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All Journal Indonesian Journal of Chemistry
Tran, Khoa Dang
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Chemical Engineering, Chemistry & Bioengineering Chemistry

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Solvent-Free Synthesis of Co-Based Zeolitic Imidazolate Framework (ZIF-9) for the Removal of Congo Red from Water Tran, Khoa Dang; Phan, Hoan Tuan; Nguyen, Chi Thi Kim; Nguyen, Bao Chi; Le, Ha Vu; Nguyen, Khoa Dang
Indonesian Journal of Chemistry Vol 25, No 1 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.99141

Abstract

The study presented a green and benign approach via mechanochemistry for rapidly preparing a typical cobalt-based zeolitic imidazolate framework, namely ZIF-9. The structural, morphological and textural properties of the obtained material were confirmed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and nitrogen sorption at 77 K. The prepared material was then employed as an efficient adsorbent to remove Congo red (CR) from the aqueous solution. Intensive experiments were then conducted with the removal of CR to investigate the effect of adsorption conditions, including contacting time, pH value, and initial concentration of organic dye solution. The adsorption process follows the pseudo-second-order kinetic model, indicating that the adsorption of the CR dye is primarily chemical adsorption. The Langmuir model fitted the experimental data with a maximum adsorption quantity of 248.22 mg/g. Besides, the adsorption capacity of prepared ZIF-9 still remained stable after three cycles. This strategy was a simple method compared to conventional methods in terms of reducing the amount of used solvents, energy requirements, and the duration of the synthetic process.
Environmentally Friendly and Facile Solid-State Synthesis of Nanostructured Cobalt Ferrites Nguyen, Khoa Dang; Tran, Khoa Dang; Pham, Van Thi Tuong; Le, Ha Vu
Indonesian Journal of Chemistry Vol 25, No 3 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.99143

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.
Co-Authors Le, Ha Vu Nguyen, Bao Chi Nguyen, Chi Thi Kim Nguyen, Khoa Dang Pham, Van Thi Tuong Phan, Hoan Tuan