| Full text | |
| Author(s): |
Nogueira, Gabriela A.
;
Fregolente, Lais G.
;
Pereira, Lorena S.
;
Laranja, Marcio J.
;
Moreira, Altair B.
;
Ferreira, Odair P.
;
Bisinoti, Marcia C.
Total Authors: 7
|
| Document type: | Journal article |
| Source: | MATERIALS TODAY SUSTAINABILITY; v. 28, p. 12-pg., 2024-12-01. |
| Abstract | |
The presence of hexavalent chromium (Cr (VI)) in effluents remains a global concern due to its toxic properties. Even though adsorption has been employed for its removal from water, developing sustainable materials with higher adsorption capacities is still pivotal to tackling such contamination. In this study, two magnetic carbons (MC) were produced by hydrothermal carbonization (HTC) of sugarcane bagasse in the presence of iron (III) nitrate at 230 and 270 degrees C. Both MCs were thermochemically activated at 500 and 700 degrees C using KOH (1:2; w:w). The materials were characterized in terms of composition, structure, morphology, texture, and surface properties and then evaluated in adsorption studies of Cr (VI). After HTC, some iron phases such as alpha-Fe2O3, gamma-Fe2O3, and Fe3O4 were observed, while thermochemical activation additionally revealed Fe0 and Fe4[Fe(CN)6]3. Activation increased the amount of meso- and macropores, specific surface area, pHzpc, surface hydrophilicity, and carbon and nitrogen contents. The adsorption kinetics study indicated that the pseudo-second-order model describes better the behavior of the materials. The investigation of adsorbent dose showed that doses below 1.00 g L- 1 were more efficient in Cr (VI) removal. MC-230 and MC-270 thermochemically activated at 700 degrees C exhibited the highest Cr (VI) adsorption capacities (10.5 and 15.5 mg g- 1, respectively). Therefore, the improved adsorption capacity for Cr (VI) of the materials thermochemically activated at 700 degrees C was mainly due to their enhanced textural properties. (AU) | |
| FAPESP's process: | 21/12214-1 - Properties and application of organic matter extracted from hydrochar and process water obtened of the hydrothermal carbonization of sugarcane bagasse and vinasse |
| Grantee: | Altair Benedito Moreira |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 20/02471-4 - Valorization of sugar cane fusel oil by catalytic partial dehydrogenation |
| Grantee: | Mauricio Boscolo |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 21/08839-6 - Production of activated magnetic carbon with KOH for removal of chromium species |
| Grantee: | Gabriela Aparecida Nogueira |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| FAPESP's process: | 21/09126-3 - Activation of carbon magnetic nanocomposites for adsorption of inorganic and organic compounds |
| Grantee: | Márcia Cristina Bisinoti |
| Support Opportunities: | Program for Research on Bioenergy (BIOEN) - Regular Program Grants |