摘要
采用溶胶-凝胶法和超声分散法制备了TiO_(2)-CNTs复合光催化剂,并进行了光催化还原CO_(2)活性测试。结果表明,当CNTs负载量为0.75%时,TiO_(2)-CNTs复合光催化剂光催化还原CO_(2)的性能较佳,在波长365 nm的紫外光照射下,相比于单一TiO_(2)催化剂,CH_(4)平均产率提升了90%,CO平均产率提升了156%。反应机理认为:CNTs作为助催化剂与半导体TiO_(2)形成了紧密的电子传输结构,显著加快了光生载流子的转移,降低了电子-空穴的复合效率;此外,CNTs高比表面积和优异的吸附性能可以增加反应活性位点,从而提高催化剂光催化还原CO_(2)效率。
A composite photocatalyst of TiO_(2)-CNTs was synthesized by adopting the sol-gel method and ultrasonic dispersion,and then its activity in the photocatalytic reduction of CO_(2) was tested.With a load capacity of carbon nanotubes(CNTs) at 0.75%,the TiO_2-CNTs present a better performance in photocatalytic CO_(2) reduction.Under UV irradiation with wavelength of 365 nm,the average yield of CH_(4) and CO from the composite catalyst are enhanced by 90% and 156% respectively,compared to the usage of single TiO_(2) catalyst.It is believed that the reaction is based on the following mechanisms:CNTs,as a co-catalyst,forms a compact electron transport structure with semiconductor of TiO_(2),which significantly accelerates the transfer of photogenic carriers and reduces the electron-cave recombination efficiency.In addition,high specific surface area and excellent adsorption performance of CNTs can increase active sites for reaction,thus improving efficiency of photocatalytic reduction of CO_(2) by the catalyst.
作者
张瀚文
习小明
卓晓军
沈裕军
周小舟
彭俊
ZHANG Hanwen;XI Xiaoming;ZHUO Xiaojun;SHEN Yujun;ZHOU Xiaozhou;PENG Jun(Changsha Research Institute of Mining and Metallurgy Co.,Ltd.,Changsha 410012,Hunan,China;School of Metallurgy and Environmental Engineering,Central South University,Changsha 410083,Hunan,China)
出处
《矿冶工程》
CAS
北大核心
2024年第6期151-155,162,共6页
Mining and Metallurgical Engineering
基金
南岭钨锡钼铋资源综合开发与精深加工利用集成示范(2022YFC2905105-3/5)。
