开发可持续绿色能源和大气中CO2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-C3N4通过两步超声-煅烧的方法形成超薄纳米片CNN,与NaBH4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 CO2 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CO2的性能,当煅烧温度为500℃时还原性能最佳,CO产率为328.9 μmol·g-1,CH4产率达到148.4 μmol·g-1,同时表现出良好的循环稳定性.
Construction of Conductive Two-dimensional MOF@Carbon and Nitrogen Heterojunctions to Improve Photocatalytic CO2 Reduction Performance
The development of sustainable green energy and the rise of CO2 concentration in the atmosphere have been long-standing challenges,and photocatalytic technology has become the key to solving this problem.g-C3N4 was formed into ultra-thin nanosheet CNN by two-step ultrasonic-calcination method,and then treated with NaBH4 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℃),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 CO2,and the reduction performance was the best when the calcination temperature was 500 ℃,the yield of CO was 328.9 μmol·g-1,and the yield of CH4 reached 148.4μmol·g-1,and it showed good cycle stability.
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