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materialsArticleGreen Synthesis of Hexagonal Hematite (-Fe2O3) Flakes Applying Pluronic F127-Gelatin Template for Adsorption and Photodegradation of IbuprofenMaria Ulfa 1, , Didik Prasetyoko two , Hasliza Bahruji three and Reva Edra NugrahaChemistry Education Study Program, Faculty of Teacher Education and Education, Sebelas Maret University, Jl. Ir. Sutami 36A, Surakarta 57126, Indonesia Division of Chemistry, Faculty of Science, Institut Teknologi Sepuluh Nopember, Keputih, Sukolilo, Surabaya 60111, Indonesia; [email protected] Centre of Sophisticated Material and Power Sciences, University Brunei Darussalam, Jalan Tungku Link, Gadong, Charybdotoxin manufacturer Bandar Seri Begawan BE1410, Brunei; [email protected] Department of Chemical Engineering, Faculty of Engineering, Universitas Pembangunan Nasional “Veteran” Jawa Timur, Surabaya 60294, Indonesia; [email protected] Correspondence: [email protected]: Ulfa, M.; Prasetyoko, D.; Bahruji, H.; Nugraha, R.E. Green Synthesis of Hexagonal Hematite (-Fe2 O3 ) Flakes Employing Pluronic F127-Gelatin Template for Adsorption and Photodegradation of Ibuprofen. Materials 2021, 14, 6779. https://doi.org/10.3390/ma14226779 Academic Editor: John T. Kiwi Received: 5 October 2021 Accepted: 5 November 2021 Published: 10 NovemberAbstract: Hematite (-Fe2 O3 ) with uniform hexagonal flake morphology has been effectively synthesized using a mixture of gelatin as organic template with F127 through 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 C together with the average size was measured at 1 . Increasing the calcination temperature to 700 C transformed the uniform hexagonal structure into cubic shape morphology. Hematite also showed high thermal stability with growing the calcination temperatures; nonetheless, the surface region was lowered from 47 m2 /g to 9 m2 /g. FTIR evaluation further confirmed the formation Fe-O-Fe bonds, and also the major constituent components of Fe and O had been observed in EDX analysis for all samples. -Fe2 O3 samples have an average adsorption capacity of 555.5 mg/g at 122 of removal efficiency when utilized as adsorbent for ibuprofen. The adsorption capacity was decreased because the calcination Thromboxane B2 Epigenetic Reader Domain temperatures improved due to the reduction of available surface area of the hexagonal flakes after transforming into cubes. Photocatalytic degradation of ibuprofen applying hematite flakes accomplished 50 removal efficiency; meanwhile, mixture of adsorption and photocatalytic degradation further removed 80 of ibuprofen in water/hexane mixtures. Keyword phrases: -Fe2 O3 ; hematite; gelatin; F-127; hexagonal-flake; adsorption; ibuprofenPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.1. Introduction Hematite has been broadly investigated as adsorbent for removal of dye, pharmaceutical compound, heavy metal, and industrial waste [1]. Hematite can also be referred to as -Fe2 O3 , which is just about the most thermodynamically stable sorts of iron oxide due to the powerful interaction between the electrons [5]. Hematite structure resembles corundum, in which the Fe3 cations are connected for the octahedral oxygen by way of the covalent bonds in a hexagonal closed packing crystal system [4]. Hematite was reported to have high adsorption performance and stability, and to be quick and low cost to synthesi.
