Effect of magnesium ferrite doping with lanthanide ions on dark-, visible- and UV-driven methylene blue degradation on heterogeneous Fenton-like catalysts

The catalytic behavior of magnesium ferrites doped with lanthanide ions (La3+, Ce3+, Sm3+, Gd3+, and Dy3+) on Methylene Blue (MB) degradation using Fenton process was studied. A slow increase in cubic Fd3m crystalline structure parameters and increase in crystallite size of doped samples magnesium ferrites were observed. A dramatic decrease in catalytic activity of catalysts obtained at 600 degrees C as compared to catalysts obtained at 300 degrees C was explicitly observed and this was grossly attributed to the elimination of surface hydroxyl groups as ascertained by FT-IR analysis. The initial magnesium ferrite demonstrated the highest catalytic activity under dark-(k' 0.0555 min(-1)) and visible-light (k' 0.1029 min(-1)) conditions. Catalytic efficiency of the lanthanides doped catalysts under UV-irradiation in accordance with the maximum appearance rate constant k' decreased in the following order Ce3+ > Dy3+ > La3+ approximate to MgFe2O4 > Sm3+ > Gd3+. The most active ferrites provided up to 99% of MB degradation in 60 and 20 min for visible-and UV-driven Fenton processes. Findings obtained from this study were observed to be competitive with other heterogeneous Fenton catalysts.

Automated summary

The catalytic behavior of lanthanide-doped magnesium ferrites in the degradation of Methylene Blue using the Fenton process was studied. The doped samples showed an increase in crystalline structure parameters and crystallite size, with a significant decrease in catalytic activity at higher temperatures. Under UV irradiation, lanthanide-doped catalysts exhibited varying levels of efficiency, with the most active ferrites achieving up to 99% MB degradation in both visible-light and UV-driven Fenton processes.