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首页> 外文期刊>RSC Advances >Synthesis of a poly(amidoxime-hydroxamic acid) cellulose derivative and its application in heavy metal ion removal
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Synthesis of a poly(amidoxime-hydroxamic acid) cellulose derivative and its application in heavy metal ion removal

机译：聚（ami胺肟-异羟肟酸）纤维素衍生物的合成及其在重金属离子去除中的应用

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Amidoxime and hydroxamic acid functional groups have comparable chelating ability with synthetic resins, but the synthesis of cellulose fibers bearing amidoxime and hydroxamic acid functional groups using simple and effective strategies have yet to be developed. In this study, a poly(amidoxime-hydroxamic acid) cellulose derivative (pAHA-cellulose) was prepared via free radical polymerization followed by an oximation reaction. A series of microscopic analyses and spectral tests proved that the pAHA-cellulose was covered with uniform amidoxime and hydroxamic acid functional groups. The use of pAHA-cellulose towards heavy metal ion removal was investigated and an uptake equilibrium was achieved within 60 min for Cu2+ and Zn2+, and 120 min for Pb2+ and Cr3+, through a chelation mechanism. The adsorption behavior followed the pseudo-second-order kinetic model and Langmuir isotherm with Langmuir maximum adsorption capacities of 395.3, 333.3, 268.8 and 216.9 mg g?1 for Cu2+, Pb2+, Cr3+ and Zn2+, respectively. Regeneration of pAHA-cellulose did not significantly influence the adsorption towards metal ions for up to five sequential cycles. Considering the simple and efficient grafting process, excellent adsorbability and prominent renewability, pAHA-cellulose is believed to be a new and feasible candidate for heavy metal ion removal from aqueous solution.
机译：mid胺肟和异羟肟酸官能团具有与合成树脂相当的螯合能力，但是尚未开发出使用简单有效的策略合成带有bearing胺肟和异羟肟酸官能团的纤维素纤维的方法。在这项研究中，通过自由基聚合，然后进行肟化反应，制备了一种聚（ami胺肟-异羟肟酸）纤维素衍生物（pAHA-纤维素）。一系列的显微镜分析和光谱测试证明，pAHA-纤维素被均匀的a胺肟和异羟肟酸官能团覆盖。研究了pAHA纤维素在重金属离子去除中的应用，并在60分钟内达到了Cu 2 + 和Zn 2+的吸收平衡。 ，Pb 2 + 和Cr 3 + 的120分钟螯合机制。吸附行为遵循拟二级动力学模型和Langmuir等温线，Langmuir最大吸附容量为395.3、333.3、268.8和216.9 mg g ？1 > 2 + ，Pb 2 + ，Cr 3 + 和Zn 2 + 。在最多五个连续循环中，pAHA-纤维素的再生不会显着影响对金属离子的吸附。考虑到简单有效的接枝过程，出色的吸附性和突出的可更新性，pAHA-纤维素被认为是从水溶液中去除重金属离子的新的可行候选人。

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