REMOVAL OF SAFRANIN FROM THE ENVIRONMENT BY USING GRAPHENE OXIDE PAPER
To create interspace-enlarged and sites-exposed graphene-based adsorbents for pollutant management, two-dimensional macrostructures were facilely constructed via self-assembly of two-dimensional graphene oxide nanosheets (2D GO). The flexible, free-standing GO paper was prepared by vacuum filtration of GO dispersion. GO composite paper was characterized by using Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy. GO paper was used as adsorbents for safranin. After the adsorption of safranin on GO paper, it has been observed that the surface structure is very compact. Moreover, it was determined that with the penetration of safranin between the GO layers, the distances between the plates increased. The FTIR spectrum obtained after safranin is adsorbed on the GO, in addition to the vibration peaks of GO, the peaks corresponding to the C=N vibration in the phenazine ring occurred new peaks at around 1900 cm(-1). XPS spectrum of the GO paper before safranin adsorption revealed C (1s) and O (1s) peaks, while that after adsorption exhibited the N (1s) peak beside the C (1s) and O (1s) peaks. Raman measurements were also performed to determine the microstructure of GO paper before and after safranin adsorption. GO paper displays two peaks at 1345 and 1650 cm-1, corresponding to the well-documented D and G bands, respectively. The intensity ratios of the D and G bands (ID/IG) are calculated to determine the surface defects of graphene-based paper ID/IG for the safranin absorbed GO paper (0.75) decreases in comparison with that of the GO paper (0.92), confirming the adsorption of safranin species to disordered regions of GO surface. This composite paper exhibited superior adsorption capabilities for safranin (8.1 mg cm(-2)). The adsorption capacity of GO paper for safranin is higher than other two-dimensional conventional adsorbents reported; this can be attributed to electrostatic attraction and pi-pi interactions between GO and safranin. We propose a super graphene-based adsorbent that is competitive and scalable for water purification.
- Dergi
- REVUE ROUMAINE DE CHIMIE
- Yıl
- 2021
- Cilt
- 66
- Sayı
- 7
- Sayfa
- 675-681
- ISSN
- 0035-3930
- DOI
- 10.33224/rrch.2021.66.7.10
- WoS UID
- WOS:000889466200009