构建导电二维MOF@碳氮异质结提高光催化CO_(2)还原性能

Construction of Conductive Two-dimensional MOF@Carbon and Nitrogen Heterojunctions to Improve Photocatalytic CO_(2) Reduction Performance

开发可持续绿色能源和大气中CO_(2)浓度上升是长久以来面临的巨大挑战,光催化技术已成为解决这一问题的关键。将g-C_(3)N_(4)通过两步超声-煅烧的方法形成超薄纳米片CNN,与NaBH_(4)处理形成掺硼BDCNNX,通过静电自组装方法将BDCNNX与Ru@Cu-HHTP复合构建导电二维MOFs@碳氮晶体材料CNX/Ru@Cu-HHTP(X为煅烧温度,分别为400、425、450、500℃),重点探讨了复合光催化剂对光催化还原CO_(2)的性能。结果表明:CNX/Ru@Cu-HHTP异质结的构筑可以显著提高光催还原CO_(2)的性能,当煅烧温度为500℃时还原性能最佳,CO产率为328.9μmol·g^(-1),CH_(4)产率达到148.4μmol·g^(-1),同时表现出良好的循环稳定性。

The development of sustainable green energy and the rise of CO_(2) concentration in the atmosphere have been long-standing challenges,and photocatalytic technology has become the key to solving this problem.g-C_(3)N_(4) was formed into ultra-thin nanosheet CNN by two-step ultrasonic-calcination method,and then treated with NaBH_(4) to form boron-doped BDCNNx,and BDCNNx was combined with Ru@Cu-HHTP by electrostatic self-assembly method to construct conductive two-dimensional MOFs@carbon-nitrogen crystals material CNx/Ru@Cu-HHTP(where x represents the calcination temperature,of 400,425,450 or 500 C),and the effect of the composite photocatalyst on the photocatalytic reduction of CO2 was mainly discussed.The results showed that the construction of CNx/Ru@Cu-HHTP heterojunction could significantly improve the performance of photocatalytic reduction of CO_(2),and the reduction performance was the best when the calcination temperature was 500℃,the yield of CO was 328.9μmol g',and the yield of CH_(4) reached 148.4μmol·g^(-1),and it showed good cycle stability.