【摘要】 光降解乙醛（CH₃CHO）是一种新型高效的乙醛去除方法，通常采用 TiO₂作为光催化剂。然而 TiO₂对乙醛吸附能力较弱，对产物的选择性较低，电子-空穴对重组率较高，严重限制了对乙醛的降解性能。本研究通过在 TiO₂上负载 CuAg 纳米粒子（Cu Ag/TiO₂），成功构建了高效稳定的光催化降解乙醛催化剂，有效解决了 TiO₂的固有缺陷。在自然光照射下，CuAg/TiO₂对乙醛的降解率高达 42.49%。连续 4 轮全光谱光催化降解乙醛，CuAg/TiO₂活性均保持在 98.89%以上。进一步的机理研究表明，CuAg/TiO₂中的 CuAg 纳米粒子在光照下产生热电子，随后热电子转移到 TiO₂和吸附在Ag 位点上的氧中。CuAg/TiO₂上生成的超氧自由基能有效地降解乙醛，从而在乙醛降解过程中表现出优异的性能。更多还原

【Abstract】 Photodegradation of acetaldehyde serves as a novel and efficient approach for removing acetaldehyde, and TiO₂ is generally used as a photocatalyst. However, TiO₂ has a weak adsorption capacity for acetaldehyde, low product selectivity, and high electron-hole pair recombination rate, which significantly limit the treatment performance of acetaldehyde. In this study, we successfully constructed a highly active and stable photocatalyst for photocatalytic degradation of acetaldehyde by loading CuAg nanoparticles on TiO₂（CuAg/TiO₂）, which efficiently solved the inherent defects of TiO₂. The degradation rate of acetaldehyde on CuAg/TiO₂ was up to 42.49 % under the irradiation of natural sunlight. CuAg/TiO₂ retained above 98.89% of initial activity after four successive rounds of full spectrum photodegradation. Further mechanism studies indicated that CuAg nanoparticles in CuAg/TiO₂ generated hot electrons under light, followed by the transfer of hot electrons to TiO₂ and oxygen adsorbed on Ag sites. The generated superoxide radicals on CuAg/TiO₂ can efficiently degradate acetaldehyde, resulting in the remarkable performance in the removal process of acetaldehyde.更多还原