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Abstract
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In this study, ternary composites of MIL-101(Fe) with TiO2 using different amounts of GO were synthesized and utilized for photocatalytic destruction of methylene blue (MB) and tetracycline. MIL-101/TiO2/GO ternary composites were prepared using three different amounts of GO (5, 10, and 15 wt% denoted as MIL/TiO2/(5 %) GO, MIL/TiO2/(10 %)GO, and MIL/TiO2/(15 %)GO, respectively). Characterization of the fabricated samples was conducted through XRD, FESEM, EDX, BET-BJH, FTIR, DRS and PL analyses. The effects of operational parameters on contaminant degradation were studied. The ternary composite with 5 wt% of GO displayed the best efficiency in photocatalytic reaction. Dye degradation was 98 % after 120 min of light radiation (visible LED) using 0.15 g/L of MIL/TiO2/(5 %)GO ternary composite. By increasing MB concentration, penetration length of light and photons in the reaction medium was significantly reduced. Thus, lower excitation of photocatalysts led to the less generation of electron-hole pairs and thereby less production of active radicals. The MB degradation ability remained satisfactory after five recycling cycles (98 %, 95 %, 92 %, 90 %, and 88 %). Also, the synthesized composite degraded tetracycline. Creating a heterojunction structure of MOF and TiO2 along with incorporating the optimal amount of GO (MIL/TiO2/(5 %)GO) led to a high activity for the photocatalytic degradation of pollutant.
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