Synthesis of magnetic chromium substituted cobalt ferrite Co(CrxFe1–x)2O4 adsorbents for phosphate removal

Qui Anh Tran; Nhat Linh Tran; Dang Khoa Nguyen Anh; Quynh Nhu Le Thi; The Luan Nguyen; Huu Thinh Pham Nguyen; Anh Tien Nguyen; Quoc Thiet Nguyen; Tien Khoa Le

doi:10.17308/kcmf.2022.24/9852

Qui Anh Tran Faculty of Chemistry, University of Science, Ho Chi Minh city, Vietnam; Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam https://orcid.org/0000-0002-0365-8794
Nhat Linh Tran Faculty of Chemistry, University of Science, Ho Chi Minh city, Vietnam; Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam https://orcid.org/0000-0001-8527-1958
Dang Khoa Nguyen Anh Faculty of Chemistry, University of Science, Ho Chi Minh city, Vietnam; Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam https://orcid.org/0000-0002-0968-0968
Quynh Nhu Le Thi Faculty of Chemistry, University of Science, Ho Chi Minh city, Vietnam; Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam https://orcid.org/0000-0002-8081-5570
The Luan Nguyen Faculty of Chemistry, University of Science, Ho Chi Minh city, Vietnam; Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam https://orcid.org/0000-0001-6305-6878
Huu Thinh Pham Nguyen Faculty of Chemistry, University of Science, Ho Chi Minh city, Vietnam; Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam https://orcid.org/0000-0002-9308-5263
Anh Tien Nguyen Faculty of Chemistry, Ho Chi Minh City University of Education, Ho Chi Minh City, Vietnam https://orcid.org/0000-0002-4396-0349
Quoc Thiet Nguyen Institute of Applied Materials Science, Vietnam Academy of Science and Technology, 1B TL29 District 12, Ho Chi Minh City, Vietnam https://orcid.org/0000-0002-2218-9225
Tien Khoa Le Faculty of Chemistry, University of Science, Ho Chi Minh city, Vietnam; Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam https://orcid.org/0000-0003-0058-0298

DOI: https://doi.org/10.17308/kcmf.2022.24/9852

Keywords: Chromium substitution, Cobalt ferrite, Phosphate removal, Magnetic adsorbent, Surface Cr 3 content

Abstract

In this work, we aimed to prepare chromium substituted cobalt ferrite Co(Cr_xFe_1–x)₂O₄ powders by a simple coprecipitationannealing method with different Cr contents to create novel magnetic adsorbents for the removal of phosphate ions from water. The effects of Cr substitution on the crystal structure, phase composition, morphology, surface atomic composition, surface area and magnetic properties of our adsorbents were investigated by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Brunauer-Emmett-Teller nitrogen adsorption-desorption and vibrating sample magnetometry. According to the results, all our Co(Cr_xFe_1–x)₂O₄ samples exhibited higher phosphate adsorption than CoFe₂O₄ powder but their magnetic properties were reduced for increasing Cr substitution. Among them, the Co(Cr_0.25Fe_0.75)₂O₄ sample was found to be the most promising material since its magnetic properties are still high to allow it to be easily separated from the solution and its maximum P adsorption capacity (according to the Langmuir model) was estimated to be 4.84 times higher than CoFe₂O₄, which can be attributed to the presence of Cr³⁺ ions on the surface and the enhanced surface specific area of this substituted sample. Moreover, the adsorption data of Co(Cr_0.25Fe_0.75)₂O₄ sample also fitted well
to the pseudo second order kinetic model, revealing the adsorption rate constant of 0.87 mgP^–1s^–1, two times superior to CoFe₂O₄.

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Author Biographies

Qui Anh Tran, Faculty of Chemistry, University of Science, Ho Chi Minh city, Vietnam; Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam

4th year student, Faculty of Chemistry,
University of Science, Vietnam National University
(Ho Chi Minh City, Vietnam).

Nhat Linh Tran, Faculty of Chemistry, University of Science, Ho Chi Minh city, Vietnam; Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam

4th year student, Faculty of
Chemistry, University of Science, Vietnam National
University (Ho Chi Minh City, Vietnam).

Dang Khoa Nguyen Anh, Faculty of Chemistry, University of Science, Ho Chi Minh city, Vietnam; Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam

3rd year student, Faculty
of Chemistry, University of Science, Vietnam National
University (Ho Chi Minh City, Vietnam).

Quynh Nhu Le Thi, Faculty of Chemistry, University of Science, Ho Chi Minh city, Vietnam; Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam

3rd year student, Faculty of
Chemistry, University of Science, Vietnam National
University (Ho Chi Minh City, Vietnam).

The Luan Nguyen, Faculty of Chemistry, University of Science, Ho Chi Minh city, Vietnam; Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam

Master in Chemistry, Faculty of
Chemistry, University of Science, Vietnam National
University (Ho Chi Minh City, Vietnam).

Huu Thinh Pham Nguyen, Faculty of Chemistry, University of Science, Ho Chi Minh city, Vietnam; Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam

Master in Chemistry,
Faculty of Chemistry, University of Science, Vietnam
National University (Ho Chi Minh City, Vietnam).

Anh Tien Nguyen, Faculty of Chemistry, Ho Chi Minh City University of Education, Ho Chi Minh City, Vietnam

PhD in Chemistry, Chief of
Inorganic Chemistry Department, Ho Chi Minh City
University of Education (Ho Chi Minh City, Vietnam).

Quoc Thiet Nguyen, Institute of Applied Materials Science, Vietnam Academy of Science and Technology, 1B TL29 District 12, Ho Chi Minh City, Vietnam

PhD in Chemistry, Institute of
Applied Materials Science, Vietnam Academy of
Science and Technology (Ho Chi Minh City, Vietnam).

Tien Khoa Le, Faculty of Chemistry, University of Science, Ho Chi Minh city, Vietnam; Faculty of Chemistry, University of Science, Vietnam National University, Ho Chi Minh City, Vietnam

PhD in Chemistry, Chief of Inorganic
Chemistry Department, University of Science, Vietnam
National University (Ho Chi Minh City, Vietnam).

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