Isotherm modelling of Pb sorption by lime and SSP from contaminated waste waters Ganesan Mohanapriya, Thiyagarajan Chitdeshwari1,*, Rengaswamy Shanmugasundaram, Muthunalliappan Maheswari2, Alagarswamy Senthil3 Department of Soil Science and Agricultural Chemistry, TNAU, Coimbatore-641 003, India 1Department of Agroforestry, Forest College & Research Institute, Mettupalayam, Coimbatore-641 301, India 2Department of Environmental Sciences, TNAU, Coimbatore-641 003, India 3Department of Crop Physiology, TNAU, Coimbatore-641 003, India *E-mail: chitdeshwari@tnau.ac.in
Online Published on 15 February, 2024. Abstract Lead (Pb) pollution from various industrial activities results in many health issues in plants, animals and human beings. Removal of Pb using inorganic chemicals like lime and phosphates makes it unavailable and prevents its entry into the food chain. This study deals with the removal of lead by chemical sorbents viz., lime and single super phosphate (SSP) from aqueous solutions through a batch incubation experiment. The effect of sorbent dosage, initial Pb2+ concentrations, and incubation time intervals on Pb adsorption was described using isotherm models. It was inferred that, SSP had higher Pb adsorption capacity (6.08 mg g-1) than lime (4.96 mg g-1) which increased with increasing time intervals from 0 to 6.6 mg g-1 for SSP and 5.59 mg g-1 for lime. The adsorption capacity of SSP increased from 1.14 to 12.7 mg g-1 in SSP and 0.99 to 10.1 mg g-1 in lime when the initial Pb concentration increased from 100 to 2000 mg kg-1. Langmuir adsorption iso therm explained the sorption process better than Freundlich model for both the sorbents. Hence, it could be concluded that, SSP is the effective sorbent which can be utilized for the removal of Pb from wastewater and adsorption mechanism was well described by Langmuir adsorption isotherm. Top Keywords Lead, Lime, SSP, Adsorption isotherm, Contaminated water. Top |