摘要
吸附的本质是吸附质分子与材料框架间的相互作用,因此吸附效果的好坏与材料框架息息相关。合理的材料设计不仅需要精准把控材料孔道结构、孔径大小等因素,还离不开对材料孔道微环境的精心调控。为探究质子化吡啶基团带来的框架电荷对废水中铬黑T染料的去除效果,一对同构的共价有机框架材料TpTtp(含吡啶基团)及TpTta(不含吡啶基团)被用于进行对照实验。这2种材料在盐酸溶液中浸泡处理后,TpTtp表现出了更高的铬黑T去除率(150 mg/L初始质量浓度时,TpTtp与TpTta的去除率分别为98%、59%),推测这是由材料正离子框架与阴离子染料铬黑T之间的库仑相互作用决定的。甲基橙溶液及阴-阳混合染料(铬黑T-罗丹明B)的吸附实验进一步证实了这个猜想,质子化的吡啶基团会使材料框架更倾向于吸附带有负电荷的阴离子染料分子。
The essence of adsorption is the interaction between adsorbate molecules and material framework.Therefore,the adsorption effect of the material is governed by its structure.Reasonable material design requires not only precise control of its pore structure and pore size,but also the careful tunning of the pore microenvironment of the framework.In order to explore the effect of the framework charge caused by the protonated pyridine group on the removal of Eriochrome Black T(EBT)dye from wastewater,a pair of isostructural covalent organic framework materials,TpTtp(with pyridine group)and TpTta(without pyridine group),are used in control experiments.After being immersed in hydrochloric acid solution,TpTtp exhibits much higher removal rates for EBT(98%and 59%for TpTtp and TpTta,respectively,at an initial concentration of 150 mg/L).We attribute this to the Coulomb force between the positive ionic framework of TpTtp and the anionic EBT molecules.Adsorption experiments of methyl orange solutions,and anionic-cationic mixed dye solutions(EBT-Rhodamine B)further support our hypothesis,indicating that protonated pyridine groups can endow the porous materials with higher adsorption affinity to negatively charged dye molecules.
作者
汤镇岭
吕佳澳
彭昊欣
谢林华
王柯成
李建荣
TANG Zhenling;LÜJiaao;PENG Haoxin;XIE Linhua;WANG Kecheng;LI Jianrong(College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China)
出处
《北京工业大学学报》
北大核心
2026年第3期334-342,共9页
Journal of Beijing University of Technology
基金
国家自然科学基金资助项目(22178010)。
关键词
共价有机框架
吡啶基团
铬黑T
库伦力
带电荷框架
染料去除
covalent organic frameworks
pyridine groups
Eriochrome Black T
Coulomb force
charged frameworks
dye remove
