Facile preparation of Fe2O3 Al2O3 composite with excellent adsorption properties towards Congo red. Issue 10 (15th May 2021)

• Record Type: Journal Article
• Authors: Jiang, Yue; Mao, Qiushuo; Ma, Tianhao; Liu, Xiaoguang; Li, Yan; Ren, Shubin; Sun, Jialin
• Is Part Of: Ceramics international. Volume 47:Issue 10(2021)Part A
• Page Start: 13884
• Page End: 13894
• Publication Date: 2021-05-15
• Subjects: Iron oxide -- Aluminum oxide -- Sol-gel -- OSSD -- Adsorption -- Congo red; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.01.255
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: To remove the harmful dye Congo red (CR) from water, porous Fe2 O3 Al2 O3 composite was designed using a sol-gel and an organic solvent sublimation drying (OSSD) strategy. The composite contained mainly γ-Al2 O3, together with various amounts of γ-Fe2 O3, α-Fe2 O3, and/or AlFeO3 if Fe/Al and heating strategy were properly controlled. It has high specific surface areas ranging from 126 to 210 m 2 /g. Its pores (10–30 nm) were formed between the homogeneously mixed Fe2 O3 and Al2 O3 spherical nano particles. Its CR adsorption behaviour was affected by such factors as pH, initial CR concentration and contact time, and had reached a maximum equilibrium adsorption capacity of ~941 mg/g under the neutral pH condition (~7.5) and an initial CR concentration of 100 mg/L. Such adsorption behaviour obeyed the Weber-Morris intra-particle diffusion, pseudo-second-order kinetic and Freundlich isotherm models, suggesting that the adsorption behaviour was kinetically limited by the intra-particle diffusion and chemical adsorption steps and it was likely to be multi-layer adsorption. Furthermore, it also showed a magnetization of around 3.48–5.51 emu/g under the magnetic field (3T), ensuring decent magnetic properties for recycling. This work may provide new insights for the efficient removal of organic dyes.