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.
Abstract
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 two-dimensional 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.
维普
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