Visible Photocatalytic Degradation of Methylene Blue on Magnetic Semiconducting La modified M-type Strontium Hexaferrite

TL;DR

This study demonstrates that La-modified M-type strontium hexaferrite effectively degrades methylene blue under visible light, combining magnetic properties with photocatalytic activity, offering a novel approach for dye wastewater treatment.

Contribution

Introduces a new magnetic semiconductor catalyst, La0.2Sr0.7Fe12O19, with efficient visible-light photocatalytic degradation of methylene blue, differing from conventional catalysts like TiO2.

Findings

Achieves complete degradation of methylene blue in 6 hours

Exhibits a direct band gap of 1.47 eV suitable for sunlight harvesting

Displays strong magnetic properties enabling easy separation

Abstract

Methylene blue (MB) is a representative of a class of dyestuffs resistant to biodegradation. This paper presents a novel photocatalytic degradation of methylene blue (MB) by La modified M-type strontium hexaferrite (La0.2Sr0.7Fe12O19) compound, which is a traditional permanent magnet and displays a large magnetic hysteresis (M-H) loop. The remnant magnetic moment and coercive field are determined to be 52emu/g and 5876Oe, respectively. UV-Visible optical spectroscopy reveals that La0.2Sr0.7Fe12O19 is simultaneously a semiconductor, whose direct and indirect band gap energies are determined to be 1.47 eV and 0.88 eV, respectively. The near infrared band gap makes it a good candidate to harvest sunlight for photocatalytic reaction or solar cell devices. This magnetic compound demonstrates excellent photocatalytic activity on degradation of MB under visible illumination. The colour of MB dispersion solution changes from deep blue to pale white and the absorbance decreases rapidly from 1.8 down to zero when the illumination duration extends to 6 hours. Five absorption bands did not make any blue shifts along with the reaction time, suggesting a one-stepwise degradation process of MB, which makes La0.2Sr0.7Fe12O19 a unique magnetic catalyst and differs from TiO2 and other conventional catalysts.