水泥基硼掺杂石墨相氮化碳降解NO

Cement-based boron-doped graphite phase carbon nitride material degrades NO

通过对石墨相氮化碳(g-C_(3)N_(4))和氧化硼(B_(2)O_(3))进行高温煅烧制备硼元素掺杂改性石墨相氮化碳(BCN),对其微观结构、形貌和光学特性进行表征。再以多孔水泥混凝土为光催化剂载体,研究掺杂g-C_(3)N_(4)和BCN的水泥基材料的力学性能和光催化降解NO性能。结果表明,B元素的引入会增大g-C_(3)N_(4)比表面积,改善水泥基材料对可见光的吸收,对NO的降解率达到40.7%。当掺杂BCN的质量分数达到水泥的6%时,水泥混凝土的7d抗压强度和28d抗压强度均达到最佳,分别为8.25MPa和14.4MPa;在可见光照射条件下,7d和28d光催化降解性能均达到最佳,分别为47%和63%。

Boron doping modification graphite carbon nitride(BCN)was prepared by high temperature calcination of graphite carbon nitride(g-C_(3)N_(4))and boron oxide(B_(2)O_(3)),and its microstructure,morphology and optical properties were characterized.The mechanical properties and photocatalytic degradation of NO of cement-based materials doped with g-C_(3)N_(4)and BCN were studied by using porous cement concrete as photocatalyst carrier.The results showed that the introduction of B element increased the specific surface area of g-C_(3)N_(4)and improved the absorption of visible light.The degradation rate of NO reached 40.7%.When the content reached 6%of cement content,the 7d strength and 28d strength of cement concrete were the best as 8.25MPa and 14.4MPa,respectively.Under visible light conditions,the photocatalytic degradation performance of 7d and 28d were the best,which were 47%and 63%,respectively.