Environmentally Friendly and Facile Solid-State Synthesis of Nanostructured Cobalt Ferrites

Khoa Dang Nguyen; Khoa Dang Tran; Van Thi Tuong Pham; Ha Vu Le

doi:10.22146/ijc.99143

Environmentally Friendly and Facile Solid-State Synthesis of Nanostructured Cobalt Ferrites

https://doi.org/10.22146/ijc.99143

Khoa Dang Nguyen⁽¹⁾, Khoa Dang Tran⁽²⁾, Van Thi Tuong Pham⁽³⁾, Ha Vu Le^(4*)

(1) Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City 740010, Vietnam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City 720325, Vietnam
(2) Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City 740010, Vietnam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City 720325, Vietnam
(3) Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City 740010, Vietnam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City 720325, Vietnam
(4) Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City 740010, Vietnam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City 720325, Vietnam
(*) Corresponding Author

Abstract

In this study, a simple and solvent-free grinding method was employed to produce nanostructured cobalt ferrites (CoFe₂O₄). Their morphology and textural properties were notably found to be impacted by the calcination. Notably, the prepared material calcinated at 250 °C exhibited high mesoporosity with a surface area of 186 m² g⁻¹ and a pore size of approximately 3.2 nm, while the highly crystalline CoFe₂O₄ with sparse pore structure would tend to be more favorable as increasing calcination temperatures. At 550 °C, the CoFe₂O₄ material specifically formed a well-defined shape, albeit with non-uniform particle sizes ranging from 40 to 80 nm. These distinct nanostructures were completely lost upon calcination at 900 °C, resulting in a bulk CoFe₂O₄ with a very high crystallinity. Furthermore, the study also investigated the influence of polyvinylpyrrolidone (PVP) on the structure and morphology of as-prepared CoFe₂O₄. It was observed that PVP could mitigate sintering, leading to the increase in the surface area of CoFe₂O₄ calcined at 550 °C due to the decrease in nanoparticle size.

Keywords

cobalt ferrites; mechanochemistry; nanostructure; polyvinylpyrrolidone

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DOI: https://doi.org/10.22146/ijc.99143