Assessment of C.I. ACID RED 2 Adsorption From Aqueous Solution by Modified, Activated, and Raw Water Hyacinth as a Low-Cost Green Adsorbent

Abstract

The kinetic and isotherms of the adsorption of the C. I. Acid Red 2 onto raw, activated, and modified water hyacinth were studied. Modern techniques used to classify the new agricultural-based biosorbents are FTIR, SEM, TGA, DSC, and XRD. Raw water hyacinth (RWH), activated water hyacinth (AWH), and modified water hyacinth (MWH) were used as green biosorbents in this study. On the decolorization of dye (C. I. Acid Red 2), the consequences of operating parameters such as contact time, the quantity of adsorbent dosage (0.1 to 0.6 g), initial dye concentration, temperature, and pH (2 to 10) have been investigated. Langmuir, Temkin, and Freundlich's modern isotherms were used to interpret equilibrium statistics. At pH 7 the MWH displays the most dye removal (93%), the AWH shows 82% decolorization at pH 8 and RWH also shows maximum adsorption at pH 8 of the dye. In the case of MWH, the maximum adsorption capacity was found to be 93% at 0.4g adsorbent dosage. The MWH was discovered to be a very effective adsorbent for C.I. Acid Red 2 adsorption in all biosorbents. The removal of C.I. Acid Red 2 dye from aqueous solutions is necessary because it has both human and environmental consequences. Raw water hyacinth, activated water hyacinth, and modified water hyacinth appear as a very prospective green adsorbent for the separation of C. I. Acid Red 2 from aqueous solution.