乙萘酚和甲萘胺在超高交联树脂上的竞争吸附

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通过氯甲基化的苯乙烯-二乙烯苯共聚物的后交联反应制备了超高交联吸附树脂(NDA150),通过红外光谱和比表面孔径分析对NDA150和XAD-4树脂的结构和表面参数进行表征。通过等温吸附实验研究了水溶液中乙萘酚和甲萘胺在NDA150和XAD-4上的竞争吸附行为。结果表明,NDA150树脂具有较高的比表面积为1 144 m2/g和较丰富的微孔,而XAD-4树脂的比表面积为904 m2/g,且以中孔为主。通过等温线吸附实验可知,在单组分水体系中NDA150和XAD-4树脂对乙萘酚和甲萘胺都具有较好的吸附性能,303 K时,NDA150和XAD-4对乙萘酚的吸附量分别可达1.97和1.24mmol/g;对甲萘胺的吸附量分别为2.33和1.45 mmol/g;吸附质在树脂上的吸附等温线符合Langmuir模型。在双组分水体系中乙萘酚和甲萘胺的物质的量之比为1∶1(C0=2.0 mmol/L),树脂对两种吸附质的吸附量均减少,但是树脂对吸附剂的吸附总量大于相同平衡浓度下对单组分水溶液中乙萘酚和甲萘胺的吸附量。在303 K时,建立LCA模型来预测吸附质的竞争吸附,并对模型进行修正,用LCA修正模型的拟合效果较好。 The ultra-high crosslinked resin (NDA150) was prepared by post-crosslinking of chloromethylated styrene-divinylbenzene copolymer. The structure and surface of NDA150 and XAD-4 resin were characterized by FTIR and specific surface area analysis Parameters for characterization. The isothermal adsorption experiments were carried out to study the competitive adsorption of ethylnaphthol and nadronamide on NDA150 and XAD-4 in aqueous solution. The results showed that the NDA150 resin has a high specific surface area of ​​1 144 m2 / g and abundant micropores, while the XAD-4 resin has a specific surface area of ​​904 m2 / g and mainly mesopores. By isothermal adsorption experiments we can see, NDA150 and XAD-4 resin in the single-component water system has good adsorption properties on the naphthol and melamine, 303DA, NDA150 and XAD-4 on the naphthol The adsorption capacities of the adsorbents were 1.97 and 1.24 mmol / g, respectively. The adsorption amounts of p-methylnadine for the two naphthalenes were 2.33 and 1.45 mmol / g, respectively. The adsorption isotherms of the adsorbents conformed to the Langmuir model. In the two-component water system, the ratio of the amount of the naphthol to the naphthylamines was 1: 1 (C0 = 2.0 mmol / L), and the adsorption capacity of the resin to both adsorbents decreased. However, The total adsorption is greater than the same equilibrium concentration of the single-component aqueous solution of B naphthol and naphthylamine adsorption capacity. At 303 K, the LCA model was established to predict the competitive adsorption of adsorbate, and the model was modified. The fitting effect of LCA model was better.
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