Preparation of a novel anion exchange group modified hyper-crosslinked resin for the effective adsorption of both tetracycline and humic acid
Preparation of a novel anion exchange group modified hyper-crosslinked resin for the effective adsorption of both tetracycline and humic acid
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新型阴离子交换基团改性超交联树脂的制备，可有效吸附四环素和腐植酸
DOI：
10.1007/s11783-013-0483-6
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发表时间：
2013-06
期刊：
影响因子：
--
通讯作者：
Liuyan Wu
中科院分区：
文献类型：
--
作者：
Chendong Shuang;Mancheng Zhang;Xiaohan Liu;Liuyan Wu
以二乙烯基苯（DVB）和丙烯酸甲酯（MA）为共聚单体，经悬浮聚合、后交联、氨解和烷基化反应制备了一种新型阴离子交换基改性超交联树脂（MENQ）。所得树脂具有较高的比表面积（793.34 m2·g−1）和较大的交换容量（强碱阴离子交换容量，SEC为0.74 mmol·g−1，弱碱阴离子交换容量，WEC为0.45 mmol·g−1）。选择XAD-4作为吸附剂进行比较，考察其对四环素（TC）和腐植酸（HA）的吸附行为。结果表明，MENQ能有效去除TC和HA。XAD-4对TC的吸附性能与MENQ相似，但对HA的吸附性能较差。TC和HA的吸附等温线符合Freundlich模型，表明存在阳离子-π键和π-π相互作用的非均相吸附。吸附TC的最佳溶液条件为pH 5 ~ 6，而对HA的吸附随溶液pH的增加而增强。
A novel hyper-crosslinked resin (MENQ) modified with an anion exchange group was prepared using divinylbenzene (DVB) and methyl acrylate (MA) as comonomers via four steps: suspension polymerization, post-crosslinking, ammonolysis and alkylation reactions. The obtained resin had both a high specific surface area (793.34 m2·g−1) and a large exchange capacity (strong base anion exchange capacity, SEC: 0.74 mmol·g−1, weak base anion exchange capacity, WEC: 0.45 mmol·g−1). XAD-4 was selected as an adsorbent for comparison to investigate the adsorption behavior of tetracycline (TC) and humic acid (HA) onto the adsorbents. The results revealed that MENQ could effectively remove both TC and HA. The adsorption capacity of XAD-4 for TC was similar to that of MENQ, but XAD-4 exhibited poor performance for the adsorption of HA. The adsorption isotherms of TC and HA were well-fitted with the Freundlich model, which indicated the existence of heterogeneous adsorption through cation-π bonding and π-π interactions. The optimal solution condition for the adsorption of TC was at a pH of 5–6, whereas the adsorption of HA was enhanced with increasing pH of the solution.
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