| Autor: |
de Assis LK; Unidade Acadêmica do Cabo de Santo Agostinho (UACSA), Universidade Federal Rural de Pernambuco, Cabo de Santo Agostinho, Brazil., Damasceno BS; Unidade Acadêmica do Cabo de Santo Agostinho (UACSA), Universidade Federal Rural de Pernambuco, Cabo de Santo Agostinho, Brazil., Carvalho MN; Departamento de Engenharia Química, Universidade Federal de Pernambuco (UFPE), Recife, Brazil., Oliveira EHC; Departamento de Engenharia Química, Universidade Federal de Pernambuco (UFPE), Recife, Brazil., Ghislandi MG; Unidade Acadêmica do Cabo de Santo Agostinho (UACSA), Universidade Federal Rural de Pernambuco, Cabo de Santo Agostinho, Brazil. |
| Jazyk: |
angličtina |
| Zdroj: |
Environmental technology [Environ Technol] 2020 Jul; Vol. 41 (18), pp. 2360-2371. Date of Electronic Publication: 2019 Jan 17. |
| DOI: |
10.1080/09593330.2019.1567603 |
| Abstrakt: |
The synthesis of graphene oxide (GO) nanosheets, to be used as an adsorbent for the removal of textile dyes from wastewater, was optimized by the modified Hummers method. The GO nanosheets produced were compared with commercial graphene and characterized by X-ray diffractometry (XRD), Raman spectroscopy, specific surface area analysis, and zero-charge point (pHpcz). Both GO and graphene nanomaterials were originally used to adsorb two coloured dyes (direct red 81 and Indosol SFGL direct blue), which are commonly disposed in textile industrial effluents. Adsorptive assays were performed to determine and compare the variables that most influence the process, such as pH and dye concentration. The mechanisms of adsorption are proposed based on the strong interactions between the graphene oxide (due to its high functionalization with hydroxyl and carboxylic groups) and the active functional groups of the dyes (according to its colour) that, in general, overcome the weaker electrostatic forces between water/commercial graphene/dye systems. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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