高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (6): 1881.doi: 10.7503/cjcu20200831

• 物理化学 • 上一篇    下一篇

钴掺杂锰酸镧光催化剂的第一性原理与可见光响应光催化性能研究

李义山1,2, 郭亮1,2(), 彭思凡1, 张庆茂1,2, 张瑜皓1,2, 徐诗淇1   

  1. 1.华南师范大学广东省微纳光子功能材料与器件重点实验室
    2.光学信息物理与技术国家重点实验室, 广州 510006
  • 收稿日期:2020-11-26 出版日期:2021-06-10 发布日期:2021-06-08
  • 通讯作者: 郭亮 E-mail:guoliangchn@163.com
  • 基金资助:
    广东省科技资助项目(2018B030323017);国家重点研发计划项目(2017YFB1104500);广东省科技计划重大项目(2020B090922006);广东省普通高校青年创新人才类项目(2018KQNCX057);华南师范大学青年学者基金(19KJ13);广东省教育厅特色创新工程(2019KTSCX034)

Cobalt Substitutions in Lanthanum Manganate Photocatalyst: First-principles and Visible-light Photocatalytic Ability Investigation

LI Yishan1,2, GUO Liang1,2(), PENG Sifan1, ZHANG Qingmao1,2, ZHANG Yuhao1,2, XU Shiqi1   

  1. 1.Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices
    2.State Key Laboratory of Optic Information Physics and Technologies,South China Normal University,Guangzhou 510006,China
  • Received:2020-11-26 Online:2021-06-10 Published:2021-06-08
  • Contact: GUO Liang E-mail:guoliangchn@163.com

摘要:

利用了第一性原理方法模拟计算了LaMnO3在掺杂Co前后的电子性质和光学性能, 计算结果表明, 掺杂Co可以提高LaMnO3对可见光的吸收能力. 探究了不同pH环境下采用溶胶-凝胶法制备的LaMnO3结构的稳定性, 多种表征手段的结果表明, LaMnO3在中性或碱性环境下较为稳定. 研究了不同Co掺杂浓度对LaMnO3光催化活性的影响. 其中, LaMn0.9Co0.1O3粉体表现出最高的光催化活性, 在可见光照射下对甲基橙溶液的降解率达54%, 比LaMnO3提高了17%.

关键词: 光催化, 钙钛矿, 第一性原理, 溶胶-凝胶法, 掺杂

Abstract:

Perovskite photocatalyst has attracted many attention due to its good stability and perfect catalytic decontamination ability. Sol-gel method can effectively and stably synthetize LaMnO3. Perovskite can effectively adjust the bandgap with substitute B site of metal and improve its catalytic performance. In this paper, The electronic and optical properties of LaMnO3 and the combination of LaMn1-xCoxO3 were simulated by the first principle method. The results showed that Co substitutions can improve the absorption ability to visible light of LaMnO3. LaMnO3 was synthetized by sol-gel method, and the stability of the structure under different pH environment was explored. The results showed that LaMnO3 was more stable under neutral or alkaline environment. The effect of LaMnO3 in different Co substitution concentration on the photocatalytic activity was studied. Among that, the results of experiment prove that the Co substitutions in LaMnO3 can improve the photocatalysis ability of LaMnO3. Compare with other proportion of Co substitutions, LaMn0.9Co0.1O3 powder showed the highest photocatalytic activity, and the degradation rate of methyl orange under visible light was 54%, which is 17% higher than that of LaMnO3.

Key words: Photocatalysis, Perovskite, First principle, Sol-gel method, Substitution

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