g-C_(3)N_(4)/TiO_(2)复合材料的制备及可见光催化降解硝基苯

Preparation of g-C_(3)N_(4)/TiO_(2)Composite and Visible Light Catalytic Degradation of Nitrobenzene

采用原位合成法在TiO_(2)纳米管上沉积g-C_(3)N_(4)对材料进行改性,通过改变尿素的质量浓度制备了一系列不同负载量的g-C_(3)N_(4)/TiO_(2)复合材料(0.2、0.3、0.4、0.5、0.6 g·L^(-1)g-C_(3)N_(4)/TiO_(2)NTs),然后在可见光条件下考察了g-C_(3)N_(4)/TiO_(2)复合材料光催化降解硝基苯的性能,并对材料做了相关的表征分析和自由基清除实验。结果表明:将g-C_(3)N_(4)负载到TiO_(2)纳米管上可以显著提高光催化活性,可能是由于g-C_(3)N_(4)和TiO_(2)之间形成了异质结,延长了载流子的寿命,阻碍了电子与空穴的复合,从而提升了复合材料的光催化活性。

g-C_(3)N_(4)was deposited on TiO_(2)nanotubes by in-situ synthesis to modify the material.A series of g-C_(3)N_(4)/TiO_(2)composites with different loading amounts(0.2,0.3,0.4,0.5,0.6 g·L^(-1)g-C_(3)N_(4)/TiO_(2)NTs)were prepared by changing the mass concentration of urea.Then,the photocatalytic degradation performance of g-C_(3)N_(4)/TiO_(2)composite materials for nitrobenzene was investigated under visible light conditions,and related characterization analysis and free radical scavenging experiments were conducted on the materials.The final test results showed that the photocatalytic activity could be significantly improved by loading g-C_(3)N_(4)onto titanium dioxide nanotubes.It may be due to the formation of heterojunction between g-C_(3)N_(4)and titanium dioxide,which prolongs the life of the carrier and hinders the recombination of electrons and holes,improving the photocatalytic activity of the composite.