Application of modified Sargassum dupilcatum biomass as an eco-friendly adsorbent for removing coomassie brilliant blue and phosphate ions from solution
摘要
The modification of the surface of macro-alga Sargassum duplicatum (SD-Alg) using the cationic surfactant cetyl trimethyl ammonium chloride (CTACl) has been successfully carried out with the aim of creating a positively charged adsorbent surface (SD-Alg-CTA). The success of the SD-Alg modification is confirmed through FTIR for functional groups, SEM–EDX for composition, and XRD for crystallization. The ability of SD-Alg-CTA to adsorb anionic compounds such as coomassie brilliant blue (CBB) and phosphate ion (PIs) was tested through a series of experiments using the batch method. Adsorption data indicates that SD-Alg-CTA has the highest capacity to adsorb CBB dye at 87.54% at pH 5 and PIs at 96.75% at pH 4. The optimal contact time between CBB or PIs and SD-Alg-CTA is 120 min for CBB and 150 min for PIs. The interaction between CBB and PIs with SD-Alg-CTA tends to follow a pseudo second-order kinetic model and Freundlich adsorption isotherm model. The adsorption capacity of mono-component CBB and PIs by SD-Alg-CTA are 6.27 × 10−2 and 32.468 × 10−2 mmol g−1, respectively, while the adsorption capacity of the bi-component mixture reaches 90.909 mmol g−1. SD-Alg-CTA adsorbent can be used in 3 cycles of adsorption–desorption with the absorption rates of CBB and PIs remaining above 80%. SD-Alg-CTA stands out as a potential adsorbent for further development due to its high adsorption effectiveness, simple manufacturing procedure, and ability to be used repeatedly. This provides significant advantages in industrial applications that require the sustainable use of adsorbents.