การพัฒนาพอลีเอทิลีนพอลิเมอร์ที่มีหมู่เอมีดอกซิมเพื่อใช้ ดูดซับยูเรเนียมในน้ำจืด / สงวนศักดิ์ ใฮ้กันยา = Development of polyethylene polymer containing amidoxime group to be used for uranium adsorption in fresh water / Sanguansak Hykunya
Uranium adsorbent was prepared from graft copolymerization using gamma radiation and applied to uranium adsorption in fresh water. The adsorbent was prepared by mixing polyethylene polymer with acrylonitrile (AN) /methacrylic acid (MAA) monomers under low atmospheric pressure and irradiated with gamma radiation. The functional cyano group was subsequently converted into the amidoxime group hydroxylamine hydrochloride (NH2OH.HCl), yielding the amidoxime group on polyethylene sheet (PEAO). The degree of grafting was 144 % at the gamma dose of 40 kGy. However, at 30 kGy, uranium adsorption was highest with the prepared 10 ppm uranyl carbonate solution. The uranium was eluted with the concentration gradient of 0.25, 0.5, 1.0 and 2.0 M hydrochloric acid was found the concentration 2.0 M has a most elution efficiency is 10.44 mg/g adsorbent. The prepared adsorbent, 30 kGy gamma dose, was performance-tested by submerging in the chao phraya and bangpakong river. Tested results revealed that the adsorption efficiency of PEAO was 5.44 and 3.32 mg/g adsorbent respectively at the adsorption time for 2 weeks. The reaction time converting of NH2OH.HCl is effect to percent grafting on the adsorbent. Moreover, the adsorbent can be used uranium adsorption in fresh water.
