Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Green Synthesis of Hexagonal Hematite (α-Fe2O3 ) Flakes Using Pluronic F127-Gelatin Template for Adsorption and Photodegradation of Ibuprofen

Version 1 : Received: 5 October 2021 / Approved: 8 October 2021 / Online: 8 October 2021 (11:17:24 CEST)

How to cite: Ulfa, M.; Prasetyoko, D.; Bahruji, H.; Nugraha, R.E. Green Synthesis of Hexagonal Hematite (α-Fe2O3 ) Flakes Using Pluronic F127-Gelatin Template for Adsorption and Photodegradation of Ibuprofen. Preprints 2021, 2021100138 (doi: 10.20944/preprints202110.0138.v1). Ulfa, M.; Prasetyoko, D.; Bahruji, H.; Nugraha, R.E. Green Synthesis of Hexagonal Hematite (α-Fe2O3 ) Flakes Using Pluronic F127-Gelatin Template for Adsorption and Photodegradation of Ibuprofen. Preprints 2021, 2021100138 (doi: 10.20944/preprints202110.0138.v1).

Abstract

Hematite (-Fe2O3) with uniform hexagonal flakes morphology has been successfully synthesized using a combination of gelatin as natural template with F127 via hydrothermal method. The resulting hematite was investigated as adsorbent and photocatalyst for removal of ibuprofen as pharmaceutical waste. Hexagonal flake-like hematite was obtained following calcination at 500 oC with the average size was measured at 1-3 µm. Increasing the calcination temperature to 700 oC transformed the uniform hexagonal structure into cubic shape morphology. Hematite also showed high thermal stability with increasing the calcination temperatures, however, the surface area was reduced from 47 m2/g to 9 m2/g. FTIR analysis further confirmed the formation Fe-O-Fe bonds, and the main constituent elements of Fe and O were observed in EDX analysis for all samples. Fe2O3-G samples have an average adsorption capacity of 55-25.5 mg/g at 12-22% of removal efficiency when used as adsorbent for ibuprofen. The adsorption capacity was reduced with increasing the calcination temperatures due to the reduction of available surface area of the hexagonal flakes when transformed into cube. Photocatalytic degradation of ibuprofen using hematite flakes achieved 50% of removal efficiency meanwhile combination of adsorption and photocatalytic degradation further removed 80% of ibuprofen in water/hexane mixtures.

Keywords

α- Fe2O3; hematite; gelatin; f-127; hexagonal-flake; adsorption; ibuprofen

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