首页> 外文期刊>Separation and Purification Technology >Selectivity of cyclam modified poly(p-chloromethyl styrene-ethyleneglycol dimethacrylate) microbeads for Cu(II),Ni(II),Co(II) and Zn(II)
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Selectivity of cyclam modified poly(p-chloromethyl styrene-ethyleneglycol dimethacrylate) microbeads for Cu(II),Ni(II),Co(II) and Zn(II)

机译:Cyclam改性的聚对氯甲基苯乙烯-乙二醇二甲基丙烯酸酯微珠对Cu(II),Ni(II),Co(II)和Zn(II)的选择性

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Poly(p-chloromethyl styrene-ethyleneglycol dimethacrylate) polymeric microbeads,poly(p-CMS-EGDMA),with an average size of 186mum were synthesized by the suspension polymerization of p-chloromethyl styrene conducted in an aqueous medium.1,4,8,11-Tetraazacyclotetradecane (cyclam) was reacted with polymer active group under the nitrogen atmosphere for 18 h at 65degC.Fourier transform infrared spectrometer (FT-IR) and elemental analyzer were used to characterize the plain and cyclam modified microbeads.The affinity of the cyclam modified poly(p-CMS-EGDMA) microbeads for some metal ions was examined.The adsorption/desorption behaviour of the modified microbeads from aqueous solution containing different amount of metal ions (0.05-20 mM) at different pH values (2.0-7.0) was studied.The uptake of metal ions onto the modified poly(p-CMS-EGDMA) microbeads from solution containing a single metal ions were found to be 232.1,119.2,132.1,and 116.8 mg g~(-1) polymer for Cu(II),Zn(II),Ni(II),and Co(II),respectively.More than 95% of the adsorbed metal ions were desorbed for 48 h in desorption medium containing 3M HNO_3.Poly(p-CMS-EGDMA) co-polymeric microbeads containing cyclam ligand were found to be suitable for repeated use without noticeable loss of adsorption capacity.The selectivity of metal ions was found in the order of Cu(II) Ni(II) > Zn(II) > Co(II).The recovery of different metal ions in the competitive medium is really high for Cu(II),Co(II),Ni(II),and Zn(II) besides the other metal ions namely Cr(IIl),Pb(II),Cd(II),and Mn(II) at pH 5.0 and also pH 2.0.
机译:通过在水介质中进行对氯甲基苯乙烯的悬浮聚合反应,合成了平均粒径为186μm的聚(p-氯甲基苯乙烯-乙二醇二甲基丙烯酸甲酯)聚合物微珠,聚(p-CMS-EGDMA)。1、4、8在氮气氛下,于65°C下,使11-四氮杂环十四烷(cyclam)与聚合物活性基团反应18 h。使用傅立叶变换红外光谱仪(FT-IR)和元素分析仪表征纯净的和cyclam修饰的微珠。研究了Cyclam修饰的聚(p-CMS-EGDMA)微珠对某些金属离子的影响。在不同pH值(2.0-7.0)下,修饰的微珠在不同量的金属离子(0.05-20 mM)的水溶液中的吸附/解吸行为从含单种金属离子的溶液到改性的聚(p-CMS-EGDMA)微珠上的金属离子吸收量为232.1、119.2、132.1和116.8 mg g〜(-1)聚合物(II),Zn(II),Ni(II)和Co(I I)分别将超过95%的吸附金属离子在含有3M HNO_3的解吸介质中解吸48小时。发现含有Cyclam配体的多聚(p-CMS-EGDMA)共聚物微珠适合重复使用而无需吸附能力明显下降,金属离子的选择性依次为Cu(II) Ni(II)> Zn(II)> Co(II)。在竞争性介质中回收不同金属离子确实是除了pH值较高的其他金属离子Cr(IIl),Pb(II),Cd(II)和Mn(II)外,Cu(II),Co(II),Ni(II)和Zn(II)的含量也很高5.0以及pH 2.0。

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