Methylene Blue Dye (MBD) and Safranin Dye (SD) Removal Using Activated Carbon Obtained From Rice Husk as Adsorbents

Abstract Dye pollution poses major threats to human health and aquatic ecosystems when it contaminates surface water. This study looks at the efficacy of removing cationic safranin dye (SD) and methylene blue dye (MBD) from synthetic wastewater using activated carbon produced from rice husk (ACRH) as a biowaste adsorbent. Before and after the adsorption procedure, the ACRH was produced and examined using several technologies. ACRH's microrough and heterogeneous surface was shown by SEM pictures, and functional groups such as amines, carboxylic, and hydroxyl groups were found by FTIR analysis. Adsorption studies were used to determine the ideal circumstances by examining the effects of factors such as starting dye concentration, pH, adsorbent dose, and contact duration on removal efficiency. When adsorbed onto ACRH, the removal efficiency for MBD and SD under these circumstances surpassed 99%. Three isotherm models were used: the Freundlich, Temkin, and Langmuir models. For both dyes, the Langmuir model suited the data the best. The adsorption process is shown to follow pseudo-second-order kinetics, according to kinetic studies. Additionally, thermodynamic parameters were computed, and regeneration investigations demonstrated that ACRH could sustain its effectiveness for a maximum of five cycles. This study demonstrates the potential of ACRH as a useful bio adsorbent that can be used to remove MBD and SD dyes from water while also providing a simple and effective manufacturing technique.