Submitted to: Annual Meeting and Expo of the American Oil Chemists' Society
Publication Type: Abstract Only
Publication Acceptance Date: May 16, 2001
Publication Date: N/A
Technical Abstract: During the last years, increasing attention has been paid to polymers obtained from renewable resources. This interest is justified by the environmental advantage of these materials, which are neutral in carbon dioxide cycle and often biodegradable. These polymers may also constitute a new outlet for vegetable products. Among products from agricultural resources, natural oils may constitute raw materials useful in polymer synthesis. United States agriculture produces over 12 billion pounds of soybean oil annually, and frequently carry-over exceeds one billion pounds. Development of economically feasible new industrial products from soybean oil or commercial processes is highly desirable. Epoxidized soybean oil is mainly used as additives in thermoplastics to improve stability and flexibility. Some recent studies investigated the polymers obtained from epoxidized soybean oil as matrices for composites. In this investigation, ion-exchange resins containing carboxylic acid groups were prepared by reaction of epoxidized soybean oil with triethylenetetramine, followed by hydrolysis using sodium hydroxide solution. The cation exchange capacity of the resins was determined to be 3.50 meq/g. The adsorption capacity for Cu2+, Ni2+ and Co2+ on the obtained resin at pH 5.0 was found to be 192 mg/g, 96 mg/g and 78 mg/g, respectively. Effect of pH on the adsorption capacity for copper, nickel and cobalt were also studied. Cu2+, Ni2+ and Co2+ were adsorbed at a pH above 3. These metal ions adsorbed on the resin are easily eluted using 1 N HCl solution. The selectivity of the resin for Cu2+ from mixtures containing Cu2+/Co2+/Ni2+ ions was also investigated.