Preparation and Adsorption Performance for U(Ⅵ) of ZnO@ZIF-8 Core@Shell Microspheres†

doi:10.7503/cjcu20180469

Abstract

Abstract:

ZnO@ZIF-8 core@shell microspheres were synthesized by a hydrothermal method and applied for the efficient adsorption of U(Ⅵ) from aqueous solution. The size of synthesized ZnO@ZIF-8 core@shell microspheres was in the range of 1—7 μm. The batch experimental results revealed that the sorption of U(Ⅵ) on ZnO@ZIF-8 was strongly dependent on pH, and the maximum sorption capacity of U(Ⅵ) on ZnO@ZIF-8 was 145.32 mg/g at pH=4.0. The adsorption mechanism could be mainly attributed to the coordination and the hydrogen bonding between ZIF-8 framework and U $O 2 2 +$ ions. Considering that the content of ZIF-8 in the composite microspheres was only 12.6%, the unit adsorption capacity of U(Ⅵ) is up to 1137 mg/g.

Key words: ZnO, ZIF-8, Composite microspheres, Uranium adsorption

CLC Number:

O614

TrendMD:

WANG Fuxiang,CHEN Ziyu,YANG Weiting,LIU Lijuan,REN Guojian,LIU Yanfeng,PAN Qinhe. Preparation and Adsorption Performance for U(Ⅵ) of ZnO@ZIF-8 Core@Shell Microspheres^†[J]. Chem. J. Chinese Universities, 2019, 40(1): 24.

Figures/Tables 8

Fig.1 XRD patterns of ZnO(a), ZIF-8(b) and ZnO@ZIF-8(c)

Fig.2 SEM images of ZnO microspheres(A, B) and ZnO@ZIF-8 microspheres(C, D)

Fig.3 TEM images of ZnO microspheres(A) and ZnO@ZIF-8 microspheres(B)

Fig.4 TG curves of ZIF-8(a) and ZnO@ZIF-8(b) microspheres

Fig.5 PXRD patterns of ZIF-8(a), ZnO@ZIF-8(b) and ZnO@ZIF-8 microspheres in aqueous solution with pH of 6(c), 5(d), 4(e), 3(f) and 2(g)

Fig.6 Effect of pH value of solution on adsorption of uranium by ZnO@ZIF-8 [U(Ⅵ)]initial=100 mg/L, msorbent/Vsolution=0.4 mg/mL, t=4 h.

Fig.7 Effect of reaction time on the uranium adsorption by ZnO@ZIF-8 microspheres [U(Ⅵ)]initial=100 mg/L, msorbent/Vsolution=0.4 mg/mL, pH=4.

Fig.8 Effect of initial concentration of solution on uranium adsorption by ZnO@ZIF-8 msorbent/Vsolution=0.4 mg/mL, pH=4, t=4 h.

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