Study on Adsorption of Functional Nitrogen Heterocyclic Carbene Polymeric Resin for Cu2+
The functional nitrogen heterocyclic carbene polymeric resin(PNO)was synthesized for the removal of Cu2+from wastewater.Based on static and dynamic adsorption experiments,the adsorption effect of PNO on Cu2+in wastewater was studied.The results showed that the optimal adsorption conditions of PNO for Cu2+were as 100 mg of adsorbent dosage,30 minutes of adsorption time,4～5.9 of pH,a temperature of 298 K,and a rotational speed of 150 r/min.The maximum adsorption capacity was 51.55 mg/g.The adsorption process was consistent with the Langmuir and Freundlich isothermal adsorption models,as well as the pseudo-second-order kinetic model.The dynamic adsorption capacity increased with the decrease in flow velocity,the increase in column height,and Cu2+concentration.Thomas and Bohart-Adams models'results indicated that the predicted values were consistent with the experimental data(R2＞0.92).After 5 rounds of static adsorption and desorption,and 3 cycles of dynamic regeneration,the removal rate still exceeded 96％of the initial cycle,indicating effec-tive removal and regeneration capabilities.This study highlighted that PNO had a wide application prospect for the efficient treatment of copper-containing wastewater.
functional nitrogen heterocyclic carbene polymeric resinCu2+adsorption propertyadsorption model
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