壳聚糖改性材料用于海水提铀研究

Study on uranium extraction from seawater with chitosan modified materials

摘要:

通过在壳聚糖上交联偕胺肟基(AO)和1-二甲胺基烯丙基膦酸(DMAAPA)，制备出一种可用于海水提铀的新型壳聚糖改性材料(CTS-AM-AO-DA)，使用FT-IR光谱和扫描电镜表征材料表面的官能团和形貌．通过吸附实验研究了材料在模拟海水中的吸附动力学过程和溶液pH、盐分以及竞争离子对材料吸附性能的影响．CTS-AM-AO-DA在模拟海水中的平衡吸附容量达到223.0 mg/g，吸附过程符合准二级动力学方程．在高pH(8.0)、高盐分(0.5 mol/L NaCl)、存在竞争离子(钙、镁、钒)的条件下，CTS-AM-AO-DA均表现出优异的铀吸附性能，该材料在海水提铀领域具有潜在的应用价值．

Abstract:

A novel chitosan modified material, CTS-AM-AO-DA was synthesized through the crosslinking of chitosan with amidoxime group and (1-(dimethylamino)allyl) phosphonic acid (DMAAPA) as the uranium adsorbent from seawater. The chemical structures and appearance of the polymers were characterized by the FT-IR spectrum and the SEM. The adsorption kinetics in simulated seawater and the effects of solution pH, salinity, and competing ions on the adsorption properties of materials were studied by using adsorption experiments. The equilibrium adsorption capacity of CTS-AM-AO-DA is 223 mg/g and the adsorption dynamic data are applicable to the quasi-second-order model. Weak alkalinity (8.0), high salinity (0.5 mol/L) or the presence of competitive ions (Ca2+, Mg2+, V5+) can not affect the adsorption properties of this material (CTS-AM-AO-DA) that provides the potential applications in real seawater environment.