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首页> 外文会议>Fifth International Conference on Ion Exchange Processes held on 5-9 July 1998 at Plas Coch College, The North East Wales Institute, Wrexham, UK >Temperature dependence of the selectivity of an iminodiacetic resin towarod transition metal ions
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Temperature dependence of the selectivity of an iminodiacetic resin towarod transition metal ions

机译：亚氨基二乙酸树脂对warod过渡金属离子的选择性与温度的关系

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摘要

Removal of heavy metal ions from industrial effluents and wastewaters by ion exchange~(1-3) (IX) has some advantages over other separation methods, such as precipitation or biological processes, because IX allows, not only for the elimination of metals from these effluents, but, also for their recovery directly contributing to resource conservation.~(4,5) The main limitation of IX is the generation of chemical wastes produced during conditioning and regeneration steps. This limitation can be overcome by applying reagent-less (and waste-free, as a result) IX technologies such as parametric pumping ~(6-9), dual-temperature IX processes~(10) and thermal IX fractionation~(11,12) which exploit the influence of temperature on the affinity of ion exchangers towards certain ions. Chelating rsins, which are known to be highly selective towards heavy metal ions, have found little use in studles on temperature-resonsive IX separation processes, although they meet the main requirement for their application in dual-temperature IX separation: a high heat of IX reaction.~(8, 13-16) The present study was undertaken 1) to confirm a previously developed approach~(17,18) which allows for the prediction of temperature dependencies of IX equilibrium on chelating resins and which can be applied for the selection of chelating resins suitable for separation of certain ion mixtures by applying temperature-responsive IX fractionation techniques and also for the preselection of ligands with promising characteristics for use in the synthesis of new chelating resins with temperatureresponsive selectivity and 2) to elucidate the influence of complexation conditions in the resin phase on temperature dependence of the cation-exchange equilibrium.
机译：通过离子交换〜（1-3）（IX）去除工业废水和废水中的重金属离子比其他分离方法（例如沉淀或生物工艺）具有一些优势，因为IX不仅允许从这些方法中去除金属（4,5）IX的主要局限性在于在调节和再生步骤中产生的化学废物的产生。可以通过应用无试剂（因而无浪费）的IX技术（例如参数泵送（6-9），双温IX工艺〜（10）和热IX分馏〜（11， 12）利用温度对离子交换剂对某些离子的亲和力的影响。已知对重金属离子具有高度选择性的螯合树脂，尽管满足了双温度IX分离应用的主要要求：高IX加热，但在螺柱中很少用于温共振IX分离工艺。反应（8，13-16）进行了本研究1）确认了先前开发的方法（17,18），该方法可以预测che平衡对螯合树脂的温度依赖性，并且可以应用于通过应用温度响应性IX分级分离技术选择适合于某些离子混合物分离的螯合树脂，以及用于合成具有温度响应选择性的新型螯合树脂的具有前途特性的配体的预选择； 2）阐明络合的影响树脂相中的条件取决于阳离子交换平衡的温度依赖性。

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