温度和 pH 值响应性纤维素纤维/聚（NIPAM-co-AAc）杂化体作为新型吸附剂用于去除 Pb(II)。
Temperature and pH responsive cellulose filament/poly (NIPAM-co-AAc) hybrids as novel adsorbent towards Pb(II) removal.
机构信息
College of Materials Engineering, Fujian Agriculture and Forestry University, Fuzhou 350002, PR China; Department of Chemical Engineering and Limerick Pulp & Paper Centre, University of New Brunswick, Fredericton E3 B 5A3, Canada.
Department of Chemical Engineering and Limerick Pulp & Paper Centre, University of New Brunswick, Fredericton E3 B 5A3, Canada.
出版信息
Carbohydr Polym. 2018 Sep 1;195:495-504. doi: 10.1016/j.carbpol.2018.04.082. Epub 2018 Apr 22.
A novel thermo- and pH sensitive adsorbent, composed of cellulose filament (CF) as the reinforcement scaffold and crosslinked copolymer of, N-isopropylacrylamide (NIPAM) as the thermosensitive component and acrylic acid (AAc) as the pH sensitive component was prepared. SEM images indicated the formation of semi-interpenetrating network between CF and poly(NIPAM-co-AAc). FTIR spectra displayed the characteristic peaks for CF and poly(NIPAM-co-AAc). DSC reflected the lower critical solution temperature derived from PNIPAM in the hybrids. The swelling ratios exhibited dependence on temperature and pH. The adsorption of Pb(II) on CF/poly(NIPAM-co-AAc) reflected pH-dependence. The adsorption kinetics followed a pseudo-second-order model. At 293 K, the maximum adsorption capacity of CF/poly(NIPAM-co-AAc) was 80.8 mg/g, higher than that of CF (45.6 mg/g) as reflected by kinetics curves. Furthermore, with temperature variation, stepwise adsorption-and-halt behavior was observed at pH 6.0, while swing desorption behavior could be observed at approximately pH 3.0.
一种新型的温敏和 pH 敏感吸附剂，由纤维素长丝（CF）作为增强支架和交联共聚物 N-异丙基丙烯酰胺（NIPAM）作为温敏成分和丙烯酸（AAc）作为 pH 敏感成分组成。SEM 图像表明 CF 和聚（NIPAM-co-AAc）之间形成了半互穿网络。FTIR 光谱显示了 CF 和聚（NIPAM-co-AAc）的特征峰。DSC 反映了混合物中源自 PNIPAM 的较低临界溶液温度。溶胀率表现出对温度和 pH 的依赖性。Pb(II)在 CF/poly(NIPAM-co-AAc)上的吸附表现出 pH 依赖性。吸附动力学遵循拟二级模型。在 293 K 下，CF/poly(NIPAM-co-AAc)的最大吸附容量为 80.8 mg/g，高于动力学曲线反映的 CF（45.6 mg/g）的吸附容量。此外，随着温度的变化，在 pH 6.0 时观察到逐步吸附-暂停行为，而在大约 pH 3.0 时观察到摆动解吸行为。
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