线性交替聚(4,4'-二苯酚草酸盐)低聚物去除水溶液中的Pb(II)、Zn(II),Sn(II)和Cu(II)离子

IF 0.4 Q4 CHEMISTRY, MULTIDISCIPLINARY Jordan Journal of Chemistry Pub Date : 2020-08-01 DOI:10.47014/15.2.3
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引用次数: 0

摘要

合成了聚(4,4′-双酚草酸酯)低聚物,并用FT-IR、元素分析、XRD和热分析对其进行了表征。该低聚物从水溶液中带走Pb(II)、Zn(II)、Sn(II)和Cu(II)金属离子的能力通过已知的批处理和柱处理技术在浓度、pH值、接触时间和温度方面进行了考察。结果表明:低聚物对金属离子的初始吸收速率在前30分钟内都很高,随着pH值的升高,低聚物对金属离子的吸收速率略有增大,在Pb(II)和Zn(II)的pH=5.00、Cu(II)的pH=4.00和Sn(II)的pH=6.00时达到最大。该低聚物对Pb(II)和Zn(II)具有较高的金属离子吸收能力,对Cu(II)和Sn(II)的金属离子吸收能力较弱。采用Langmuir、Freundlich和Dubinin-Radushkevich吸附等温线的线性化形式研究了Pb(II)、Zn(II)、Cu(II)和Sn(II)的实验平衡浓度数据。ΔG值表明这些金属离子在低聚物上的吸附过程是有利的,而ΔH值表明这一过程是吸热的。另一方面,这个过程的熵是正的。除批量实验外,还进行了柱状实验,用1.0 M HNO3、1.0 M HCl和0.5 M EDTA处理负载金属的低聚物,有效地回收了金属离子。以1.0 M的HNO3溶液效果最好。
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Removal of Pb(II), Zn(II), Sn(II) and Cu(II) Ions from Aqueous Solutions by Linear Alternating Poly(4,4'-biphenol oxalate) Oligomer
Poly(4,4′-biphenol oxalate) oligomer was synthesized and characterized by FT-IR, elemental analysis XRD and thermal analysis. The capability of the oligomer to take away Pb(II), Zn(II), Sn(II) and Cu(II) metal ions from aqueous solutions was considered by the known batch and column techniques in terms of concentration, pH value, contact time and temperature. The results indicated that a high initial rate of metal-ion uptake by the oligomer was observed throughout the first 30 minutes, which enlarged slightly amid rising the pH value and then reached its greatest value at pH=5.00 for Pb(II) and Zn(II), pH=4.00 for Cu(II) and pH=6.00 for Sn(II). The oligomer exhibited a high metal-ion uptake capacity to Pb(II) and Zn(II), but a little metal-ion uptake capacity to Cu(II) and Sn(II). Linearized forms of the Langmuir, Freundlich and Dubinin–Radushkevich adsorption isotherms were used to investigate the experimental equilibrium concentration data of Pb(II), Zn(II), Cu(II) and Sn(II). ΔG values demonstrated that the adsorption process of these metal ions on the oligomer is favored while the ΔH values indicated that this process is endothermic. On the other hand, the entropy of the process is positive. In addition to batch experiments, column experiments were performed, where the metal ions were efficiently recovered by treatment of the metal-loaded oligomer with 1.0 M HNO3, 1.0 M HCl and 0.5 M EDTA. The best results were obtained with 1.0 M HNO3 solution.
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来源期刊
Jordan Journal of Chemistry
Jordan Journal of Chemistry CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
0.50
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发文量
7
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