Enhanced Photocatalytic Degradation of Tetracycline Hydrochloride via Optimized g-C3N4/Ba0.7Sr0.3TiO3 Composite Ratios

Photocatalytic technology, renowned for its green, economical, and highly efficient characteristics, has garnered significant attention in the fields of wastewater treatment and environmental remediation. In this study, Ba0.7Sr0.3TiO3 was synthesized via the solid-state method, and g-C3N4 was incorporated to construct a g-C3N4/Ba0.7Sr0.3TiO3 multiphase composite with enhanced photocatalytic performance. The photocatalytic efficiency of the composite catalysts with varying mass fractions was evaluated for the degradation of tetracycline hydrochloride. The g-C3N4/Ba0.7Sr0.3TiO3 composite was characterized using XRD, SEM, UV–Vis, and PL techniques to analyze its crystal structure, microstructure, and optical properties. The results demonstrated that the composite with 5% g-C3N4 mass fraction exhibited the highest photocatalytic activity, achieving a tetracycline hydrochloride degradation rate of 86% within 120 min, compared to 67% for pure Ba0.7Sr0.3TiO3. These findings indicate that the incorporation of g-C3N4 effectively reduces the band gap of the composite, increases carrier concentration, and significantly enhances photocatalytic performance. This study highlights the potential of g-C3N4/Ba0.7Sr0.3TiO3 as a promising material for photocatalytic applications in environmental remediation.