LAUSR

In this study, chromium (VI) adsorption was explored using Turbinaria ornata as sorbent and the effects of parameters like temperature, sorbent size, contact time, sorbent dose, and agitation speed were improved using the response surface method. The optimal condition for maximum adsorption of Cr (VI) was found as solution temperature (33.6 °C), sorbent size (0.786 mm), contact time (215 min), agitation speed (117 rpm), and adsorbent dose (2.7 g/l). The maximum removal percentage was found to be 95.25%. The investigational data was also studied using various adsorption models. From the Langmuir model, it was observed that a maximum Cr (VI) uptake of 44.95 mg/g was achieved. Thermodynamic constraints such as ΔG°, ΔH°, and ΔS° have been assessed and it has been originating that the sorption procedure was impulsive and heat releasing in nature. A high R2 value, low root mean square error (RMSE), and mean absolute percentage error (MAPE) suggest that the Cr (VI) adsorption follows the pseudo-first-order model. The characterization of absorbent was studied by FTIR and SEM. The FTIR exposed the connection of some functional groups such as carboxylic acid, hydroxyl, and amino in the adsorption of Cr ions. From all of our data, we conclude that the Turbinaria ornata explored in this work displayed good potential for chromium elimination from synthetic solutions.