锰酸钴微球的制备及其光催化性能研究

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摘要随着世界经济的快速发展，人口数量的快速提升，人类活动的增多，这导致了人类对于各种能源的需求也越来越高。随之而来的环境问题也越来越受到人们的关注，而温室效应无疑是环境问题中备受人们关注的问题。如何解决这一问题将持续受到大家的关注。而经过研究，我们发现减少二氧化碳气体的排放量以及转化二氧化碳使其转变为其他可利用的有机物，对于减轻温室效应、推动经济和社会的可持续发展具有十分重要的作用。而这其中由于热光催化二氧化碳的环保性和简便性，热光催化还原CO2无疑为减少二氧化碳排放量提供了一个新的方向，这让众多科学家为之研究，从而得出一个能拯救人类生存环境的完美方案。70037

由于热光催化还原CO2的效率本质上由所应用的助催化剂决定，因此开发和开发高效和稳定的新助催化剂以催化CO2转化反应是具有重要的意义。本文阐述了锰酸钴微球的制备方法以及其光催化二氧化碳的性能。实验中采用水热处理前驱体制备锰酸钴微球，所得到的的锰酸钴微球一种尖晶石结构。实验利用XRD、BET和扫描（透射）电镜，发现制备出的锰酸钴呈现微球状，而不同锰钴含量比的制备的锰酸钴微球晶体各不同，当锰酸钴中钴的含量小于锰的含量时，我们得到的晶体为较为纯净的Co3O4四方晶系，反之，我们得到的晶体为较为纯净的Co2MnO4.5立方晶系；利用了热光催化还原CO2装置研究了不同钴锰含量比的锰酸钴微球对于光催化还原CO2的还原效率，表明所制备的锰酸钴微球均具有一定的催化效果，且在其他条件相同的情况下，在强光照条件下锰酸钴的催化性能优于自然光条件下，表明锰酸钴的催化性能受光照影响；利用了CS系列电化学工作站所测得的Mott-Schottky曲线和紫外-可见-红外吸收光谱确定了样品S37和S73的带隙能量分别为1.84eV和1.86eV，也确定了锰酸钴微球是n型半导体。经过这些测试，证明了锰酸钴微球具备催化性能，且制备方法简单，在热光催化还原CO2领域有很大的研究价值。

毕业论文关键字：尖晶石结构；锰酸钴；水热法；催化还原CO2；

Abstract

With the fast development of the world economy, the rapid increase of the population, the increase of the human activities, which led to the human demand for a variety of energy is also getting higher and higher. The environmental problems have been paid more and more attention, and the greenhouse effect is undoubtedly a matter of concern to the environmental problems. How to solve this problem will continue to be everyone's attention. After researching, we have found that reducing carbon dioxide emissions and converting carbon dioxide into other available organic compounds is a very important role in mitigating the greenhouse effect and promoting sustainable economic and social development. Which is due to the environmental protection and simplicity of photocatalytic carbon dioxide, photocatalytic reduction of CO2 is undoubtedly to reduce carbon dioxide emissions to provide a new direction, which allows many scientists to study, to come up with a living environment to save the perfect Program.

Since the efficiency of thermoelectric photocatalytic reduction of CO2 is essentially determined by the co-catalyst used, it is of great significance to develop and develop efficient and stable new cocatalysts to catalyze the CO2 conversion reaction. This paper describes the preparation of cobalt manganate microspheres and its photocatalytic performance of carbon dioxide. In the experiment, cobalt hydrobromide microspheres were prepared by hydrothermal treatment precursors, and the obtained cobalt manganate microspheres were prepared in a spinel structure. The results show that the prepared cobalt manganate is different from that of the cobalt manganate microspheres prepared by XRD, BET and scanning electron microscopy. Manganese content, we get the crystal is more pure Co3O4 tetragonal system, on the contrary, we get the crystal is relatively pure Co2MnO4.5 cubic crystal system; the use of hot-photocatalytic reduction of CO2 device to study the different cobalt-manganese content ratio The results show that the prepared cobalt manganate microspheres have a certain catalytic effect, and under the same conditions, under the condition of strong light conditions, the catalytic effect of cobalt oxide on the photocatalytic reduction of CO2 The results show that the catalytic properties of cobalt manganate are affected by light. The Mott-Schottky curves and UV-visible-infrared absorption spectra measured by CS series electrochemical workstations determine the band gap of S37 and S73 The energy was 1.84eV and 1.86eV, respectively, and the cobalt manganate microspheres were also identified as n-type semiconductors. After these tests, it is proved that the cobalt manganate microspheres have catalytic performance, and the preparation method is simple and has great research value in the field of photocatalytic reduction of CO2.