5.6,6.3,and 5.8 for cotton,viscose,and jute,respectively.Factors affecting the adsorption of some textile industry pollutants such as a basic dye or cupric cations by the prepared cation exchangers were investigated.The removal percent of these pollutants remarably increases by increasing the pH.
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