The contamination of water sources
with the heavy metal
contaminant
arsenic (As) causes substantial risks to humans, animals, and other
living organisms. Therefore, the introduction of methods for the removal
of As is important. The present study aimed to investigate the adsorption
model and mechanism of As removal utilizing natural soil adsorbents.
The batch adsorption technique was used to analyze the impacts of
various parameters such as contact time, initial As concentration,
pH, and temperature. Adsorption mechanisms were studied through adsorption
kinetic, isotherm, and thermodynamic models. The batch adsorption
study findings indicate that the optimal conditions for maximum As
removal were achieved by application of 2.2 g of adsorbents in 50
μg/L of As solution for 60 min of contact time at a pH of 5.5
± 0.5 and a temperature of 40 °C. The highest removal efficiency
was achieved when red soil was employed as the adsorbent. The kinetic,
isotherm, and thermodynamic models revealed that As adsorption was
a chemisorptive, nonspontaneous, and endothermic process.