SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 33 ›› Issue (5): 147-159.DOI: 10.1016/j.cjche.2020.09.010

• Catalysis, Kinetics and Reaction Engineering • 上一篇    下一篇

Strong interfacial charge transfer between hausmannite manganese oxide and alumina for efficient photocatalysis

Aisha Kanwal1, Shamaila Sajjad1, Sajjad Ahmed Khan Leghari2, Muhammad Naeem Khan3   

  1. 1 International Islamic University, H-10 Islamabad, Pakistan;
    2 Pakistan Institute of Engineering and Applied Sciences, Islamabad 44000, Pakistan;
    3 Department of Chemistry, Government College of Science, Lahore, Pakistan
  • 收稿日期:2020-03-06 修回日期:2020-09-07 出版日期:2021-05-28 发布日期:2021-08-19
  • 通讯作者: Shamaila Sajjad
  • 基金资助:
    The work is acknowledged to H-10, Islamabad, Higher Education of Commission of Pakistan (NRPU Grant No. 3660), International Islamic University, H-10, Islamabad, and Pakistan Institute of Engineering and Applied Sciences. We are very much grateful to School of Environmental and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China, University of the Punjab Lahore, Government College University Lahore, National Centre of Physics, Institute of Space Technology and Allama Iqbal Open University Islamabad for analysis.

Strong interfacial charge transfer between hausmannite manganese oxide and alumina for efficient photocatalysis

Aisha Kanwal1, Shamaila Sajjad1, Sajjad Ahmed Khan Leghari2, Muhammad Naeem Khan3   

  1. 1 International Islamic University, H-10 Islamabad, Pakistan;
    2 Pakistan Institute of Engineering and Applied Sciences, Islamabad 44000, Pakistan;
    3 Department of Chemistry, Government College of Science, Lahore, Pakistan
  • Received:2020-03-06 Revised:2020-09-07 Online:2021-05-28 Published:2021-08-19
  • Contact: Shamaila Sajjad
  • Supported by:
    The work is acknowledged to H-10, Islamabad, Higher Education of Commission of Pakistan (NRPU Grant No. 3660), International Islamic University, H-10, Islamabad, and Pakistan Institute of Engineering and Applied Sciences. We are very much grateful to School of Environmental and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, China, University of the Punjab Lahore, Government College University Lahore, National Centre of Physics, Institute of Space Technology and Allama Iqbal Open University Islamabad for analysis.

摘要: Well crystalline manganese oxide (Mn3O4) nanoparticles anchored on gamma alumina (γ-Al2O3) have been successfully tailored via a proficient and cost effective chemical process as an efficient material for photo catalysis. XRD indicated the composite formation of γ-Al2O3 and hausmannite structure of Mn3O4. SEM and TEM revealed that hetero structure of Mn3O4/γ-Al2O3 exhibits an amalgam of aggregated nanoparticles and nanorods. XPS demonstrated the chemical states of binary nanocomposite. The band gap tuning has been performed with γ-Al2O3 nanoparticles by assimilating hausmannite Mn3O4 particles into flower like microstructure of Al2O3. The photoluminescence spectra affirmed the enhancement in charge separation in Mn3O4/γ-Al2O3 binary hybrid photocatalyst. The band gap becomes narrow with the increase in concentrations of Mn3O4. The narrowing of band gap is concorded with crystalline domains of primary aggregated particles. To elucidate the mechanism of the photocatalytic activity linear sweep voltammetry was performed. The results showed that Mn3O4/γ-Al2O3 nanocomposite revealed the enhancement in current density as compared to pure γ-Al2O3 which confirmed the electron transfer from Mn3O4 to γ-Al2O3 through the interfacial potential gradient in conduction bands. The optimum concentration of 6.0% Mn3O4/γ-Al2O3 for hybrid structure showed an excellent photocatalytic activity under visible light due to narrow band gap energy. High degree distribution of Mn3O4 nano architects overlying on γ-Al2O3 induces a significant synergic effect between γ-Al2O3 and hausmannite phase of manganese oxide (Mn3O4). This strong interfacial contact between γ-Al2O3 and Mn3O4 endures the quick transfer of photo generated charge carriers across interface.

关键词: Hausmannite Mn3O4, Alumina, Band gap tuning, Interfacial charge transfer, Nanomaterials, Catalysis

Abstract: Well crystalline manganese oxide (Mn3O4) nanoparticles anchored on gamma alumina (γ-Al2O3) have been successfully tailored via a proficient and cost effective chemical process as an efficient material for photo catalysis. XRD indicated the composite formation of γ-Al2O3 and hausmannite structure of Mn3O4. SEM and TEM revealed that hetero structure of Mn3O4/γ-Al2O3 exhibits an amalgam of aggregated nanoparticles and nanorods. XPS demonstrated the chemical states of binary nanocomposite. The band gap tuning has been performed with γ-Al2O3 nanoparticles by assimilating hausmannite Mn3O4 particles into flower like microstructure of Al2O3. The photoluminescence spectra affirmed the enhancement in charge separation in Mn3O4/γ-Al2O3 binary hybrid photocatalyst. The band gap becomes narrow with the increase in concentrations of Mn3O4. The narrowing of band gap is concorded with crystalline domains of primary aggregated particles. To elucidate the mechanism of the photocatalytic activity linear sweep voltammetry was performed. The results showed that Mn3O4/γ-Al2O3 nanocomposite revealed the enhancement in current density as compared to pure γ-Al2O3 which confirmed the electron transfer from Mn3O4 to γ-Al2O3 through the interfacial potential gradient in conduction bands. The optimum concentration of 6.0% Mn3O4/γ-Al2O3 for hybrid structure showed an excellent photocatalytic activity under visible light due to narrow band gap energy. High degree distribution of Mn3O4 nano architects overlying on γ-Al2O3 induces a significant synergic effect between γ-Al2O3 and hausmannite phase of manganese oxide (Mn3O4). This strong interfacial contact between γ-Al2O3 and Mn3O4 endures the quick transfer of photo generated charge carriers across interface.

Key words: Hausmannite Mn3O4, Alumina, Band gap tuning, Interfacial charge transfer, Nanomaterials, Catalysis