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Synthesis of crosslinked chitosan crown ethers and evaluation of these products as adsorbents for metal ions

机译：交联壳聚糖冠醚的合成及其作为金属离子吸附剂的评估

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Two new crosslinked-crown ethers (CCTS-N=CH-B-15-C-5 and CCTS-N=CH-B-18-C-6) were synthesized by the reaction of crosslinked chitosan (CCTS-NH2) with 4'-formyl benzo-15-crown-5 and 4'-formyl benzo-18-crown-6. Their structures were confirmed with elemental analysis, infrared spectra analysis, solid-state C-13 NMR analysis, X-ray diffraction analysis, and differential scanning calorimetry thermogram analysis. In the infrared spectra of CCTS-N=CH-B-15-C-5 and CCTS-N=CH-B-18-C-6, the characteristic peak of C=N stretch vibration appeared at 1650 cm-l. The X-ray diffraction analysis showed that the peak at 2 theta = 20 degrees decreased greatly in CCTS-N=CH-B-15-C-5 and CCTS-N=CH-B-18-C-6. In the C-13 NMR spectra of CCTS-N=CH-B-15-C-5 and CCTS-N=CH-B-18-C-6, the characteristic peak of aromatic carbon appeared at 128-ppm, the characteristic peak of carbon in the C=N group appeared at 151 ppm. The adsorption and selectivity properties of CCTS-N=CH-B-15-C-5 and CCTS-N=CH-B-18-C-6 for Ag+, Pd2+, Pb2+, Cd2+, and Cr3+ were studied. The experimental results showed that the two crosslinked chitosan-crown ethers have not only good adsorption capacities for Ag+ and Pd2+, but also high selectivity for the adsorption of Ag+ or Pd2+ with the coexistence of Pb2+ and Cr3+. The selectivity coefficients of CCTS-N=CH-B-15-C-5 and CCTS-N=CH-B-18-C-6 were KPd2+/(Pb2+) = 9.9, KAg+/Pb2+ = 9.8, KPd2+/(Cr3+) = infinity KPd2+/(Pb2+) = 11.5, KAg-/Pb2+ = 7.1, KPd2+/Cr3+ = infinity respectively. (C) 1998 John Wiley & Sons, Inc. [References: 17]
机译：通过交联壳聚糖（CCTS-NH2）与4的反应，合成了两种新的交联冠醚（CCTS-N = CH-B-15-C-5和CCTS-N = CH-B-18-C-6） '-甲酰苯并-15-冠-5和4'-甲苯并-18-冠-6。通过元素分析，红外光谱分析，固态C-13 NMR分析，X射线衍射分析和差示扫描量热法热分析图确认了它们的结构。在CCTS-N ＝ CH-B-15-C-5和CCTS-N ＝ CH-B-18-C-6的红外光谱中，C ＝ N拉伸振动的特征峰出现在1650cm-1处。 X射线衍射分析表明，在CCTS-N ＝ CH-B-15-C-5和CCTS-N ＝ CH-B-18-C-6中，在2θ＝ 20度的峰大大降低。在CCTS-N = CH-B-15-C-5和CCTS-N = CH-B-18-C-6的C-13 NMR光谱中，芳族碳的特征峰出现在128-ppm，该特征峰C ＝ N基中的碳的峰值出现在151ppm。研究了CCTS-N = CH-B-15-C-5和CCTS-N = CH-B-18-C-6对Ag +，Pd2 +，Pb2 +，Cd2 +和Cr3 +的吸附和选择性。实验结果表明，两种交联的壳聚糖冠醚不仅具有良好的对Ag +和Pd2 +的吸附能力，而且对Ag +或Pd2 +的吸附选择性高，并且Pb2 +和Cr3 +共存。 CCTS-N = CH-B-15-C-5和CCTS-N = CH-B-18-C-6的选择性系数分别为KPd2 + /（Pb2 +）= 9.9，KAg + / Pb2 + = 9.8，KPd2 + /（Cr3 + ）=无穷大KPd2 + /（Pb2 +）= 11.5，KAg- / Pb2 + = 7.1，KPd2 + / Cr3 + =无穷大。 （C）1998 John Wiley＆Sons，Inc. [参考：17]

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