[1] Huang Bangfu, Shi Zhe, Cai Ming, Yu Anhe, et al. Mechanism of coconut husk activated carbon modified by Mn(NO3)2 [J]. Journal of Southeast University (English Edition), 2020, 36 (4): 475-482. [doi:10.3969/j.issn.1003-7985.2020.04.013]

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Mechanism of coconut husk activated carbon modified by Mn(NO₃)₂()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

36

Issue:

2020 4

Page:

475-482

Research Field:

Chemistry and Chemical Engineering

Publishing date:

2020-12-20

Info

Title:

Mechanism of coconut husk activated carbon modified by Mn(NO₃)₂

Author(s):

Huang Bangfu;  Shi Zhe;  Cai Ming;  Yu Anhe

Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
Clean Metallurgy Key Laboratory of Complex Iron Resources of the University in Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China

Keywords:

HNO₃;  Mn(NO₃)₂;  coconut husk activated carbon;  physicochemical property;  modification mechanism

PACS:

TQ520

DOI:

10.3969/j.issn.1003-7985.2020.04.013

Abstract:

To study the mechanism by which activated carbon is modified by HNO₃ and Mn(NO₃)₂, the pore texture and surface chemical characteristics of carbon materials in coconut husk activated carbon(AC)were examined via scanning electron microscopy(SEM), Brunauer-Emmett-Teller(BET), X-ray diffraction(XRD), Fourier-transform infrared spectroscopy(FTIR), and X-ray photoelectron spectroscopy(XPS). After being modified by HNO₃, the millipore character of AC became deformed, and the character of the adjacent pores remained consolidated. The surface manganites of Mn/AC-1 presented as block and reticular fiber structures, Mn/AC-2’s surface manganites presented as petty mammock crystals, and Mn/AC-3’s surface manganites were observed as gauze nanosheets that interlace to fill in the pore canal. Nitric acid modification was shown to enlarge surface pores but decrease the specific surface area of AC. Mn loading can be used to construct a new pore structure that, in turn, increased the total specific surface area as well as the specific surface area and the volume of the millipores. Mn/AC-2’s pore structure was optimized at a calcination temperature of 500 ℃ and a loading quantity of 5%. The ash content of AC was considerably reduced after modified by HNO₃. The active materials for Mn/AC-1 mainly consisted of Mn₃O₄, with a few Mn₂O₃ crystals, whereas Mn/AC-2’s materials were mainly Mn₃O₄ and some MnO crystals. Mn/AC-3 was exclusively composed of Mn₃O₄. HNO₃ activation and Mn loading modification did not considerably affect the functional group species present on the catalyst. Modification conditions using the same loading quantities and higher calcination temperatures decreased the number of O—H and N—H bonds while conversely increasing the number of CC and C—O bonds. On the contrary, the use of a higher loading quantity while maintaining the same calcination temperature increased the number of O—H and N—H bonds. A higher loading quantity is beneficial for increasing Mn⁴⁺ species. A higher calcination temperature is beneficial for increasing Mn³⁺ species. The results can optimize the conditions under which Mn/AC catalyst modification occurs, thus improving the physical and chemical properties of carbon-based sorbents.

References:

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Memo

Memo:

Biography: Huang Bangfu(1983—), male, doctor, associate professor, kmusthbf@163.com.
Foundation items: The Science and Technology Plan of Yunnan Science and Technology Department(No.2019FB077, 202001AT070029), the Open Fund of Key Laboratory of Ministry of Education for Metallurgical Emission Reduction and Comprehensive Utilization of Resources(No.JKF19-08), the Industrialization Cultivation Project of Scientific Research Fund of Yunnan Provincial Department of Education(No.2016CYH07).
Citation: Huang Bangfu, Shi Zhe, Cai Ming, et al. Mechanism of coconut husk activated carbon modified by Mn(NO₃)₂[J].Journal of Southeast University(English Edition), 2020, 36(4):475-482.DOI:10.3969/j.issn.1003-7985.2020.04.013.

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