空心二氧化钛掺杂铜提升光催化二氧化碳还原性能
收稿日期: 2023-05-30
网络出版日期: 2023-08-25
基金资助
国家自然科学基金面上项目(22275153)
Hollow Cu-doped TiO2 for enhancing photocatalytic CO2 reduction performance
Received date: 2023-05-30
Online published: 2023-08-25
光催化二氧化碳还原作为一种新兴绿色技术，有望同时解决能源危机和环境污染问题，因此近年来备受关注。TiO2是目前研究最广泛的光催化剂之一，但也存在光吸收范围有限、光生载流子快速复合等不足。通过高温热解Ti基MOF（金属有机框架）前驱体可以将Cu掺杂进空心结构的TiO2中。通过X射线衍射（XRD）、扫描电镜（SEM）和透射电镜（TEM）分析所制备的光催化剂的结构和形貌，并利用紫外可见漫反射光谱（UV-Vis DRS）和光致发光光谱（PL）探究构效关系。实验结果表明，Cu的掺杂可以增强光吸收能力，促进光生载流子分离，从而改善光催化CO2还原性能；当Cu掺杂质量分数为0.50%时催化剂性能最佳，CO和CH4的产量分别为6.3 μmol/g和1.6 μmol/g。
宋智佳 , 王岁岁 , 匡勤 . 空心二氧化钛掺杂铜提升光催化二氧化碳还原性能[J]. 无机盐工业, 2023 , 55(8) : 45 -50 . DOI: 10.19964/j.issn.1006-4990.2023-0295
Photocatalytic CO2 reduction， as a new green technology， is expected to simultaneously solve the energy crisis and environmental pollution problems，so it has attracted much attention in recent years.As one of the most widely studied photocatalysts， TiO2 still has the disadvantages of limited light absorption range and rapid recombination of photogenerated carriers.Cu can be doped into TiO2 with hollow structure by pyrolyzing Ti-based MOF（metal-organic framework） precursors.The structure and morphology of the as-prepared photocatalysts were analyzed by X-ray diffraction（XRD），scanning electron microscopy（SEM），and transmission electron microscopy（TEM）.In addition， the structure-activity relationship was investigated using UV-Visible diffuse reflection spectroscopy（UV-Vis DRS） and photoluminescence spectroscopy（PL）.The experimental results revealed that Cu doping could improve the light absorption capacity and promote the separation of photogenerated carries， thereby improving the performance in photocatalytic CO2 reduction.When Cu doping mass fraction was 0.50%，the catalyst exhibited the best performance，and the yield of CO and CH4 reached 6.3 μmol/g and 1.6 μmol/g， respectively.
Key words： photocatalysis; CO2 reduction; Cu-doped hollow TiO2
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