This work prepared palladium-doped titanium dioxide (Pd-doped TiO₂) catalysts by a facile sol-gel method to enhance degradation of single and binary methylene blue and methyl orange by ultraviolet photocatalysis. The physicochemical properties of Pd-doped TiO₂ particles were analyzed by a X-ray powder diffractometer, X-ray photoelectron spectroscope, scanning electron microscope, transmission electron microscope, UV–visible diffuse reflectance spectroscope, sorptiometer, and transient photocurrent spectroscope. More efficient degradation was achieved in acidic and basic/neutral media for methyl orange and methylene blue, respectively. Also, methylene blue was always degraded faster than methyl orange. The highest degradation efficiency of both dyes in single and binary systems was obtained using 0.5 wt.% and 0.75 wt.% PdTiO₂, respectively. The degradation pathways of single methylene blue and methyl orange with Pd-doped TiO₂ and commercial P25TiO₂ were proposed and compared by identifying reaction intermediates produced during photocatalysis. Recycling tests have confirmed excellent stability of PdTiO₂ materials. Also, the prepared materials were easier to separate from the treated liquid using a simple sedimentation or filtration method than P25TiO₂. In particular, the use of sol-gel method could readily synthesize a large number of catalysts, which was beneficial for scale up consideration. All these factors highlighted their potential and prospect in practical applications for water reuse.

这项工作通过一种简便的溶胶-凝胶法制备了钯掺杂的二氧化钛（Pd掺杂的TiO ₂）催化剂，以增强单和二甲基亚甲基蓝和甲基橙的紫外光催化降解作用。Pd掺杂TiO ₂的理化性质用X射线粉末衍射仪，X射线光电子能谱仪，扫描电子显微镜，透射电子显微镜，紫外可见漫反射光谱仪，吸能计和瞬态光电流谱仪分析了颗粒。在酸性介质和碱性/中性介质中，甲基橙和亚甲基蓝分别实现了更有效的降解。而且，亚甲基蓝的降解总是快于甲基橙。分别使用0.5 wt。％和0.75 wt。％的Pd TiO ₂可获得两种染料在单系统和二元系统中的最高降解效率。Pd掺杂的TiO ₂和商用P25 TiO ₂的单一亚甲基蓝和甲基橙的降解途径提出并通过鉴定在光催化过程中产生的反应中间体进行比较。回收测试已证实Pd TiO ₂材料具有出色的稳定性。而且，与P25 TiO ₂相比，使用简单的沉降或过滤方法，所制备的材料更易于与处理后的液体分离。特别地，使用溶胶-凝胶法可以容易地合成大量的催化剂，这对于规模化的考虑是有利的。所有这些因素凸显了它们在回用水的实际应用中的潜力和前景。