Fig 1.
ZIF-8 structure.
Fig 2.
Manifold employed for online fixed-bed adsorption.
Fig 3.
Breakthrough curves of the continuous flow adsorption processes at the three tested OTC concentrations: 10, 25 and 40 mg L-1.
Table 1.
Breakthrough curve fixed-bed column adsorption parameters of the antibiotic OTC on ZIF-8.
Fig 4.
UV-VIS absorption spectra of OTC reference solution (10 mg L-1) in deionized water and eluates collected at different contact times with ZIF-8 to study possible antibiotic degradation.
Fig 5.
UV-Vis absorption spectra of OTC (25 mg L-1) in deionized water at different pH values.
Fig 6.
UV-Vis absorption spectra of OTC aliquots obtained in deionized water at different contact times with ZIF-8.
Fig 7.
UV-Vis absorption spectra of OTC aliquots of reference and after contact with Zn(CH3COO)2 for 24h.
Fig 8.
ESI(+)-MS of (A) Oxytetracycline, and (B) suspension of ZIF-8 supernatant.
Fig 9.
ESI(+)-MS of supernatant liquid aliquot: (A) after 3 minutes, and (B) after 120 minutes of contact between ZIF-8 and OTC.
Fig 10.
Overlapped IR spectra of ZIF-8, OTC, and the product of adsorption at different tested concentrations.
Fig 11.
Overlapping diffractograms of ZIF-8 and the different adsorption products after contact with OTC.
Fig 12.
TGA of (a) adsorption product after contact with 25 mg L-1 OTC, (b) OTC and (c) ZIF-8.
Fig 13.
Nitrogen adsorption/desorption isotherms of (A) ZIF-8, (B) ZIF-8 + 10 mg L-1 of OTC and (C) ZIF-8 + 25 mg L-1 of OTC.
Table 2.
Surface area and pore volume for ZIF-8 and ZIF-8 loaded with different amounts of OTC.