以天然皮胶原纤维膜为底物,通过醛类化合物的交联剂作用,将毛杨梅单宁(myrica rubra)固定在皮胶原纤维上,制备出新型的膜吸附材料.系统研究了这种膜吸附材料对水溶液中U(Ⅵ)的吸附特性,结果表明:当温度为303 K、pH 5.0、U(Ⅵ)的初始浓度为263.15 mg/L时,每克固化单宁膜吸附U(Ⅵ)的平衡吸附量为56.83 mg,而且平衡吸附量随着温度的升高进一步增大;pH对吸附容量的影响较大,适宜的pH范围在5.0～8.0;这类膜材料的吸附平衡符合Freundlich方程,静态吸附动力学可以用拟二级速度方程来描述.连续吸附实验表明,当原料液中U(Ⅵ)的浓度为263.15 mg/L、流出液体积为500mL时,单层膜的吸附率可达到90%以上;而用三层膜时,当流出液体积达到1000 mL时也未在流出液中检测到U(Ⅵ).该类膜吸附U(Ⅵ)后用0.1 mol/L的HNO3很容易解吸,而且再生后其吸附容量和性能基本不变.
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