Herein we present a facile approach for the preparation of a novel hierarchically porous carbon,in which seaweeds serve as carbon source and KOH as activator.The fabricated KOH-activated seaweed carbon(KSC)displays st...Herein we present a facile approach for the preparation of a novel hierarchically porous carbon,in which seaweeds serve as carbon source and KOH as activator.The fabricated KOH-activated seaweed carbon(KSC)displays strong affinity towards tetracycline with maximum uptake quantity of 853.3 mg/g,significantly higher than other tetracycline adsorbents.The superior adsorption capacity ascribes to large specific surface area(2614 m^(2)/g)and hierarchically porous structure of K-SC,along with strongπ-πinteractions between tetracycline and KSC.In addition,the as-prepared K-SC exhibits fast adsorption kinetics,capable of removing99%of tetracycline in 30 min.Meanwhile,the exhausted K-SC can be regenerated for four cycling adsorption without an obvious degradation in capacities.More importantly,p H and ionic strengths barely affect the adsorption performance of K-SC,implying electrostatic interactions hardly play any role in tetracycline adsorption process.Furthermore,the K-SC packed fixed-bed column(0.1 g of adsorbents)can continually treat 2780 m L solution spiked with 5.0 mg/g tetracycline before reaching the breakthrough point.All in all,the fabricated K-SC equips with high adsorption capacity,fast adsorption rate,glorious anti-interference capability and good reusability,which make it hold great feasibilities for treating tetracycline contamination in real applications.展开更多
基金supported by the National Key R&D Program of China(2017YFA0207202)the National Natural Science Foundation of China(No.41701259,No.51572263,and No.51772299)。
文摘Herein we present a facile approach for the preparation of a novel hierarchically porous carbon,in which seaweeds serve as carbon source and KOH as activator.The fabricated KOH-activated seaweed carbon(KSC)displays strong affinity towards tetracycline with maximum uptake quantity of 853.3 mg/g,significantly higher than other tetracycline adsorbents.The superior adsorption capacity ascribes to large specific surface area(2614 m^(2)/g)and hierarchically porous structure of K-SC,along with strongπ-πinteractions between tetracycline and KSC.In addition,the as-prepared K-SC exhibits fast adsorption kinetics,capable of removing99%of tetracycline in 30 min.Meanwhile,the exhausted K-SC can be regenerated for four cycling adsorption without an obvious degradation in capacities.More importantly,p H and ionic strengths barely affect the adsorption performance of K-SC,implying electrostatic interactions hardly play any role in tetracycline adsorption process.Furthermore,the K-SC packed fixed-bed column(0.1 g of adsorbents)can continually treat 2780 m L solution spiked with 5.0 mg/g tetracycline before reaching the breakthrough point.All in all,the fabricated K-SC equips with high adsorption capacity,fast adsorption rate,glorious anti-interference capability and good reusability,which make it hold great feasibilities for treating tetracycline contamination in real applications.
