| Summary: | This work demonstrated the use of β-cyclodextrin-toluene-2,4-diisocyanate (β-CD-TDI) polymer as an adsorbent for the removal of 4-aminobiphenyl and benzidine. The successfully synthesised β-CD-TDI polymer was characterised using FT-IR, SEM, and XRD. In the XRD analysis, the decrease in peak intensity indicates a decrease in the degree of crystallinity of the polymer resulting from the inclusion of TDI molecules. The FTIR result shows a peak located at 872 cm-1 indicating the presence of α-(1,4) glycopyranose originating from β-CD as well as 1600 cm-1 and 1592 cm-1 representing the ring from TDI respectively. The surface morphology for β-CD-TDI polymer had shrunk and became rough indicating the cross-linking process between β-CD and TDI taking place during polymerization. The optimal pH for the removal of 4-aminobiphenyl and benzidine was pH 5. The quantitative measurements were performed using a UV-Vis spectrophotometer at 272 nm and 281 nm for 4-aminobiphenyl and benzidine, respectively. The removal percentages under optimised conditions were 99.61 % and 95.65 % for 4-aminobiphenyl and benzidine, respectively. The coefficient of determination (R2) values were 0.9995 and 0.9996 for 4-aminobiphenyl and benzidine, respectively. Pseudo second-order and Dubinin-Raduchkevich models were found to fit the adsorption of 4-aminobiphenyl and benzidine onto the β-CD-TDI polymer. The current developed method of removal was tested using wastewater collected from 3 different batik manufacturers in Kota Bharu, Kelantan, Malaysia. The β-CD-TDI polymer possesses exceptional adsorption properties, making it a highly efficient alternative adsorbent for the removal of aromatic amines. © 2024, Malaysian Society of Analytical Sciences. All rights reserved.
|
|---|