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Sorption of Hg(II) and Pb(II) Ions on Chitosan-Iron(III) from Aqueous Solutions: Single and Binary Systems

机译：壳聚糖-铁（III）对水溶液中Hg（II）和Pb（II）离子的吸附：单系统和二元系统

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The present work describes the study of mercury Hg(II) and lead Pb(II) removal in single and binary component systems into easily prepared chitosan-iron(III) bio-composite beads. Scanning electron microscopy and energy-dispersive X-ray (SEM-EDX) analysis, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA) and point of zero charge (pHpzc) analysis were carried out. The experimental set covered pH study, single and competitive equilibrium, kinetics, chloride and sulfate effects as well as sorption–desorption cycles. In single systems, the Langmuir nonlinear model fitted the experimental data better than the Freundlich and Sips equations. The sorbent material has more affinity to Hg(II) rather than Pb(II) ions, the maximum sorption capacities were 1.8 mmol·g⁻¹ and 0.56 mmol·g⁻¹ for Hg(II) and Pb(II), respectively. The binary systems data were adjusted with competitive Langmuir isotherm model. The presence of sulfate ions in the multicomponent system [Hg(II)-Pb(II)] had a lesser impact on the sorption efficiency than did chloride ions, however, the presence of chloride ions improves the selectivity towards Hg(II) ions. The bio-based material showed good recovery performance of metal ions along three sorption–desorption cycles.

机译：本工作描述了在单组分和双组分系统中将汞Hg（II）和铅Pb（II）去除成易于制备的壳聚糖-铁（III）生物复合材料珠的研究。进行了扫描电子显微镜和能量色散X射线（SEM-EDX）分析，傅里叶变换红外光谱（FTIR），热重分析（TGA）和零电荷点（pHpzc）分析。实验组包括pH研究，单一和竞争性平衡，动力学，氯化物和硫酸盐作用以及吸附-解吸循环。在单个系统中，Langmuir非线性模型比Freundlich和Sips方程更好地拟合了实验数据。吸附材料对Hg（II）的吸附力强于Pb（II）离子，最大吸附量为1.8 mmol·g ^{-1 和0.56 mmol·g ^{-1 分别表示Hg（II）和Pb（II）。用竞争性Langmuir等温线模型调整了二元系统数据。与氯离子相比，多组分系统[Hg（II）-Pb（II）]中硫酸根离子的存在对吸附效率的影响较小，但是，氯离子的存在改善了对Hg（II）离子的选择性。这种生物基材料在三个吸附-解吸循环中均表现出良好的金属离子回收性能。}}

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期刊名称 Polymers
作者
Byron Lapo; Hary Demey; Jessenia Zapata; Cristhian Romero; Ana María Sastre;
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作者单位

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年(卷),期 2018(10),4
年度 2018
页码 367
总页数 18
原文格式 PDF
正文语种
中图分类分子生物学;
关键词
binary chitosan desorption iron lead mercury salt effects single sorption competition;

机译：二元;壳聚糖;解吸;铁;铅;汞;盐效应;单一;吸附竞争;
入库时间 2022-08-17 12:38:00

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Sorption of Hg(II) and Pb(II) Ions on Chitosan-Iron(III) from Aqueous Solutions: Single and Binary Systems

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