Rational design of SnO2/Fe1.727Sn0.205O3 nanostructures as efficient photocatalysts for dye degradation under visible light

چکیده مقاله

Organic pollutants in wastewater can be treated sustainably with heterogeneous photocatalysts. Researchers have focused considerable attention on tin oxide (SnO2) due to its superior photocatalytic activity, affordability, and thermal stability. In this study, SnO2/Fe1.727Sn0.205O3 (SnO2/FSO) nanocomposites were successfully fabricated via carboxylic acid-assisted auto-combustion route. The DRS plot revealed a significant bandgap narrowing (1.75 eV), extending the optical response into the visible region. Vibrating sample magnetometer (VSM) indicated superparamagnetic properties, supporting the in-situ formation of SnO2/FSO nanocomposites and providing a potential route for magnetic separation. The photocatalytic performance of SnO2/FSO nanocomposites was evaluated using Rhodamine B and acid red 14 under simulated solar light. The optimized photoreactions including 30 mg of catalyst and 40 ppm of acid red 14 solution resulted in a maximum degradation efficiency of 81.96% within 120 min. Followed by a pseudo-first-order model, kinetic studies of SnO2/FSO nanocomposites were investigated in photocatalytic process. Scavenger experiments revealed that •OH was the dominant reactive species, accompanied by significant contributions from photogenerated h+ and •O2???? .