| Texto completo | |
| Autor(es): |
Galvani, Giovana M.
;
Zito, Cecilia A.
;
Perfecto, Tarcisio M.
;
Malafatti, Joao Otavio D.
;
Paris, Elaine C.
;
Volanti, Diogo P.
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Materials Chemistry and Physics; v. 290, p. 11-pg., 2022-08-12. |
| Resumo | |
Strategies for developing new adsorbents are necessary for more efficient processes to remove contaminants from wastewater. Thus, it is essential to adjust the synthesis parameters of the adsorbent nanomaterial to control the surface area and morphology and, therefore, enhance the adsorption performance. Herein, alpha-Ni(OH)(2) nanosheets were synthesized via a simple and fast microwave-assisted solvothermal method and converted to NiO nano -structures by calcination in air. The effect of different calcination temperatures (range of 300-600 C) on the morphology, crystal structure, and adsorption performance of Congo red (CR) was evaluated. The calcination of alpha-Ni(OH)(2) at 300? resulted in 2D NiO nanosheets, which showed the best performance to remove CR dye due to the increased surface area and porosity provided by the 2D morphology. The nanosheet-like structure is lost with increasing the calcination temperature and the nanoparticles become bigger, consequently, the CR adsorption capacities are significantly reduced. The 2D NiO nanosheets can adsorb a significant amount of CR quickly, reaching equilibrium after only 120 min, indicating a high affinity between the adsorbate species and the surface of the adsorbent. Additionally, the adsorption isotherm was compatible with the Langmuir model, which pro-vides a maximum calculated adsorption capacity of 259.74 mg g-1. Thus, our findings showed how to adequate the synthesis parameters to obtain NiO nanosheets and improve the adsorption parameters to CR, which can be extended to the fabrication of new materials to promote advances in sustainable technologies. (AU) | |
| Processo FAPESP: | 18/01258-5 - Novos processos catalíticos e fotocatalíticos para a conversão direta de metano e CO2 em produtos |
| Beneficiário: | José Maria Correa Bueno |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 20/06421-1 - Desenvolvimento de sensores derivados de estruturas metal-orgânicas para detecção de compostos orgânicos voláteis microbianos |
| Beneficiário: | Diogo Paschoalini Volanti |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 18/00033-0 - Dispositivos sensores de compostos orgânicos voláteis baseados em heteroestruturas ocas de ZnO/semicondutores do tipo-p |
| Beneficiário: | Tarcísio Micheli Perfecto |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 17/01267-1 - Compósitos de ácido grafênico-óxidos metálicos ocos para sensor de gás |
| Beneficiário: | Diogo Paschoalini Volanti |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 16/25267-8 - Compósitos de ácido grafênico com estruturas de CeO2 ocas e Pd-CeO2 do tipo gema-casca aplicados como sensores de compostos orgânicos voláteis |
| Beneficiário: | Cecilia de Almeida Zito |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |