Construction of TiO₂/LDHs Heterostructures with Interface Band Modulation and High-Efficiency Photodegradation of Methylene Blue

TiO2/LDHs composites were synthesized in different proportions using the co-precipitation method. Their structural characteristics, morphological characteristics and spectral responses were characterized by means of X-ray diffraction (XRD), raman spectra, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV-vis diffuse reflectance spectroscopy. The photocatalytic performance of TiO2/LDHs were tested with the degradation of methylene blue. The photocatalytic light source selected is simulated sunlight (300-watt xenon lamp). Experimental results demonstrate that constructing a robust heterojunction through precise interface band alignment significantly suppresses photogenerated electron-hole recombination. Controlled charge transfer pathways at the interface further enhance photocatalytic degradation efficiency. Among the tested catalysts, AT11 (Al:Ti=1:1, molar ratio ) exhibits the highest photocatalytic activity, degrading 98.2% of methylene blue within 70 minutes under simulated solar irradiation. The degradation process follows first-order kinetics and maintains stable performance over four reuse cycles. Radical trapping experiments identify h⁺ and ·OH as the dominant active species responsible for dye degradation. This TiO₂/LDHs heterostructure significantly enhances TiO₂’s photocatalytic efficiency, enabling efficient solar energy utilization.