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

doi:10.1016/j.cjche.2020.09.010

Chinese Journal of Chemical Engineering ›› 2021, Vol. 33 ›› Issue (5): 147-159.DOI: 10.1016/j.cjche.2020.09.010

• Catalysis, Kinetics and Reaction Engineering • Previous Articles Next Articles

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 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:2021-08-19 Published:2021-05-28
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.

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 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

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.

Abstract

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

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

Aisha Kanwal, Shamaila Sajjad, Sajjad Ahmed Khan Leghari, Muhammad Naeem Khan. Strong interfacial charge transfer between hausmannite manganese oxide and alumina for efficient photocatalysis[J]. Chinese Journal of Chemical Engineering, 2021, 33(5): 147-159.

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

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

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