【摘要】 固化杨梅单宁(IMT)是以胶原纤维为基质,通过醛交联剂将杨梅单宁固化在胶原纤维上所制备的吸附材料。研究了该吸附材料对稀土元素Nd3+的富集性能。实验表明:该吸附材料对Nd3+的吸附平衡量受温度和pH的影响。在293~323 K时,Nd3+的吸附平衡量随温度的升高而增加。pH值对吸附平衡量影响较大,在pH为3.5~5.5范围内,吸附量随pH升高而增加。当pH≥6时,吸附量开始逐渐下降。吸附平衡符合Freundlich方程。研究表明,吸附动力学可用拟二级速度方程来描述,由拟二级速度方程计算所得到的吸附平衡量与实测值的偏差在4%以内,具有很好的一致性。其吸附性能为稀土生产工业废液中稀土金属的回收,微痕量Nd3+的富集和测试,以及单一稀土的绿色分离提供了科学依据。更多还原

【Abstract】 The immobilized myrtan tannins(IMT) based on collagen fiber was prepared through aldehyde cross-linking reaction.The adsorption property to Nd~3+ from rare earth was studied.Experiments show that the adsorption capacity of the novel adsorbent to Nd~3+ is related to pH value and temperature of solution.When temperature is 293～323 K,the adsorption capacity of the novel adsorbents to Nd~3+ increases while the adsorption temperature becomes high.When the adsorption temperature over 323 K,the adsorption capacity decreases greatly.In the adsorption pH value range of 3.5～5.5,the adsorption capacity rises with the increase of pit.The adsorption kinetics data are well fitted by pseudo-second-order rate model,and the equilirium adsorption capacities calculated by pseudo-second-order rate model are nearly as same as the data actually determined with error less than 4%.The adsorption property study presents an new method for recovery and determining the trace Nd~3+ and separating the single rare earth element and receivering the rare metal from the waste water.更多还原