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Valorisation of sugar cane bagasse using hydrothermal carbonisation in the preparation of magnetic carbon nanocomposite in a single‐step synthesis applied to chromium adsorption

2022; Wiley; Volume: 97; Issue: 8 Linguagem: Inglês

10.1002/jctb.7074

1097-4660

Márcio Justi Laranja, Francisco HS Júnior, Gabriela A. Nogueira, Laís Helena Sousa Vieira, Naiara C. Oliveira, J.M. Soares, Carlos Daniel da Silva Cordeiro, Larissa Otubo, Altair B. Moreira, Odair P. Ferreira, Márcia Cristina Bisinoti,

Nanomaterials for catalytic reactions

Abstract BACKGROUND Sugar cane bagasse (SB) is a by‐product of the sugar cane industry, and is obtained on a large scale. In this paper, SB was used as a source of carbon for preparing a magnetic carbon nanocomposite (MCN‐SB) through one‐step hydrothermal carbonisation (HTC), in the presence of iron (III) nitrate. By way of comparison, SB was replaced by glucose in HTC (MCN‐GLU), and a thermal treatment of this material was then performed under an N 2 atmosphere (MCN‐GLU‐HT). The physical and chemical properties of the nanocomposites were assessed, and the magnetic samples were applied as adsorbents. RESULTS MCN‐SB and MCN‐GLU are composed of iron oxide nanoparticles embedded in carbonaceous matrix which also contain oxygenated groups. The MCN‐SB sample was already magnetic after HTC, showing a magnetization saturation (M s ) of 5.0 emu g −1 , due to the presence of magnetite, whereas MCN‐GLU consisted of hematite and required additional thermal treatment (HT) to acquire magnetic properties, with MCN‐GLU‐HT showing an M s of 30.5 emu g −1 . In turn, the mesoporous structure and higher specific surface area (SSA) of MCN‐GLU‐HT (SSA 90 m 2 g −1 ) than MCN‐SB (SSA 53 m 2 g −1 ) was a causative factor for its higher capacity of hexavalent chromium [Cr (VI)] removal (939 μg g −1 ), when compared to MCN‐SB (768 μg g −1 ), which has a nonporous structure. CONCLUSION The results suggest that SB can be reused, by means of HTC, for the preparation of a magnetically recoverable adsorbent, showing good adsorption properties. © 2022 Society of Chemical Industry (SCI).