TiO2上的CuAg纳米粒子用于高效乙醛光降解

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(CuAg/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。

CuAg nanoparticles on TiO2 for high-efficiency photodegradation of acetaldehyde

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.