硝酸改性石墨相碳化氮光催化降解偏二甲肼废水

Photocatalytic degradation of unsymmetric dimethyl hydrazine waste water by nitric acid modified g-C_3N_4

以三聚氰胺为前驱体直接热聚合制备石墨相碳化氮(g-C_3N_4),利用浓硝酸进行刻蚀,获得硝酸改性g-C_3N_4。采用扫描电子显微镜(SEM)、X射线能谱(EDS)、X射线衍射(XRD)、N_2吸附/脱附、傅立叶变换红外光谱(FT-IR)进行表征,并在紫外光下进行了偏二甲肼废水降解实验。结果表明,硝酸改性后,g-C_3N_4微观形貌发生改变,比表面积明显增大。相比未改性g-C_3N_4,硝酸改性g-C_3N_4光反应100min后对偏二甲肼去除率提升了24百分点,光反应180min后对总有机碳去除率提升了13百分点。

In this experiment,melamine was selected as the precursor of bulk graphite-phase carbon nitride(g-C3N4)via direct thermal polymerization method,when preparation of nitric acid modified g-C3N4 by bulk g-C3N4 using nitric acid etching.Scanning electron microscopy,X-ray spectrum,X-ray diffraction,nitrogen adsorption/desorption and Fourier-transform infrared spectroscopy analysis techniques were used to analyze the samples,meanwhile,the nitric acid modified g-C 3N 4 was used to degrade unsymmetric dimethyl hydrazine waste water under ultraviolet light.The results showed that microtopography of sample was textured and specific surface area was improved significantly after modification.Compared with unmodified g-C3N4,the unsymmetric dimethyl hydrazine removal efficiency of nitric acid modified g-C3N4 was improved by 24 percentage points after 100 min photoreaction,and removal efficiency of total organic carbon was improved by 13 percentage points after 180 min photoreaction.