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Graphene Oxide Caged Biopolymer Nanocomposite for Purification of Rare Earth Elements from High Grade Egyptian Monazite Concentrate

机译:石墨烯氧化物笼的生物聚合物纳米复合物用于纯化高级埃及单济岩浓缩物的稀土元素

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摘要

Rare earth elements (REEs) play a critical role in the applications of advanced materials. In this respect, an eco-friendly calcium/alginate-graphene oxide (Ca/Alg-GO) nanocomposite was prepared for the removal of Th(IV), U(VI) and Fe(III) from rare earth chloride (RECL3) liquor. The high specific surface area and large numbers of oxygen-containing functional groups of GO and alginate make them suitable for the separation of different metal ions. Results obtained from this work showed that the adsorption process was pH dependent where at pH 2.0 selective removal of Th(IV), U(VI) and Fe(III) was achieved with no separation for REEs. Maximum adsorption capacities for Th(IV), U(VI) and Fe(III) using Ca/Alg-GO nanocomposite reached 418.0 mg g(-1), 129.0 mg g(-1), and 139.0 mg g(-1); respectively. Equilibrium isotherm data were best described by Langmuir model exhibiting R-2 value of 0.92, 0.96 and 1.00 for Th(IV), U(VI) and Fe(III); respectively. In order to produce impurities-free RECL3 liquor, three consecutive cycles were required to completely remove Th(IV), U(VI) and Fe(III) from the said liquor.
机译:稀土元素(REES)在先进材料的应用中发挥着关键作用。在这方面,制备了一种生态友好型钙/藻酸盐 - 石墨烯(CA / ALG-GO)纳米复合物用于从稀土氯化物(RECL3)液中除去(IV),U(VI)和Fe(III) 。高比表面积和大量的去和藻酸盐使其适用于不同金属离子的分离。从该工作获得的结果表明,吸附过程是pH依赖于pH 2.0选择性除去Th(IV)的选择,u(VI)和Fe(III),没有分离REES。使用Ca / Alg-Go纳米复合材料的TH(IV),U(VI)和Fe(III)的最大吸附容量达到418.0mg g(-1),129.0mg g(-1)和139.0mg g(-1) ;分别。 Langmuir模型最佳地描述了平衡等温数据,其rangmuir模型表现出R-2值为0.92,0.96和1.00,U(VI)和Fe(III);分别。为了产生无杂质的RECL3液,需要三个连续的循环来从所述液体中完全除去(IV),U(VI)和Fe(III)。

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