挥发性有机化合物(VOCs)的持续排放不仅导致严重的环境问题,也对人们的健康构成巨大威胁。光热催化氧化VOCs被认为是一种绿色可持续的技术。因此,需要优异的催化剂来实现高效利用光能并驱动催化反应。以凹凸棒石(ATP)为载体,通过溶胶-凝胶法合成了尖晶石NiCo2O4/ATP复合材料。Ni离子的存在改变了电荷转移机制,通过捕获激发电子等方式与Co离子之间相互作用,从而产生了优异的光吸收能力。在光照下,1∶5 NiCo2O4/ATP催化剂吸收可见与红外光,诱发晶格振动,最终将光子的能量转化为热量,使其在无需额外加热下即可实现优异的光生热能力(195.6℃)。ATP的引入促进了高效的NiCo2O4/ATP界面的形成以及生成丰富的氧空位,其作为吸附活化中心,将吸收的O2分子转化为活性氧物种,从而促进甲苯的降解。1∶5 NiCo2O4/ATP催化剂在初始浓度500×10-6下实现了82%的甲苯降解。这项工作为低成本高效率的VOCs光热催化降解提供了一种新策略。
The continuous emission of volatile organic compounds (VOCs) not only leads to serious environmental problems but also poses a significant threat to human health.Photothermal catalytic oxidation of VOCs is considered as a green and sustainable technology.Therefore,excellent catalysts are needed to efficiently utilize solar energy and drive catalytic reactions.In this work,NiCo2O4/attapulgite(ATP) composite was synthesized using ATP as support through an sol-gel method.The presence of Ni ions changed the charge transfer mechanism and interacted with Co ions through capturing excited electrons,thereby generating excellent light absorption capacity.Under light irradiation,the 1∶5 NiCo2O4/ATP catalyst absorbed visible and infrared light,induced lattice vibrations,and ultimately converted photon energy into heat,alllowing it to achieve excellent photothermal conversion performance (195.6℃) without additional heating.The introduction of ATP promoted the formation of an efficient NiCo2O4/ATP interface and generated abundant oxygen vacancies that acted as adsorption activation centers to convert absorbed O2 molecules into reactive oxygen species,thereby promoting the degradation of toluene.The 1∶5 NiCo2O4/ATP catalyst achieved 82% toluene degradation at an initial concentration of 500×10-6.This work provides a new strategy for cost-effective photothermal degradation of VOCs.
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