Photo-assisted selective catalytic reduction (photo-SCR) has been recognized as a promising strategy for NO_x removal in recent decade, however rational designing of efficient and low-cost catalyst for photo-SCR remains to be a challenge. In the present work, natural one-dimension attapulgite (ATP) clay was initially coated with perovskite oxides by sol–gel method, and then coupled with reduced graphene oxide (rGO) by electrostatic assembly. XRD, TEM, Raman, UV–Vis, XPS, NH₃-TPD, H₂-TPR and in situ EPR were employed to characterize the products. Results indicated that the framework was coherently integrated by ATP skeleton, LaCoO₃ particles and rGO nanosheet, while rGO behaved as excellent electronic transmission mediator between ATP and LaCoO₃ to achieve indirect Z-scheme system, thus significantly improved the charge-separation efficiency and redox ability of the nanocomposite. In situ EPR revealed that the photogenerated holes in the catalysts were captured by NH₃ to produce NH₂ radical, which produced NH₂NO intermediate followed by decomposing into N₂ and H₂O. Photo-SCR of NO was performed using LaCoO₃/ATP/rGO as catalyst under simulated solar-light irradiation. Results indicated that the introduction amount of rGO had critical effect on the NO conversion efficiency, which reached as high as 95% conversion rate and 100% N₂ selectivity even under room temperature when the mass content of rGO was optimized to 0.6 wt%. In addition, SO₂ and H₂O tolerance experiment did not find noticeable deactivation of the obtained Z-scheme photocatalyst, which was attributed to the synergistic resistance effect between ATP and rGO.

光辅助的选择性催化还原（照片-SCR）已被确认为一个有前途的战略NO _X在最近十年中去除，用于光SCR高效和低成本的催化剂但是理性的设计仍然是一个挑战。在目前的工作中，天然一维凹凸棒石（ATP）粘土首先通过溶胶-凝胶法涂覆钙钛矿氧​​化物，然后通过静电组装与还原型氧化石墨烯（rGO）偶联。用XRD，TEM，拉曼，UV-Vis，XPS，NH ₃ -TPD，H ₂ -TPR和原位EPR表征产物。结果表明该框架是由ATP骨架LaCoO ₃紧密集成的。颗粒和rGO纳米片，而rGO充当ATP和LaCoO ₃之间的优良电子传输介质，以实现间接Z方案系统，从而显着提高了纳米复合材料的电荷分离效率和氧化还原能力。原位EPR透露，在催化剂中的光生空穴由NH捕获₃以产生NH ₂基团，NH其产生₂ NO中间体接着分解成Ñ ₂和H ₂ NO的O.照片-SCR使用LaCoO进行₃/ ATP / rGO在模拟太阳光照射下作为催化剂。结果表明，rGO的引入量对NO的转化效率有关键影响，当将rGO的质量含量优化为0.6 wt％时，即使在室温下，rGO的转化率也高达95％，N ₂选择性高达100 ％。另外，对SO ₂和H ₂ O的耐受性实验未发现所获得的Z型光催化剂有明显的失活，这归因于ATP和rGO之间的协同抗性效应。