Adsorptive Capacity of Surface-Modified Red Soil-Based AAB for Removal of Anionic Dye

Recently, alkali-activated binder (AAB) has become a common adsorbent for removing heavy metals and dyes. The adsorption and anion exchange capabilities of AAB may be improved by surface modification using a cationic surfactant. This study aimed to determine how efficiently surface-modified red soil-based AAB performed as an adsorbent for the removal of an anionic dye, methyl orange (MO), from aqueous solution. Numerous process factors, including the impact of contact time and adsorbent dosages, were investigated in the batch investigations. The study showed that the surface-modified AAB adsorbent had better removal efficiency than the unmodified samples. The improved AAB adsorbent had an adsorption capacity of 31.75 mg/g. The adsorption processed according to the pseudo-second-order kinetic model and Langmuir isotherm. The outcomes showed that methyl orange can be removed from aqueous solution at low costs using surface-modified red soil-based AAB as an adsorbent.