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首页> 外文期刊>Journal of Applied Polymer Science >Study on Quaternary Ammonium Modified Tentacle-Type Cellulose Beads and Its Adsorption for Ag (CN)_2~-
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Study on Quaternary Ammonium Modified Tentacle-Type Cellulose Beads and Its Adsorption for Ag (CN)_2~-

机译：季铵修饰的触手型纤维素微珠及其对Ag（CN）_2〜-的吸附性能研究

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摘要

A novel anion exchange resin based on cellulose has been prepared to adsorb Ag (CN)_2~- for the urgent demand of silver and the high toxicity of metal-cyanide complexes. Quaternary ammonium groups were grafted onto cellulose beads as main active sites in tentacle-type through a series of chemical reactions. The substitution degree of each reaction was determined to be about 0.854, 2.125, and 2.899 mmol g~(-1), respectively. The resin exhibited excellent spherical shape with microporous structure by the observation of optical microscopy and scanning electron microscope. Moreover, the adsorption experiments demonstrated the adsorption was fast in alkaline condition. Fitting the data into isotherm and kinetic models gave the conclusion that the adsorption behavior matched better with Langmuir model and pseudo-second-order kinetic in initial time followed pseudo-first-order kinetic model in later phase. The equilibrium adsorption capacity was determined to be 3.016 mmol g~(-1). With the advantages of high capacity, short equilibrium time, and alkaline resistance, the resin would be considered to a top-priority adsorbent for the separation of Ag (CN)_2~-. VC 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40987.
机译：为了满足银的迫切需求和金属氰化物配合物的高毒性，已经制备了一种新型的基于纤维素的阴离子交换树脂来吸附Ag（CN）_2〜-。通过一系列化学反应，季铵基团被接枝到纤维素珠上，成为触手型的主要活性位点。确定每个反应的取代度分别为约0.854、2.125和2.899mmol g·（-1）。通过光学显微镜和扫描电子显微镜的观察，该树脂显示出具有微孔结构的优异的球形。此外，吸附实验表明在碱性条件下吸附很快。将数据拟合为等温线和动力学模型，得出的结论是，吸附行为与Langmuir模型更好地匹配，并且在初始时间与伪二级动力学模型相匹配，而在随后的阶段则与拟一级动力学模型相匹配。平衡吸附容量确定为3.016 mmol g〜（-1）。具有高容量，平衡时间短和耐碱性的优点，该树脂被认为是用于分离Ag（CN）_2〜-的最优先吸附剂。 VC 2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2014，131，40987。

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