Abstract
The amorphous porous layered-Al2O3 derived from aluminium fumarate metal-organic frameworks (AlFu MOFs) by roasting at 773K under air has been applied to remove fluorine ions from industrial ZnSO4 solution. The amorphous porous layered-Al2O3 was characterized by XRD, SEM and BET. The adsorption experiments were conducted under different conditions, including adsorbent dosage, initial pH, adsorption temperature and adsorption time. And the process of removing fluorine ions is well fitted with the pseudo-second-order kinetic model and Langmuir isotherm model, which is studied by the adsorption kinetics and isotherms. The theoretical maximum adsorption capacity was 12.05mgg−1. Moreover, the adsorption mechanism of the amorphous porous layered-Al2O3 was analyzed by SEM-EDS and FTIR. The results indicate that the adsorption process is affected by complexation and ion exchange between fluorine ions and amorphous porous layered-Al2O3. The regeneration of the amorphous porous layered-Al2O3 shows that the adsorbent could be reused to reduce the production cost.
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