Novel Nano-Fe2O3-Co3O4 Modified Dolomite and Its Use as Highly Efficient Catalyst in the Ozonation of Ammonium Solution

Joint Authors

Le, Giang H.
Vu, Tuan A.
Nguyen, Trinh Duy
Pham, Trang T. T.
Quan, Trang T. T.
Nguyen, Manh B.
Pham, Giang T. T.

Source

Journal of Nanomaterials

Issue

Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-11, 11 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2020-08-01

Country of Publication

Egypt

No. of Pages

11

Main Subjects

Chemistry
Civil Engineering

Abstract EN

Catalytic ozonation is a new method used for removal of NH4OH solution.

Therefore, high catalytic performance (activity and selectivity) should be achieved.

In this work, we report the synthesis and catalytic performance of Fe2O3-Co3O4 modified dolomite in the catalytic ozonation of NH4OH solution.

Dolomite was successfully activated and modified with Fe2O3 and Co3O4.

Firstly, dolomite was activated by heating at 800°C for 3 h and followed by KOH treatment.

Activated dolomite was modified with Fe2O3 by the atomic implantation method using FeCl3 as Fe source.

Fe2O3 modified dolomite was further modified with Co3O4 by precipitation method.

The obtained catalysts were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), N2 adsorption–desorption (BET), and temperature-programmed reduction (H2-TPR).

From SEM image, it was revealed that nano-Fe2O3 and Co3O4 particles with the size of 80–120 nm.

Catalytic performance of activated dolomite, Fe2O3 modified dolomite, and Fe2O3-Co3O4 modified dolomite in catalytic ozonation of NH4+ solution was investigated and evaluated.

Among 3 tested catalysts, Fe2O3-Co3O4 modified dolomite has the highest NH4+ conversion (96%) and N2 selectivity (77.82%).

Selectivity toward N2 over the catalyst was explained on the basis of bond strength M-O in oxides through the standard enthalpy ΔH°f of oxide.

Catalyst with lower ΔH°f value has higher N2 selectivity and the order is the following: Co3O4 (ΔH°f of 60 kcal (mole O)) > Fe2O3 (ΔH°f of 70 kcal (mole O)) > MgO (ΔH°f of 170 kcal (mole O)).

Moreover, high reduction ability of Fe2O3-Co3O4 modified dolomite could improve the N2 selectivity by the reduction of NO3- to N2 gas.

American Psychological Association (APA)

Nguyen, Manh B.& Le, Giang H.& Pham, Trang T. T.& Pham, Giang T. T.& Quan, Trang T. T.& Nguyen, Trinh Duy…[et al.]. 2020. Novel Nano-Fe2O3-Co3O4 Modified Dolomite and Its Use as Highly Efficient Catalyst in the Ozonation of Ammonium Solution. Journal of Nanomaterials،Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1188435

Modern Language Association (MLA)

Nguyen, Manh B.…[et al.]. Novel Nano-Fe2O3-Co3O4 Modified Dolomite and Its Use as Highly Efficient Catalyst in the Ozonation of Ammonium Solution. Journal of Nanomaterials No. 2020 (2020), pp.1-11.
https://search.emarefa.net/detail/BIM-1188435

American Medical Association (AMA)

Nguyen, Manh B.& Le, Giang H.& Pham, Trang T. T.& Pham, Giang T. T.& Quan, Trang T. T.& Nguyen, Trinh Duy…[et al.]. Novel Nano-Fe2O3-Co3O4 Modified Dolomite and Its Use as Highly Efficient Catalyst in the Ozonation of Ammonium Solution. Journal of Nanomaterials. 2020. Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1188435

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1188435