Catalytic degradation of organic contaminants is at the frontier of water treatment due to its selectivity, energy savings, and ability to convert harmful contaminants into harmless or even valuable chemical products for recycling. However, achieving sufficiently high performance in the catalytic removal of organic contaminants for practical application is still extremely challenging. Herein, we report a Pd-decorated TiO₂ (Pd/TiO₂) hierarchical vertical array for fast and efficient catalytic water treatment. Such a forestlike Pd/TiO₂ vertical array demonstrates the following distinct advantages over conventional planar or bulk catalytic systems: 1) abundant anchoring sites for nanocrystals loading; 2) high sunlight absorption; 3) efficient mass transfer channels for the reactants and products. As a proof of concept, the Pd/TiO₂ array demonstrated rapid and efficient photo-assisted catalytic reduction of high concentrations of 4-nitrophenol wastewater (2 g/L, ca. 14.38 mmol/L) and its feasibility for continuous flow wastewater treatment. The turnover frequency (TOF) value of the Pd/TiO₂ array was up to 8.00 min⁻¹, which was approximately 4.2 times that of planar Pd/TiO₂ film with the same area (1.91 min⁻¹). Our strategy of incorporating nanocatalysts with a hierarchical vertical array provides a promising approach to boosting the catalytic performance of catalysts for different chemical reactions.

有机污染物的催化降解因其选择性、节能性以及将有害污染物转化为无害甚至有价值的化学产品以供回收的能力而处于水处理的前沿。然而，在实际应用中实现足够高性能的催化去除有机污染物仍然极具挑战性。在此，我们报道了一种用于快速高效催化水处理的Pd修饰的TiO ₂ (Pd/TiO _{2 )分层垂直阵列。}这样的森林般的Pd/TiO ₂与传统的平面或本体催化系统相比，垂直阵列具有以下明显优势：1）丰富的纳米晶体负载锚定位点；2）阳光吸收率高；3）反应物和产物的高效传质通道。作为概念验证，Pd/TiO ₂阵列展示了快速高效的光辅助催化还原高浓度 4-硝基苯酚废水（2 g/L，约14.38 mmol/L）及其连续流废水处理的可行性。_{Pd/TiO 2}阵列的转换频率（TOF）值高达8.00 min ^-1，约为相同面积的平面Pd/TiO _{2薄膜（1.91 min} ^{-1 ）的4.2倍。}）。我们将纳米催化剂与分层垂直阵列相结合的策略提供了一种有前途的方法来提高催化剂对不同化学反应的催化性能。