การกำจัดไอออนของแคดเมียม โครเมียม ตะกั่ว และนิกเกิล จากสารละลาย ด้วยเรซินที่เตรียมจากเปลือกถั่วเหลือง / วิษา สอนใจ = Removal of cadmium chromium lead and nickel ions from aqueous solution using resin prepared from soybean hulls / Wisa Sornjai
This research investigates the efficiency of ino-exchang resin prepared from soybean hulls for removal of Cadmium, Lead and Nickel ions from aqueous solution. Scope of this research included the study of the optimum method for preparing soybean hulls with and without chemical modification by using citric acid and sodium sulphite, as well as the optimum condition for removal of heavy metals using resin prepared from soybean hulls. The experiments were carried out by batch out by batch process. The result indicated that the optimum method for preparing soybean hulls before chemical modification was attained by treating with 0.1 M NaOH, the optimum condition for chemical modified soybean hulls was achieved by using 0.6M citric acid for 90 minutes at 80C and using 0.9 M sodium sulphite for 2 hours at 70C. The further study showed that the optimum condition, for removal of heavy metals at the concentration of 5 milligrams per liter using 1 gram of adsorbent, was contact time 1 hour at pH 4-6 for Cadmium Nickel and Lead, and contact time 1 hour at pH 4 ofr Chromium. The efficiency for removal of Cadmium, Chromium, Nickel and Lead ions was 96.94, 87.80, 90.80 and 99,06 percent for citric acid-treated resin. Similarly, 97.90, 90.60, 93.24 and 99.44 percent of Cadmium, Chromium, Nickel and Lead could be removed by sodium sulphitetreated resin.