Unsymmetrical dimethylhydrazine is a high-energy liquid rocket fuel widely utilized in the aerospace field. Its highly toxic nature poses a significant threat to the ecosystem and human health, necessitating the urgent development of efficient and environmentally friendly treatment technologies. In this study, a (001) crystal facet-dominated 001-TiO 2 /CeO 2 S-scheme heterojunction was constructed via a solvent hydrothermal-photoassisted method. Under simulated solar light irradiation, the catalyst demonstrated a degradation efficiency of 98.4 % for high-concentration Unsymmetrical dimethylhydrazine wastewater (100 mg/L) within 140 min, while effectively decomposing highly toxic intermediates with a mineralization rate reaching 84.5 %. This is attributed to the synergistic interaction between the crystal facet effect and the S-scheme heterojunction, which significantly enhances the spatial separation and transfer of photogenerated carriers. The intermediate products were identified using solid-phase microextraction coupled with gas chromatography-mass spectrometry (SPME-GC–MS), revealing the possible degradation pathways of Unsymmetrical dimethylhydrazine and elucidating the reaction mechanism. This study offers a viable approach for the efficient degradation of Unsymmetrical dimethylhydrazine wastewater, offering significant reference value for advancing wastewater treatment in the aerospace industry.
Unsymmetrical dimethylhydrazine (UDMH), as a high-energy liquid rocket fuel widely used for energy liquid rocket fuel, inevitably produces huge volumes of UDMH wastewater during use. As UDMH and its byproducts are both highly toxic, this poses a severe threat to ecological environment and human health, making it an urgent need to develop an efficient, environmentally friendly treatment for UDMH wastewater. Photocatalytic technology has emerged as a research hotspot in the field of water pollution control owing to its low cost and eco-friendliness. In this study, a (001) facet-dominated 001-TiO 2 /CeO 2 S-scheme heterojunction was constructed via a solvothermal-photoassisted method, effectively achieving primary carrier separation. Under simulated solar irradiation, this structure achieved a 98.7 % degradation efficiency for 100 mg/L UDMH wastewater within 140 min, with degradation rate constants 3.8 times and 5.5 times higher than those of 001-TiO 2 and P25, respectively. To address the challenge of recovering powdered photocatalysts, this study immobilized the nanopowders using a silver conductive adhesive, creating a two-dimensional conductor interface for electron transport and a nanoparticle structure for hole retention, thereby enabling secondary carrier separation. Under simulated solar irradiation, this immobilized structure achieved a 75.1 % degradation efficiency for 100 mg/L UDMH wastewater within 420 min. More importantly, it demonstrated excellent reusability and recyclability. This study provides a practical and feasible approach for the efficient degradation of UDMH wastewater.
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