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首页> 外文期刊>Current Applied Polymer Science >Sorption of Rare Earth Metal Ions (La(III), Nd(III) and Er(III)) using Cellulose | Bentham Science
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Sorption of Rare Earth Metal Ions (La(III), Nd(III) and Er(III)) using Cellulose | Bentham Science

机译：纤维素对稀土金属离子（La（III），Nd（III）和Er（III））的吸附|边沁科学

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Background: Rare earth elements, REEs, are used for many high-tech applications; the rarefactionof the resource requires developing methods for their recovery from low-grade sources and theirrecycling from waste materials. Sorption processes, including biosorbents, represent an interestingmethod for their recovery from dilute effluents.Objective: This work investigates the sorption of 3 REEs using a cheap, renewable biosorbents: microcrystallinecellulose (considered as a reference material for on-going research on chemically modifiedmaterials).Methods: Sorption properties are studied considering the effect of pH, the uptake kinetics, the sorptionisotherms, the thermodynamic parameters, the recycling of the material and its reuse for successivesorption/desorption cycles.Results: Metal sorption increases with pH, uptake kinetics are relatively fast with an equilibriumreached within 3-4 hours. The kinetic profiles are well fitted by the pseudo-second order rate equation.Maximum sorption capacity reaches 31-53 mg metal g-1, and the Langmuir equation fits well sorptionisotherms. The reaction is endothermic and spontaneous. Metal ions can be readily desorbed with 0.5 MHNO3 solutions and the sorbent can be recycled for at least 4 cycles of sorption/desorption with limiteddecrease in performance (less than 3 %). FTIR and XRD analyses contribute to the characterization ofthe material and the interpretation of sorption mechanism.Conclusion: Microcrystalline cellulose has low sorption capacities for La(III), Nd(III), and Er(III);however, this renewable resource with high effectiveness in terms of recycling and re-use is a promisingsupport for metal recovery.
机译：背景：稀土元素REE被用于许多高科技应用。资源的稀缺性要求开发方法以从低品位资源中回收资源并从废物中回收资源。吸附过程，包括生物吸附剂，代表了从稀废水中回收的一种有趣的方法。目的：本研究使用廉价的可再生生物吸附剂：微晶纤维素（被视为正在进行的化学改性材料研究的参考材料），研究了3种稀土元素的吸附。方法：在考虑pH值，吸收动力学，吸附等温线，热力学参数，材料的循环利用及其在后续吸附/解吸循环中的再利用的影响下，研究了吸附性能。在3-4小时内达到平衡。动力学曲线通过拟二阶速率方程很好地拟合，最大吸附容量达到31-53 mg金属g-1，Langmuir方程拟合很好的吸附等温线。反应是吸热的和自发的。金属离子可以很容易地用0.5 MHNO3溶液解吸，并且吸附剂可以循环进行至少4个吸附/解吸循环，而性能有限地降低（小于3％）。结论：微晶纤维素对La（III），Nd（III）和Er（III）的吸附能力低;但是，这种可再生资源具有很高的有效性。在回收和再利用方面，是金属回收的有希望的支持。

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