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Fabrication of two dual-functionalized covalent organic polymers through heterostructural mixed linkers and their use as cationic dye adsorbents

机译：通过异质结构混合接头制备两种双官能化的共价有机聚合物及其作为阳离子染料吸附剂的用途

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摘要

With the rapid development of industrialization, population growth and long-term droughts, the scarcity of clean water and increasing environmental pollution are becoming critical issues. Porous organic polymer materials have been proposed as good candidates for removing pollutant compounds from water supplies. However, because of their finite synthetic chemical reactions and monotonous building blocks, fabricating covalent organic polymer materials with multiple linkages and various different multi-functional components remains a huge challenge. Herein, two dual-functionalized covalent organic polymers (JLUE-COP-1 and JLUE-COP-2) were prepared through heterostructural mixed linkers via imine and hydrazone linkages based on Schiff base condensation. Possessing the advantages of porosity and -conjugated phenyl rings, as well as functional -CO-NH- and -SO3H building units, the resultant dual-functionalized JLUE-COPs exhibited high capabilities for the removal of the cationic dye methylene blue (MB). Experiments were carried out to investigate the effects of pH, dye concentration, contact time and temperature on the performance of the JLUE-COPs. The kinetics, equilibrium properties, thermodynamics and mechanisms were studied. It was found that the adsorption processes of the two JLUE-COPs both followed the second-order kinetic model and can be described well by the Langmuir model. Notably, the differences in the surface and pore volumes of the two JLUE-COPs lead to differences in the adsorption rate, adsorption efficiency and maximum adsorption capacity. In addition, activation energy values and some thermodynamic parameters such as G, H and S suggest that the adsorption processes of dyes onto the JLUE-COPs are entropy-driven, endothermic and spontaneous. Our work thus paves the way for developing functionalized COPs as a new type of platform for removing cationic dyes from wastewater.
机译：随着产业化的快速发展，人口增长和长期干旱，清洁水的稀缺和环境污染的稀缺性正在成为关键问题。已经提出了多孔有机聚合物材料作为从供水中除去污染物化合物的良好候选物。然而，由于它们有限的合成化学反应和单调的结构块，制造具有多种键合的共价有机聚合物材料和各种不同的多功能组分仍然是一个巨大的挑战。这里，通过亚胺和腙键基于Schiff碱缩合，通过异超结构混合链接剂制备两种双官能化的共价有机聚合物（JLUE-COP-1和JLUE-COP-2）。具有孔隙率和缀合的苯环的优点，以及功能性-CO-NH-和-SO3H构建单元，所得的双官能化JLUE-COPS表现出高能力，用于去除阳离子染料亚甲基蓝（MB）。进行实验，以研究pH，染料浓度，接触时间和温度对JLUE-COPS性能的影响。研究了动力学，均衡性能，热力学和机制。结果发现，两个JLUE-COPS的吸附过程均遵循二阶动力学模型，可以通过Langmuir模型良好描述。值得注意的是，两个JLUE-COPS的表面和孔体积的差异导致吸附速率，吸附效率和最大吸附能力的差异。此外，激活能量值和一些热力学参数如G，H和S，表明染料在JLUE-COPS上的吸附过程是熵驱动的，吸热和自发性。因此，我们的作品为开发功能化警察作为一种新型平台，为从废水中除去阳离子染料来开发功能化警察。

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  • 来源
    《RSC Advances》 |2018年第34期|共10页
  • 作者

    Dong Jun; Xu Feifan; Dong Zhaojun; Zhao Yongsheng; Yan Yan; Jin Hua; Li Yangxue;

  • 作者单位

    Jilin Univ Key Lab Groundwater Resources &

    Environm Minist Educ 2519 Jiefangda Rd Changchun 130021 Jilin Peoples R China;

    Jilin Univ Key Lab Groundwater Resources &

    Environm Minist Educ 2519 Jiefangda Rd Changchun 130021 Jilin Peoples R China;

    Jilin Univ Key Lab Groundwater Resources &

    Environm Minist Educ 2519 Jiefangda Rd Changchun 130021 Jilin Peoples R China;

    Jilin Univ Key Lab Groundwater Resources &

    Environm Minist Educ 2519 Jiefangda Rd Changchun 130021 Jilin Peoples R China;

    Jilin Univ Coll Chem State Key Lab Inorgan Synth &

    Preparat Chem Changchun 130012 Jilin Peoples R China;

    Jilin Univ Key Lab Groundwater Resources &

    Environm Minist Educ 2519 Jiefangda Rd Changchun 130021 Jilin Peoples R China;

    Jilin Univ Key Lab Groundwater Resources &

    Environm Minist Educ 2519 Jiefangda Rd Changchun 130021 Jilin Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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