g-C3N4光催化混凝土对NO降解性能研究

研究了不同制备工艺及掺量的石墨相氮化碳(g-C₃N₄)对混凝土的力学性能及对NO气体光催化降解性能的影响及变化规律。通过TEM、SEM、XRD分别对材料的物相及微观结构进行了表征,利用微机控制全自动压力试验机和氮氧化物分析仪分别研究了掺g-C₃N₄后混凝土的抗压强度及对NO的降解性能。结果表明,四种不同种类的g-C₃N₄掺入后混凝土都具有对NO的降解作用,其中,少层g-C₃N₄的降解率最高,且在紫外线等照射24 h后其仍能保持较高的降解率;g-C₃N₄掺量不超过0.8%时混凝土的抗压强度不会有太大影响,在此范围内尽可能提高g-C₃N₄的掺量来提高其对NO的降解作用。

Photocatalytic Concrete Loaded with g-C3N4 and Its Degradation Performance of NO

The effects of different preparation technology and amount of graphite phase carbon nitride(g-C₃N₄)on the mechanical properties of the concrete and photocatalytic degradation of NO gas were studied.The phase and microstructure of the materials were characterized by TEM,SEM and XRD.The compressive strength and NO degradation of the concrete with g-C₃N₄ were studied by means of a microcomputer controlled automatic pressure tester and a nitrogen oxide analyzer.The results show that four kinds of g-C₃N₄ added in concrete have obvious degradation effect on NO,among which the degradation rate of a few layers g-C₃N₄ is the highest,and it can still maintain a high degradation rate 24 h after UV irradiation.The compressive strength of concrete will not be greatly affected when the amount of g-C₃N₄ does not exceed 0.8%,and the adding g-C₃N₄ can be improved as much as possible in this range to improve the degradation of NO.