新型孢粉螯合树脂中重金属在水溶液中的离子交换平衡

M. Ersoz , E. Pehlivan , H.J. Duncan , S. Yildiz , M. Pehlivan
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引用次数: 31

摘要

在20 ~ 50℃的温度范围内,研究了新型螯合交换剂对Cu(II)、Ni(II)、Zn(II)、Cd(II)和Al(III)等多种重金属离子的吸附作用。以二氯抗氧肟和溴乙酸为原料,制备了具有肟和羧酸侧臂官能团的新型金属配体交换树脂。在pH 6 ~ 10范围内,对所有金属的吸附均显著增加,吸附顺序为:Cu≥Ni >锌比;Cd比;羧基二氨基乙基孢粉(DAEC)和Ni≥Cu >锌比;Cd比;双二氨基乙基-乙氧肟-孢粉(bDAEG)。水介质的pH值对吸附能力有很大影响,除Al(III)外,对金属的吸收率为90%或以上。金属型树脂通过酸提可以完全回收吸附的物质。两种树脂对浓酸和浓碱均表现出较高的稳定性,并保持了对重金属的高吸附能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ion exchange equilibria of heavy metals in aqueous solution on new chelating resins of sporopollenin

Studies have been conducted on the sorption of several heavy metal ions Cu(II), Ni(II), Zn(II), Cd(II) and Al(III) from aqueous solutions on the new chelating exchangers of sporopollenin (Lycopodium clavatum) as a function of pH at several temperatures between 20 and 50°C. The novel metal-ligand exchange resins possessing oxime and carboxylic acid side arm functionality were prepared through the reaction of diaminosporopollenin with dichloroantiglyoxime and bromoacetic acid. The sorption of all metals increased considerably in the range of pH 6–10 and was observed in sequence as: Cu ≥ Ni > Zn > Cd > Al for carboxylated-diaminoethyl-sporopollenin (DAEC) and Ni ≥ Cu > Zn > Cd > Al for bis-diaminoethyl-glyoxime-sporopollenin (bDAEG). The level of pH of the aqueous medium had a large influence on the sorption capacity, and the uptake of metals, except Al(III), was found to be 90% or more. The metal-form resins afforded complete recovery of the sorbed species by acid stripping. Both resins also showed high stability towards concentrated acids and bases and retained their high capacity for heavy metals.

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