TiO_(2)/g-C_(3)N_(4)复合材料的制备及其紫外光催化降解罗丹明B  

Preparation and Its UV Photocatalytic Degradation of Rhodamine B of TiO_(2)/g-C_(3)N_(4) Composites

作　　者：吴磊 安智晖 朱艳 苏康杰 樊静 贾仕奎 WU Lei;AN Zhihui;ZHU Yan;SU Kangjie;FAN Jing;JIA Shikui(School of Materials Science and Engineering,National&Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology,Shaanxi University of Technology,Hanzhong 723000,China)

机构地区：[1]陕西理工大学材料科学与工程学院,矿渣综合利用环保技术国家地方联合工程实验室,陕西汉中723000

出　　处：《水处理技术》2025年第1期47-52,共6页Technology of Water Treatment

基　　金：国家级大学生创新创业训练计划项目(202310720030);陕西理工大学校级科研重点项目(SLGKYXM2305)。

摘　　要：采用溶胶凝胶-高温煅烧法制备二氧化钛(TiO_(2)),高温煅烧法制备石墨相氮化碳(g-C_(3)N_(4)),再将不同质量份数比的TiO_(2)和g-C_(3)N_(4)粉末充分球磨后煅烧获得TiO_(2)/g-C_(3)N_(4)复合材料。通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)、X射线光电子能谱(XPS)、荧光光谱分析和紫外-可见光谱仪对TiO_(2)/g-C_(3)N_(4)复合材料的微观结构、晶体结构、化学键结构、荧光强度和吸光度进行分析,并给出了TiO_(2)/g-C_(3)N_(4)对罗丹明B的紫外光催化机理。结果表明,在250 W紫外光照射下,光照时长为150 min时,罗丹明B在纯g-C_(3)N_(4)作用下的降解率为79.95%,其在纯TiO_(2)中的降解率仅为70.52%;而质量份数比为1:3的TiO_(2)/g-C_(3)N_(4)复合材料对罗丹明B的降解率可达到94.42%;在回收试验中,相同的紫外光照强度下,光照时长50 min时,质量份数比为1:2的TiO_(2)/g-C_(3)N_(4)复合材料回收5次时对罗丹明B的降解率为90.33%,回收10次其降解率仍达89.5%。Titanium dioxide(TiO_(2))was prepared by sol-gel-high-temperature calcination,and graphitic carbon nitride(g-C_(3)N_(4))was prepared by high-temperature calcination,and then TiO_(2)/g-C_(3)N_(4) composites were obtained by ball milling of TiO_(2) and g-C_(3)N_(4) powders with different component ratios.The microstructure,crystal structure,chemical bond structure,fluorescence intensity and absorbance of TiO_(2)/g-C_(3)N_(4) composites were studied by scanning electron microscopy(SEM),X-ray diffraction(XRD),fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),fluorescence spectroscopy and ultraviolet-visible spectroscopy,and the ultraviolet photocatalytic mechanism of TiO_(2)/g-C_(3)N_(4) on rhodamine B was given.The results show that under the condition of 250 W UV lamp for 150 min,the degradation rate of Rhodamine B within pure g-C_(3)N_(4) and TiO_(2) is 79.95%and 70.52%,respectively,while the degradation rate of Rhodamine B within the TiO_(2)/g-C_(3)N_(4) composites with a weight component ratio of 1:3 can reach 94.42%.In the recovery test,the degradation rate of TiO_(2)/g-C_(3)N_(4) composites with a weight component ratio of 1:2 at 50 min is 90.33%when recovered five times,and the degradation rate is still 89.5%after ten recycling.

关 键 词：二氧化钛 石墨相氮化碳 光催化 回收 

分 类 号：TQ426.64[化学工程]