Adsorption of the monocrotophos pesticide from aqueous solution using "waste" jute fiber (JF) has been investigated. Adsorption equilibrium, kinetics, thermodynamics, and mass transfer studies were investigated as a function of agitation time, adsorbent dose, pH, and temperature. The adsorption kinetics were analyzed by using pseudofirst-order and pseudosecond-order kinetic equations. The adsorption isotherm data were fitted well by the Langmuir isotherm model, and the adsorption capacity was found to be 124 mg • L -1 . Thermodynamic parameters of the adsorption process, that is, ∆G, ∆S, and ∆H, were calculated, and their negative values indicate the adsorption was exothermic and had a spontaneous nature. The effective diffusion coefficients were calculated with respect to the variation in concentration and temperature. A single-stage batch adsorption process was also designed by using the adsorption isotherm data.

Sulfuric acid treated biopolymers (STB) were prepared from a lignocellulosic-based agricultural byproduct. The STB has been used as an effective adsorbent in a batch experiment for the removal of methyl parathion (MP) from aqueous solution. The as-prepared STB has been characterized by using surface area analyzer, scanning electron microscope (SEM), elemental analyzer, and proximate analysis methods. A batch adsorption study was carried out to investigate the adsorption equilibrium, kinetics, and thermodynamics as a function of agitation time, initial concentration of MP, initial pH, temperature, and carbon dose. Adsorption data were used to perform the kinetic models. The adsorption data was found to obey the Langmuir adsorption isotherm. Thermodynamic parameters of the adsorption process ΔG, ΔS, and ΔH were calculated, and their negative values indicate the feasible exothermic and spontaneous nature of the process. The diffusion of the MP molecule onto the biopolymer was confirmed by using the Weber–Morris equation. Reichenberg's equation shows the film diffusion of MP.