首页|UiO-66-NH2 nanoparticles supported on layered double hydroxides as an excellent adsorbent for levofloxacin capture
UiO-66-NH2 nanoparticles supported on layered double hydroxides as an excellent adsorbent for levofloxacin capture
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The adsorption performances of individual adsorbent such as UiO-66-NH2 and MgAl-layered double hydroxides(MgAl-LDH)toward levofloxacin(LVX)is less satisfactory due to the disappointing uptake capacity and adsorption efficiency.Herein,a 3D flower-like composite adsorbent prepared via iterative hydrothermal synthesis method anchoring UiO-66-NH2 nanoparticles onto the MgAl-LDH surface.Attributed to the synergistic effects of UiO-66-NH2,and MgAl-LDH,the MgAl-LDH@UiO-66-NH2 exhibits an outstanding adsorption performance toward LVX.Typically,the maximum LVX uptake capacity over MgAl-LDH@UiO-66-NH2 reached 268 mg/g,which was higher than that of the individual adsorption materials UiO-66-NH2(41 mg/g),MgAl-LDH(140 mg/g),and some adsorbents reported in previous literature.The rapid adsorption process can reach equilibrium within 20 min,which conformed well to the pseudo-second-order kinetics and the Langmuir isotherm model.Adsorption thermodynamic result also indicated that the adsorption was spontaneous and exothermic,simultaneous coexisting physical and chemical adsorption interactions.Importantly,the MgAl-LDH@UiO-66-NH2 still maintained excel-lent adsorption capacity with a slightly decrease after fifth cycle,exhibiting a remarkable reuse and stable performances.This work provides a highly novel strategy to prepare recyclable composite adsorbent for the LVX capture from aqueous solution.
Layered double hydroxidesUiO-66-NH2LVXAdsorption
Yan Li、Heng Lin、Qiaolan Yu、Na Ma、Wei Dai
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College of Geography and Environmental Sciences,Zhejiang Normal University,Jinhua,321004,China
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials,College of Chemistry and Materials Science,Zhejiang Normal University,Jinhua,321004,China
National Natural Science Foundation of ChinaJinhua Science and Technology Plan Project
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