In-situ constructed tactic of palladium nanoparticles supported on hierarchical porous wood-derived cellulose framework towards efficient catalytic reduction on 4-nitrophenol.

With the advancement of technology, the production of domestic sewage and industrial wastewater containing dyes are increasing steadily. In the evolutionary process of catalytic reduction wastewater, recyclability and homogenization are still puzzles. Herein, a wood-derived cellulose catalytic system with hierarchical pore structure was proposed based on chlorite-alkali method for efficient catalytic reduction on 4-nitrophenol (4-NP). The chlorite-alkali hydrolysis process played a significant role in enhancing channel connectivity and hydrophilicity of balsa (BS, O. pyramidale) when removing lignin and hemicellulose. The results of cumulative complete intrusion and extrusion showed that the porosity of BS increased from 76.07 % to 92.58 % after removing components. A universal in-situ constructed tactic of PdNPs supported on a dehemicellulose BS (DHBS) without external reducing agent. Additionally, the superhydrophilic hierarchical porous wood-derived cellulose structure had a synergistic effect with plasmonic enhancement of PdNPs on the catalytic reduction of 4-NP, resulting in reducing 4-NP rapidly, which achieving a reduction efficiency of 90 % in the 90 s with the rate constant of 1.51 min. The approach addressed the issue of low catalytic metal particle load and hider catalytic activity resulting from the limited thickness and porosity, and has a good application prospect in wastewater treatment.