Work

Tailoring the structure and morphology of hematite via Zn doping for superior photocatalytic degradation of Rhodamine B

Year: 2026

Type: article

Abstract: The widespread occurrence of organic dye pollutants poses serious environmental concerns, demanding efficient treatment strategies. This study reports the photocatalytic degradation of the cationic dye Rhodamine B (RhB) using Zn-doped hematite synthesized by a cost-effective sol-gel method, with Zn concentrations ranging from 2% to 10%. Structural analyses confirmed the retention of the rhombohedral hematite phase (R-3c) without secondary phases, along with lattice expansion, a decrease in crystallite size from 17.1 to 13.1 nm, and a slight shift of the (104) peak toward lower diffraction angles, confirming substitutional Zn incorporation, while FTIR and XPS results verified Fe-O bonding, successful Zn incorporation, mixed Fe 2+ /Fe 3+ states, and increased oxygen vacancies with higher Zn content. SEM revealed notable morphological variations and enhanced particle aggregation. Band-gap narrowing from 2.01 to 1.91 eV was observed with increasing Zn doping. Magnetic measurements indicated weak ferromagnetic behavior with Zn-dependent modulation of coercivity and saturation magnetization. The 10% Zn-doped sample achieved 95% RhB degradation within 160 min, with superior performance under mildly basic conditions (pH 10).

Source: Open Ceramics

DOI: 10.1016/j.oceram.2026.100943