One-pot In Situ Microwave Hydrothermally Grown Zeolitic Imidazolate Framework-8 on ZnIn-Layered Double Oxides toward Enhanced Methylene Blue Photodegradation

Abstract

Zeolitic imidazolate framework-8 (ZIF-8)/semiconductor nanocomposites were synthesized by a simple method. The nanocomposites were composed of the in situ grown ZIF-8 and supported ZnIn-layered double oxides (ZnIn-LDOs), in which ZnIn-LDOs were used as a Zn 2+ source to form ZIF-8. The ZnIn-LDOs were formed by calcining the microhydrothermally synthesized ZnIn-layered double hydroxide precursor. The effect of the ZIF-8 amount on the morphology and photocatalytic activity of nanocomposites was studied. The nanocomposites were composed of the aggregation of ZIF-8 in the shape of a dodecahedron and ZnIn-LDOs in the shape of a flower. The ZI-1-ZIF-8 exhibited excellent photodegradation activity, in which the degradation rate of methylene blue (MB) was 97% under 120 min simulated sunlight irradiation. Moreover, the photocatalytic degradation activity could still be maintained at 95% after five runs. The trapping experiment indicated that the reactive radicals of • OH play an important role in MB removal. Similarly, the experimental results showed that ZIF-8/ZnIn-LDOs could degrade ciprofloxacin under the simulated sunlight irradiation. Therefore, ZIF-8/ZnIn-LDOs nanocomposites have an important application prospect in photocatalytic degradation of pollutants.

Influence of mass ratio and calcination temperature on physical and photoelectrochemical properties of ZnFe-layered double oxide/cobalt oxide heterojunction semiconductor for dye degradation applications

“…The lattice spacing (Fig. 6B) of 0.263, 0.292, and 0.238nm coincides with ZnO (002) (Liu, Shao et al, 2020), (Liu, Zhai, Hu, Yang, & Liu, 2017). The binding energies at 726.4 eV and 713.5 eV along with their shake-up satellite peak at 719.2 eV are assigned to Fe 2p1/2 and Fe 2p3/2 (Fig.…”