Fecha de publicación: 18/11/2024 Fuente: Cellulose (Springer) Abstract
This research aims to remove cationic and anionic dyes from industrial wastewater by enhancing traditional techniques. To achieve this, cotton fabric was coated with plastic waste-derived Multiwalled carbon nanotubes (MWCNT) and their oxidized forms for efficient dye removal. The MWCNT were oxidized to unzipped carbon nanotube oxides (UMCNO), as evidenced by surface images obtained through FESEM. The addition of oxidized bonds was analyzed using FTIR, and their crystallographic changes were examined using XRD data. These materials were then mixed with a water solution and vacuum-filtered through cotton fabric. Some fabric samples remained untreated, while others were coated with a biodegradable PVA solution. A comparative study on the removal of methylene blue (MB) and congo red (CR) dyes was conducted for filters F-1 to F-4. It was noted that the application of a PVA coating formed a protective film on the fabric surface, enhancing the removal efficiency for both cationic and anionic dyes. The UMCNO_PVA-coated cotton fabric exhibited the highest efficiency, removing 88% and 77% of MB and CR, respectively. However, the MWCNT-coated cotton fabric (F-1) demonstrated the highest flux rates, reaching 3375 LMH for MB and 2703 LMH for CR dyes, indicating that while the PVA coating improved dye removal, it reduced flux rates. Further experiments involved stacking filters F-2 and F-4 sequentially to create filters F-5 to F-9. Among these stacked coated fabrics, F-9 showed the highest MB removal at 99.16% and CR removal at 90.47%, with flux rates of 415 LMH and 355 LMH, respectively.