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Cross-Linked and Functionalized Acrylic Polymers: Efficient and Reusable Sorbents for Zn(II) Ions in Solution
Journal of Polymers and the Environment ( IF 5.3 ) Pub Date : 2021-01-18 , DOI: 10.1007/s10924-020-02005-1
C. Mita , I. Bunea , T. Roman , D. Humelnicu

The efficiency of the three types of cross-linked and functionalized with triethylenetetramine (As30 and As32) and acylate diethylenediamine (Cm26) acrylic polymers towards zinc ions from synthetic wastewaters has been investigated under different experimental conditions. The sorption and reusability of metal ions on three types of polymer were studied by the static and dynamic method. The effects of contact time, the initial metal ion concentration, pH, sorbent mass and temperature on the adsorption capacity of the three types of cross-linked and functionalized acrylic polymers were investigated. The thermodynamic parameters associated with the adsorption process were evaluated, and obtained values suggested an exothermic process. The experimental data confirm much better to the Langmuir isotherm than the Freundlich, Temkin, Dubinin–Radushkevich, Sips and Flory–Huggins isotherms. The obtained values for the separation factor, RL were less than 1 one which shows that the adsorption process was favorable. The obtained results indicated that the Cm26 has a higher sorption capacity (1135.77 43 mg g−1) towards zinc ions than As32 (1059.47 43 mg g−1) and As 30 (857.77 43 mg g−1) at 293 K. The adsorption capacity sorbents towards Zn2+ ions after five consecutive sorption/desorption cycles, with 0.1 M Na2CO3 aqueous solution as eluent, decreased with about 5% of the initial sorption capacity and this fact recommended the potential of these functionalized polymers in the removal of Zn(II) ions from residual waters.



中文翻译:

交联和功能化的丙烯酸聚合物:溶液中Zn(II)离子的高效可重复使用的吸收剂

在不同的实验条件下,研究了三种类型的三亚乙基四胺(As30和As32)和酰化二亚乙基二胺(Cm26)丙烯酸聚合物交联和官能化对合成废水中锌离子的效率。通过静态和动态方法研究了金属离子在三种聚合物上的吸附和可再利用性。研究了接触时间,初始金属离子浓度,pH,吸附剂质量和温度对三种类型的交联和官能化丙烯酸聚合物的吸附容量的影响。评估了与吸附过程相关的热力学参数,获得的值表明存在放热过程。实验数据证实,朗格缪尔等温线要好于Freundlich,Temkin,Dubinin–Radushkevich,Sips和Flory-Huggins等温线。获得的分离系数RL小于1,表明吸附过程是有利的。所获得的结果表明,Cm26在293 K时对As离子(1059.47 43 mg g -1)和As 30(857.77 43 mg g -1)具有更高的对锌离子的吸附能力(1135.77 43 mg g -1)。在经过五个连续的吸附/解吸循环后,以0.1 M Na 2 CO 3水溶液为洗脱剂,对Zn 2+离子的吸附能力下降了,约为初始吸附能力的5%,这一事实建议了这些官能化聚合物在去除中的潜力残留水中的Zn(II)离子。

更新日期:2021-01-19
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