氮化硼复合碳纤维的制备和研究

Preparation and Study of Boron Nitride Composite Carbon Fiber

以硼酸和尿素为原料,按照摩尔比为1∶1,1∶2,1∶3,再以乙醇为溶剂制备中间产物,在无氧的条件下800℃煅烧,制得氮化硼样品,然后以不同氮化硼样品与聚乙烯醇制成前驱体,再将其与碳纤维复合,在350℃氮气保护下煅烧得到样品C_(1),C_(2),C_(3)。利用XRD检测样品晶格结构,SEM观察样品表面的微观结构,FIRT考查样品中官能团以及官能团的变化,比较氮化硼样品与标准氮化硼PDF-15-0726基本一致,可知氮化硼制备效果较好,当尿素和硼酸摩尔比为1∶2时,原料利用率高,结晶性好。高温热解制得的BCN材料实现了h-BN和碳材料的有效结合。红外光谱图能看到特征官能团峰强明显,扫描电镜的样品表面复合效果一般;通过氮化硼复合碳纤维降解亚甲基蓝废水进行样品的性能测定。实验表明,尿素和硼酸摩尔比为1∶2时样品光催化降解亚甲基蓝效果最好,260 min后基本不降解,降解率为94.58%,对于环境废水的治理具有积极意义。

With boronic acid and urea as raw material,according to the molar ratio of 1∶1,1∶2,1∶3,then with ethanol as solvent to prepare intermediates,calcination at 800℃without oxygen,and then with different boron nitride samples and polyvinyl alcohol into precursor,and then combined with carbon fiber,calcination under 350℃nitrogen protection to samples C_(1),C_(2),C_(3).Using XRD detection sample lattice structure,SEM to observe the sample surface microstructure,FIRT in the change of functional groups and functional groups,compare the boron nitride samples and standard boron nitride PDF-15-0726,know the effect of boron nitride preparation is good,boronic acid and urea molar ratio of 2∶1,the raw material utilization rate is high,good crystallization.The BCN material produced by high temperature pyrolysis realizes the effective combination of h-BN and carbon material infrared spectroscopy can see the characteristic functional peak strength is obvious,the sample surface composite effect of the SEM is general,the sample performance degraded methylene blue wastewater by boron N composite carbon fiber,the molar ratio of 1∶2 sample photocatalytic methylene blue has the best effect,basically no degradation after 260 min,and the degradation rate is 94.58%,the visible boron nitride composite carbon fiber has positive significance for the treatment of environmental wastewater.