欢迎访问中国科学院大学学报,今天是

中国科学院大学学报 ›› 2023, Vol. 40 ›› Issue (6): 751-760.DOI: 10.7523/j.ucas.2022.005

• 地质与地球科学 • 上一篇    下一篇

CO2在高岭石(001)晶面吸附的第一性原理计算

梁家新1, 刘善琪1,2, 李永兵3   

  1. 1. 中山大学地球科学与工程学院, 广州 510275;
    2. 南方海洋科学与工程广东省实验室(珠海), 广东 珠海 519080;
    3. 中国科学院大学地球与行星科学学院 中国科学院计算地球动力学重点实验室, 北京 100049
  • 收稿日期:2021-10-07 修回日期:2022-01-10 发布日期:2022-01-13
  • 通讯作者: 刘善琪,E-mail:liushq8@mail.sysu.edu.cn
  • 基金资助:
    广州市基础与应用基础研究项目(202102020943)资助

First-principle calculations of CO2 adsorption on the kaolinite (001) surface

LIANG Jiaxin1, LIU Shanqi1,2, LI Yongbing3   

  1. 1. School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou 510275, China;
    2. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519080, Guangdong, China;
    3. CAS Key Laboratory of Computational Geodynamics, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2021-10-07 Revised:2022-01-10 Published:2022-01-13

摘要: 吸附是封存CO2的一种重要手段,也是降低CO2温室效应的一种有效途径。高岭石作为主要的黏土矿物,不仅具有较大的比表面积,而且分布广,封存CO2后不污染环境,是CO2的天然吸附剂。基于密度泛函理论的第一性原理计算CO2在高岭石(001)晶面的吸附,讨论吸附后的稳定构型、电子转移情况、密立根布居和分波态密度。结果表明在Top (1~3),Bridge (1~3)和Hollow (1~6)不同位点的吸附构型中,Hollow4-X构型最稳定,其吸附能为-0.41 eV。在Hollow4-X吸附构型中,CO2的O原子与晶面的H原子形成H—O键,其中CO2的O原子的2p轨道对成键贡献较大;高岭石(001)晶面H原子的电子转移到CO2的O原子上。

关键词: 吸附, 高岭石, 二氧化碳, 第一性原理计算

Abstract: Adsorption is an important means of storing CO2, and it is also an effective way to reduce the greenhouse effect caused by CO2. Kaolinite, the main clay mineral, is one of the potential media to adsorb CO2 due to its large specific surface area, wide distribution and no pollution after CO2 adsorption. In this paper, the first-principle calculations based on density functional theory were used to study the CO2 adsorption on the kaolinite(001) surface. The stable configuration, electron transfer, Milliken population and partial density of states after adsorption are discussed. These results show that Hollow4-X is the most stable configuration with adsorption energy -0.41 eV in the adsorption configurations at different sites of Top(1-3), Bridge(1-3) and Hollow(1-6). In the stable adsorption configuration Hollow4-X, the hydrogen atom of the kaolinite(001) surface bonds with the oxygen atom of the CO2, which leads to the formation of H-O bond. Moreover, the 2p orbital of the oxygen atom of CO2 has a great contribution to the formation of H-O bond, and the electrons of the H atom of the kaolinite(001) surface transfer to the O atom of CO2. Our calculations illustrate the mechanism of CO2 adsorption on the kaolinite(001) surface from the atomic scale, and provide a basis for further research and utilization of kaolinite to store CO2.

Key words: adsorption, kaolinite, CO2, first-principle calculations

中图分类号: