钴掺杂聚合氮化碳光催化还原二氧化碳性能研究

doi:10.19964/j.issn.1006-4990.2022-0222

摘要/Abstract

摘要：

聚合氮化碳（CN）具有可见光响应、化学性质稳定、廉价易得、无毒等优点，在光催化领域得到了广泛的研究和应用，但是存在比表面积较小、电子-空穴对易复合等不足之处，严重限制了其光催化性能。以尿素和常见的两种钴盐[CoCl₂和Co（NO₃）₂]为前驱体，通过一步煅烧法制备了钴（Co）掺杂CN，研究了不同Co源对材料光催化还原二氧化碳（CO₂）性能的影响。实验证明，由适量氯化钴（CoCl₂）为Co源得到的Co掺杂CN，其光催化还原CO₂生成一氧化碳（CO）的速率可由纯CN的82.7 μmol/（g·h）提升至374.5 μmol/（g·h），同时CO选择性由79.1%提高至88.5%；而以硝酸钴[Co（NO₃）₂]为Co源得到的Co掺杂CN倾向于产氢，其光催化还原CO₂性能基本不能得到提升。通过对光催化剂进行电感耦合等离子体（ICP）、X射线衍射（XRD）、傅里叶红外光谱（FT-IR）、X射线光电子能谱（XPS）、紫外-可见漫反射光谱（UV-Vis DRS）、扫描电镜（SEM）、物理吸附和光电化学测试等表征，分析了材料的结构以及光催化性能提升的原因。

关键词: 聚合氮化碳, 金属掺杂, 光催化, 二氧化碳还原

Abstract:

Polymeric carbon nitride（CN） has been widely studied and applied in the field of photocatalysis benefiting from its visible light response，high chemical stability，low cost，easy preparation and non-toxicity.However，its shortcomings，such as small specific surface area and easy recombination of electron-hole pairs，seriously limit its photocatalytic performance.Co doped CN was prepared by one-step calcination of urea and two widely used cobalt salts[CoCl₂and Co（NO₃）₂] as precursors，and the effects of different Co sources on the photocatalytic CO₂ reduction performance of the products were studied.The results showed that the photocatalytic CO₂ reduction performance of CN doped with appropriate amount of Co by using CoCl₂as Co source was improved.The CO generation rate was increased from 82.7 μmol/（g·h）for pure CN to 374.5 μmol/（g·h），and the CO selectivity was increased from 79.1% to 88.5%.By contrast，Co doped CN using Co（NO₃）₂ as Co source was tended to produce hydrogen，and its photocatalytic CO₂ reduction performance was not improved.The photocatalysts were characterized by inductively coupled plasma（ICP），X-ray diffraction（XRD），fourier infrared spectroscopy（FT-IR），X-ray photoelectron spectroscopy（XPS），UV-Vis diffusion reflection spectroscopy（UV-Vis DRS），scanning electron microscopy（SEM），physical adsorption，photoelectrochemical test and etc.，and the material structure and the reasons for the improvement of the photocatalytic performance were analyzed.

Key words: polymeric carbon nitride, metal doping, photocatalysis, carbon dioxide reduction

中图分类号:

O643.3

李佳慧,王欢,李克艳,郭新闻. 钴掺杂聚合氮化碳光催化还原二氧化碳性能研究[J]. 无机盐工业, 2022, 54(11): 124-130.

LI Jiahui,WANG Huan,LI Keyan,GUO Xinwen. Study on photocatalytic CO₂ reduction performance of Co doped polymeric carbon nitride[J]. Inorganic Chemicals Industry, 2022, 54(11): 124-130.

图/表 7

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