Design and fabrication of novel MIL-۵۳(Fe)/MIL-۱۰۱(Cr)/NiFe۲O۴ nanocomposite towards sonocatalytic degradation of toxic organic dyes

In this research, the sonocatalytic performance of the novel magnetically separable MIL-۵۳(Fe)/MIL-۱۰۱(Cr)/NiFe۲O۴ nanocomposite was investigated by the H۲O۲-assisted ultrasonic system for the degradation of water soluble organic dye contaminants, involving methylene blue (MB), rhodamine B (RhB) and methyl orange (MO). The MIL-۵۳(Fe)/MIL-۱۰۱(Cr)/NiFe۲O۴ nanocomposite was synthesized via the ultrasonic-assisted hydrothermal method. The FESEM/EDAX, XRD, FTIR, VSM, and BET were applied for the identification of the morphology and structure of the as-manufactured nanocomposite. Compared with H۲O۲/sonolysis, the higher degradation of MB dye (۲۵ mg/L) was attained by the sonocatalytic reaction. Plus, by the addition of hydroxyl radical (•OH) and hole quenchers decreased the degradation yield from ۹۷% to ۳۲% and ۷۴% after ۲۰ min, indicating the •OH free radicals as main oxidizing agent of the above-mentioned process. As well, the magnetic feature of the sample helped for quickly separation of the nanocomposite, made it recyclable with a trivial decline in the activity even after ۴ sequential cycles.

Keywords:

MIL-۵۳(Fe)/MIL-۱۰۱(Cr)/NiFe۲O۴ , metal organic framework , nanocomposite , catalyst , organic dyes , sonodegradation