K₂Ti₆O₁₃/TiO₂ nanocomposite photocatalysts were synthesized via a precipitation-calcination method using water extract of wood ash (WEWA) as a precipitating agent from waste. As the WEWA solution was basic and contained K⁺ ions, a chemical base and potassium source were not required for this synthesis. The as-synthesized products were calcined at 500, 600, 700, and 800 °C and the calcined products were characterized by X-ray diffractometry (XRD), transmission electron microscopy (TEM), UV–Vis diffuse reflectance spectroscopy (UV–Vis DRS), X-ray photoelectron spectroscopy (XPS), and surface area analysis. The K₂Ti₆O₁₃/TiO₂ photocatalyst exhibited a high adsorption capacity for methylene blue (MB) and crystal violet (CV) molecules but a low adsorption capacity for rhodamine B (RhB). As the photocatalytic process for K₂Ti₆O₁₃/TiO₂ occurred through the dye sensitization mechanism, MB and CV were degraded faster than RhB. In the case of MB and CV, a small amount of H₂O₂ added to the dye solution improved the rate of photocatalytic degradation and reusability. Moreover, the treated MB and CV solutions were non-cytotoxic toward L929 and Vero cells.

以木灰水提取物（WEWA）为废料中的沉淀剂，通过沉淀-煅烧法合成了K ₂ Ti ₆ O ₁₃ / TiO ₂纳米复合光催化剂。由于WEWA溶液是碱性溶液且包含K ⁺离子，因此该合成不需要化学碱和钾源。合成后的产品在500、600、700和800°C下煅烧，煅烧后的产品通过X射线衍射（XRD），透射电子显微镜（TEM），UV-Vis漫反射光谱（UV-Vis）进行表征。 DRS），X射线光电子能谱（XPS）和表面积分析。K ₂ Ti ₆ O ₁₃ / TiO_2型光催化剂对亚甲基蓝（MB）和结晶紫（CV）分子具有高吸附能力，但对罗丹明B（RhB）的吸附能力低。由于K ₂ Ti ₆ O ₁₃ / TiO ₂的光催化过程是通过染料敏化机理发生的，因此MB和CV的降解速度要比RhB快。在MB和CV的情况下，向染料溶液中添加少量的H ₂ O ₂可以提高光催化降解的速度和可重复使用性。此外，处理过的MB和CV溶液对L929和Vero细胞无细胞毒性。