胶原纤维固化杨梅单宁对UO22+的吸附

以胶原纤维为基质，通过交联剂将杨梅单宁固化在胶原纤维上制备吸附材料．实验结果表明，所制备的吸附材料对UO2^2 具有很强的吸附能力，当溶液中UO2^2 的浓度为7．5mmol/L、pH为5．0时，吸附容量达到1．19mmol UO2^2 /g(283．3mgU／g)．UO2^2 在固化杨梅单宁上的吸附平衡符合Freurldlich方程，升高温度，平衡吸附量增大。吸附动力学可用拟二级速度方程来描述，由动力学方程计算得到的平衡吸附量与实测的平衡吸附量基本相同，误差在4％以内．pH值对吸附过程有较大影响，适宜的pH在5-8之间。所制备的吸附材料具有优良的柱动力学特性，床层的有效利用率高；经解吸后的吸附柱其吸附性能基本不变。

COLLAGEN IMMOBILIZED MYRICA RUBRA TANNIN AND ITS ADSORPTION FOR UO22+

Myrica rubra tannin, extracted from myrica rubra bark, was immobilized on collagen fiber through crosslinking reaction. It was found that the immobilized tannin material has excellent adsorption capacity to+22UO. The adsorption capacity at pH 5.0 was 1.19mmol+22UO/g (283.3mgU/g) when the initial concentration of +22UOwas 7.5mmol/L. The adsorption isotherms can be described by Freundlich equation, which showed the fact that the increase of temperature favors the adsorption of +22UO. The adsorption kinetics data was well fitted by pseudo-second- order rate model, and the equilibrium adsorption capacities calculated by pseudo-second-order rate model were nearly as same as the data actually determined with error <4%. The adsorption process was significantly influenced by pH of solution and a higher adsorption capacity was obtained in the range of pH 5.0~8.0. Further studies indicated that this novel adsorbent also has excellent column adsorption kinetics properties, as well as highly effective availability of bed. Meanwhile, no considerable change of column adsorption property was observed after adsorption-desorption cycles.