Wood-based three dimensional microreactors enabled by nitrogen doped interface engineering for high-efficiency catalytic reduction of various pollutants

Traditional catalytic powders face limitations like low recyclability, easy loss, and unsatisfactory reaction performance, a dual strategy approach combining support modification and interfacial electronic regulation was employed, and construct a novel wood-based three-dimensional porous microreactor (N/DPT@InCoOS). The findings reveal that the nitrogen doping temperature greatly affects on the catalytic reduction activity of the composite catalytic materials. N/DPT₁₅₀@InCoOS prepared at 150 °C exhibits the optimal catalytic performance, achieving complete reduction of MB dye within 3 min, with a reaction rate (k) of 1.083 min^-1, which is significantly higher than those prepared at other temperatures. Meanwhile, the material shows rapid and efficient reduction performance toward various pollutants, with catalytic activity markedly superior to that of the undoped DPT@InCoOS. Furthermore, the catalytic efficiency of the material remains over 94.0% following six cycles, reflecting excellent stability and good reusability. According to analyses, the crystalline structure of wood remains intact after nitrogen doping, and providing abundant anchoring sites for the efficient loading of InCoOS nanoparticles and constructing a stable interfacial coupling structure. The band gap is reduced to 1.81 eV, effectively enhancing light absorption and promoting charge carrier separation and electron transport. Nitrogen doping increases the electrochemical active surface area of material by approximately 61.55% and decreases the Tafel slope, thereby significantly improving interfacial charge transfer kinetics. With advantages including low expense, strong catalytic activity, easy recovery, and eco-friendliness, the nitrogen-doped delignified wood-based@InCoOS composite catalytic materials demonstrates significant potential serving as a microreactor for applications in environmental remediation.