Ulfa Maria, Prasetyoko Didik, Bahruji Hasliza, Nugraha Reva Edra
Chemistry Education Study Program, Faculty of Teacher Training and Education, Sebelas Maret University, Jl. Ir. Sutami 36A, Surakarta 57126, Indonesia.
Department of Chemistry, Faculty of Science, Institut Teknologi Sepuluh Nopember, Keputih, Sukolilo, Surabaya 60111, Indonesia.
Materials (Basel). 2021 Nov 10;14(22):6779. doi: 10.3390/ma14226779.
Hematite (α-FeO) with uniform hexagonal flake 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 °C with the average size was measured at 1-3 µm. Increasing the calcination temperature to 700 °C 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 m/g to 9 m/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. α-FeO 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 as the calcination temperatures increased due to the reduction of available surface area of the hexagonal flakes after transforming into cubes. Photocatalytic degradation of ibuprofen using hematite flakes achieved 50% removal efficiency; meanwhile, combination of adsorption and photocatalytic degradation further removed 80% of ibuprofen in water/hexane mixtures.
通过水热法将明胶作为天然模板与F127结合，成功合成了具有均匀六方片状形态的赤铁矿（α-Fe₂O₃）。将所得赤铁矿作为吸附剂和光催化剂用于去除作为药物废物的布洛芬进行了研究。在500℃煅烧后获得六方片状赤铁矿，其平均尺寸测量为1-3μm。将煅烧温度提高到700℃会使均匀的六方结构转变为立方体形貌。随着煅烧温度的升高，赤铁矿也表现出高的热稳定性；然而，比表面积从47m²/g降低到9m²/g。傅里叶变换红外光谱（FTIR）分析进一步证实了Fe-O-Fe键的形成，并且在所有样品的能谱（EDX）分析中观察到主要组成元素Fe和O。当用作布洛芬的吸附剂时，α-Fe₂O₃样品在12-22%的去除效率下平均吸附容量为55-25.5mg/g。由于六方薄片转变为立方体后可用表面积的减少，随着煅烧温度的升高吸附容量降低。使用赤铁矿薄片对布洛芬进行光催化降解实现了50%的去除效率；同时，吸附和光催化降解相结合进一步去除了水/己烷混合物中80%的布洛芬。
