60-44 Adsorption of Acid Red 27 Dye onto Activated Carbons Prepared from Coconut Shell and Coir Charcoal: Kinetics and Isotherm Studies

Session: 2YC and 4YCU Geoscience Student Research Poster Showcase

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Abstract:

The study investigated how Acid Red 27 (AR27) dye can be eliminated from aqueous solution utilizing activated carbons made from coconut coir charcoal (CCC) and coconut shell charcoal (CSC), which are both common types of agricultural waste in Bangladesh. The aim of this study is to find out how effectively these inexpensive and eco-friendly adsorbents remove the dye using adsorption kinetics and isotherms. In the batch adsorption observations, the impacts of various operational parameters, such as pH (2–10), initial dye concentration (10–80 mg/L), dose of adsorbent (0.5–20 g/L), and contact time (1–180 min) were studied. At pH 2, the highest removal of AR27 was 86% (CCC) and 95% (CSC), and the equilibrium contact time was 150 minutes.The pseudo-second-order model followed the adsorption kinetics, which means that chemical adsorption is its primary procedure. The isotherm analyses suggested that the adsorption was thoroughly examined by the Langmuir and Freundlich models. For AR27, the Freundlich isotherm model suited the results on adsorption better than the Langmuir model. That is, multilayer adsorption took place on surfaces that were not homogeneous. For CCC and CSC, the highest capacities of adsorption were calculated to be 8.1103 mg/g and 6.7476 mg/g, respectively. FTIR and SEM showed that the adsorbents have groups of functions and porous features that helped them hold onto dyes. The results show that activated carbons made from coconut shell and coir are excellent adsorbent materials for getting rid of dye from liquid solution since they are affordable, efficient, and are beneficial to the environment.

Key words: Adsorption, Acid Red 27, Isotherms, Kinetics, Coconut coir charcoal, Coconut shell charcoal

Geological Society of America Abstracts with Program. Vol. 57, No. 6, 2025

doi: 10.1130/abs/2025AM-9664

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