Synergistic removal of organic pollutants by Co-doped MIL-53(Al) composite through the integrated adsorption/photocatalysis

Co-doped metal organic frameworks (MOFs) were fabricated by a facile route and applied to remove (tetracycline, congo red, methylene blue and rhodamine B) through integrated adsorption and photocatalysis. The assembled MOFs composite exhibited larger S-BET (889 m(2)/g), broad light adsorption, and accelerated carrier kinetics, which helped to enhance adsorption and photocatalysis performance. Specifically, nearly 100% TC (40 mg/L) could be removed by the Co-MIL-10 within 12 min solar-light irradiation, significantly faster than that of solo MIL-53(Al) (82%) and CoAl-LDH (54%), separately. Furthermore the obtained rate constant (0.2064 min(-1)) was 4.8 times and 9.7 times greater than that of MIL-53(Al) and CoAl-LDH, respectively. The quenching/EPR characterization suggested that photo-generated h(+)/O-center dot(2)-(OH)-O-/center dot species were responsible for TC oxidation, of which hthorn showed the great impact. Cycling experiments verified the robust stability of the MOFs catalyst. As well, an underlying photocatalytic mechanism of the current system was investigated in detail.

Automated summary

Co-doped metal organic frameworks (MOFs) were fabricated using a facile method and applied for the removal of tetracycline, congo red, methylene blue, and rhodamine B through adsorption and photocatalysis. The assembled MOFs composite exhibited enhanced adsorption and photocatalysis performance, with nearly 100% removal of tetracycline achieved within 12 minutes of solar-light irradiation. The obtained rate constant was significantly higher than other materials, demonstrating the potential of Co-MIL-10 as an efficient catalyst for pollutant degradation.