摘要
利用成本低廉、来源广泛的可再生资源——酸析木质素作为主要原料,通过两步反应法:1)Mannich反应引入弱碱性基团,2)O-烷基化反应引入强碱性基团,制备出同时具有强碱性、弱碱性的木质素基吸附材料。采用红外光谱、元素分析对产物进行表征,结果表明,在木质素分子结构上成功引入了胺基基团;并且通过静态吸附试验,测试了该吸附剂在低浓度含铀溶液中的吸附效果。试验结果表明,当溶液的pH值为2.0,铀质量浓度为6 mg/L,吸附剂的用量为10 g/L时,溶液中铀的去除率可以达到93%以上。
The modified lignin-based adsorbent containing the strong-base and weak-base group, was prepared by two-step chemical modification of acid-precipitation lignin, which is a low-cost and abundant renewable natural polymer： 1） weak-base group introduced by Mannich reaction; 2） strong base group introduced by O-alkylation reaction. The adsorbent was characterized by Fourier transform infrared spectroscopy （FT-IR） and elementary analysis（EA）, which demonstrated amino group was successfully introduced into the lignin. In order to assess the adsorption effect, the uranium adsorption experiments of lignin-based adsorbent were carried out in the static mode at room temperature. The removal rate of uranium from the wastewater could reach 93 % under such conditions as pH value 2, uranium concentration 6 mg/L, adsorbent dosage 10 g/L etc.
出处
《铀矿冶》
CAS
2011年第1期32-35,共4页
Uranium Mining and Metallurgy
关键词
酸析木质素
吸附剂
改性
铀
acid-precipitation lignin
adsorbent
modification
uranium
