Removal of Mercury Ions from Water by Triazine Porous Organic Polymers Rich in Nitrogen and Oxygen Groups
Journal of molecular structure(2024)
摘要
Using Knoevenagel condensation reaction, two novel porous organic polymers TMTA-DHa and TMTA-TP with olefins were prepared for the removal of mercury ions from water. The material TMTA-TP among them promotes enol-keto reciprocal isomerization during the adsorption of mercury ions. These two polymers are rich in nitrogen and oxygen atoms, which provide more active sites and enhance the binding of Hg2+. Under the synergistic effect of nitrogen and oxygen, both materials showed good adsorption of Hg2+. The presence of enol-keto reciprocal isomerization form in the TMTA-TP material, as well as the presence of certain crystallinity, resulted in higher adsorption than that of the TMTA-DHa material. The adsorption process was better described by the pseudo-second-order kinetic model and Langmuir isotherm model, and the maximum adsorption amount reached 658.9 mg g-1 and 398.7 mg g-1, respectively. Thus, the two polymeric materials obtained, TMTA-DHa and TMTA-TP, were effective adsorbents for Hg2+ removal.
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关键词
Mercury removal,Porous organic polymers,Effective adsorbent,Synergistic effect of nitrogen and oxygen,Enol-keto isomerism
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