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首页> 外文期刊>Journal of Polymers and the Environment >Alternative Reuse of Oligomers Derived from Poly(ethylene terephthalate) Waste Deposited onto Microspheres and Determination of Adsorbent Properties Toward Toxic Metals
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Alternative Reuse of Oligomers Derived from Poly(ethylene terephthalate) Waste Deposited onto Microspheres and Determination of Adsorbent Properties Toward Toxic Metals

机译：衍生自沉积在微球上的聚（乙烯对苯二甲酸乙二醇酯）废物的替代再利用寡聚物和朝向有毒金属的吸附性能

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The aim of this work is to report the alternative reuse of poly(ethylene terephthalate) waste based on the preparation of oligomers by catalyzed glycolysis, their deposition onto the surface of stainless steel metallic hollow microspheres and the determination of adsorbent properties toward lead, nickel and cadmium cations in aqueous solutions. The coated microspheres were characterized by field emission scanning electron microscopy, differential scanning calorimeter and energy-dispersive X-ray spectroscopy. In the case of oligomers, they were also characterized by infrared spectroscopy, gel permeation chromatography and H-1 NMR analyses. The adsorption properties of coated microspheres toward toxic metals showed maximum adsorption capacities of 309.32, 225.35 and 97.72 mg g(-1) for lead, nickel and cadmium cations, respectively; which fitted very well with the Freundlich isotherm model. In a preliminary fixed-bed column study based on the removal of heavy metals by means of the coated microspheres showed that breakthrough curve for the Pb2+ presents the better fitting to the experimental data at times greater than 30 min and predicts the equilibrium at time greater than 160 min. Adsorption/desorption studies demonstrated that coated microspheres could be recovered using 0.05 M EDTA solution with a maximum recovery amount of heavy metals higher than 50%, which making them regenerable and reusable. These results suggest that coated stainless steel metallic hollow microspheres with oligomers obtained from PET waste are a potential system for the removal of heavy metal from contaminated effluents.
机译：本作作品的目的是通过催化的糖溶解，在不锈钢金属中空微球的表面上沉积到铅，镍和铅，镍和铅，镍和镍和氮气表面的沉积到所述烯烷烃表面上的替代物（乙烯对苯二甲酸乙二醇酯）废物的替代再利用。水溶液中的镉阳离子。涂覆的微球的特征在于现场发射扫描电子显微镜，差示扫描量热计和能量分散X射线光谱。在低聚物的情况下，它们的特征在于红外光谱，凝胶渗透色谱和H-1 NMR分析。涂覆的微球对有毒金属的吸附性能分别显示出铅，镍和镉阳离子的最大吸附容量309.32,225.35和97.72mg（-1）;这与Freundlich等温模型很好。在初步固定床柱研究中，通过涂覆的微球去除重金属，显示PB2 +的突破曲线在大于30分钟的时间内呈现给实验数据的更好，并在大于的时间内预测平衡160分钟。吸附/解吸研究表明，可以使用0.05M EDTA溶液回收涂覆的微球，其最大恢复量高于50％，这使得它们可再生和可重复使用。这些结果表明，涂​​覆的不锈钢金属中空微球与宠物废物中获得的低聚物是从受污染的流出物中除去重金属的潜在系统。

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