Journal
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
Volume 97, Issue 8, Pages 2032-2046Publisher
WILEY
DOI: 10.1002/jctb.7074
Keywords
biomass; transformation; environmental chemistry; characterisation
Categories
Funding
- Sao Paulo Research Foundation-FAPESP [2005/51242-8, 2011/00574-1, 2012/23066-4, 2013/21776-7, 2014/10368-8, 2014/22400-3, 2015/22954-1, 2017/13230-5, 2017/26718-6, 2018/15733-7, 2021/09126-3]
- CAPES-DS
- National Council for Scientific and Technological Development-CNPq [445487/2014-3, 307925/2012-9]
- Cearense Foundation [PRONEX PR2-0101-00006.01.00/15]
- CNPq [313637/2019-9 (CNPq DT 29/2019)]
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In this study, a magnetic carbon nanocomposite was prepared using sugar cane bagasse as a carbon source. The nanocomposite exhibited good adsorption properties and showed potential for hexavalent chromium removal.
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 mu g g(-1)), when compared to MCN-SB (768 mu g 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. (c) 2022 Society of Chemical Industry (SCI).
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