离子型共价有机框架材料的制备及其对染料的吸附性能研究

Preparation of Ionic Covalent Organic Framework Materials and Their Adsorption Properties for Dyes

茜素红(Alizarin Red S)具有毒性高、结构复杂以及化学需氧量(COD)大的特点,是水中难处理的污染物之一。本文采用三醛基间苯三酚和溴化乙锭作为构筑单元,在溶剂热条件下合成一种二维离子型共价有机框架材料TpEB-COF,并通过X射线衍射、扫描电镜和能量色散谱等对其进行结构表征。将制备的TpEB-COF作为固体吸附剂应用对水中茜素红的吸附,考察了吸附时间和pH对吸附过程的影响。结果表明,TpEB-COF对于茜素红的吸附符合准二级动力学方程和Langmuir吸附模型,吸附效率为82.8%,最大吸附量为828mg/g。本研究可为COFs材料的设计和合成提供参考,拓展了离子型COFs材料的应用范围。

Alizarin Red S(ARS)has the characteristics of high toxicity,complex structure,and large chemical oxygen demand(COD)value,making it one of the difficult pollutants to deal with in water.Therefore,a twodimensional ionic covalent organic framework material TpEB-COF was synthesized by using trialaldehyde phloroglucinol and ethidium bromide as building units under solvothermal conditions and characterized by XRD,SEM and EDS.The prepared TpEB-COF was used as a solid adsorbent to adsorb ARS in water.The effects of adsorption times and pH on the adsorption process were studied.The results showed that adsorption of ARS by TpEB-COF conformed to the pseudo-second-order kinetic equation and Langmuir adsorption model.The adsorption efficiency was 82.8%and the maximum adsorption capacity was 828 mg·g-1.This study not only lays a solid foundation for the design and synthesis of COF materials,but also expands the application scope of ionic COF materials.