摘要
开展了石墨烯修饰二氧化钛纳米管(TNTA)对光催化还原CO2性能影响的实验研究。首先通过热蒸汽法还原氧化石墨烯,并在TNTA表面修饰石墨烯(RGO)制备出RGO-TNTA复合催化剂,分别研究了紫外光和可见光下不同氧化石墨烯质量浓度、不同光照强度和不同CO2体积流量下光催化还原CO2的产物产量。实验结果表明:不论是在紫外光下还是在可见光下,CO2转化产物主要为甲醇;RGO-TNTA在紫外光下和可见光下的光催化性能分别是未修饰的TNTA的1.26倍和2.22倍,最佳氧化石墨烯质量浓度分别为0.2mg·mL-1和0.3 mg·mL-1,甲醇产量最高为302.40 nmol·cm-2·h-1(约565.70μmol·(g-cat·h)-1)和198.51 nmol·cm-2·h-1(约371.36μmol·(g-cat·h)-1)。RGO-TNTA在紫外光和可见光下都大幅度提升了光催化还原CO2的性能。
An experimental study on the effect of graphene-modified titanium dioxide nanotubes(TNTA)on the performance of photocatalytic reduction of CO2 was carried out..Effect of different GO concentrations,light sources,illumination intensities and volume flow velocities of CO2 on photocatalytic reduction performance of CO2 was respectively investigated.The experimental results showed that the main product was methanol both under visible light and ultraviolet light;Photocatalytic performance of the RGO-TNTA composite catalyst under ultraviolet light and visible light respectively were 1.26 times and 2.22 times that of unmodified TNTA.The highest yields were up to 302.40 nmol·cm-2·h-1(about 565.70μmol·(g-cat·h)-1)and 198.51 nmol·cm-2·h-1(about 371.36μmol·(g-cat·h)-1)under ultraviolet light and visible light when the GO concentrations were 0.2 mg·mL-1 and 0.3 mg·mL-1,respectively.The performance of the photocatalytic reduction of CO2 was greatly enhanced after modifying TNTA with RGO.
作者
周心
ZHOU Xin(College of Chemistry and Chemical Engineering,Northeast Petroleum University,Daqing 163318,China)
出处
《当代化工》
CAS
2020年第11期2446-2451,共6页
Contemporary Chemical Industry
