Abstract:
The environmental pollution caused by any organic dye-containing wastewaters in textile,
plastic, pulp, and paper industry is one of key problems. For this reason, UiO-66 and
UiO-66- NH2, photocatalysts were synthesized in different options by solvothermal and hydrot
hermal method at Room Temperature and High Temperature condition to remove dyes from
aqueous solution as well as real sample. Hence, Zirconium MOFs samples were synthesised
successfully at Room Temperature and High Temperature with solvent Di-ionized Water and
with DMF, respectively. Zr-MOFs samples were characterized for thermal stability, structure
and crystallinity, topology, band gap energy, surface area and porosity, the presence of
organic functional groups and optical intensity by TGA, XRD, SEM, UV-Vis, BET, FTIR and
PL, respectively. The synthesized MOFs show, high thermal stability, excellent crystallinity,
higher surface area, larger pore volume and less optical intensity. In this study, the effects of
key parameters were examined to find out the optimum operating conditions of the
photocatalytic degradation of methyl orange dye using Zr-MOFs under visible light radiation.
The photocatalytic degradations of MO using all the as-synthesized photocatalysts were investigated under visible light irradiation. High performance of UiO-66-NH2-DMF-TEA-HT
towards degradation under visible light was observed. In effect, its lower PL intensity and the
smaller band gap energy have enhanced the photocatalytic process by prolonging the electron-hole recombination. In addition, amine-functionalized Zirconium MOFs have better
degradation efficiency than non-functionalized MOFs. Moreover, UiO-66-NH2-TEA can be
easily regenerated and re-used for several times, which show this photocatalyst could have
large potential for the degradation of dye-containing wastewater. Finally, the experimental
results of selected MOFs were effective for the removal of MO aqua solution (88.93%) and
real sample textile wastewater (71.24%).
