adsorption mechanism of lead on wood/nano-manganese oxide composite

Discharge of untreated industrial wastewater containing heavy metals such as pb^2+ is hazardous to the environment due to their high toxicity. this study reports on the adsorption, desorption, and kinetic study on pb^2+ removal from aqueous solutions using wood/nanomanganese oxide composite (wbnmo). the optimum ph, contact time and temperature for adsorption were found to be 5.0, 4 h and 333 k, respectively. pseudosecondorder kinetics best described the adsorption process with an initial sorption rate of 4.0 mg g min^-1, and a halfadsorption time t1/2 of 31.6 min. best fit for adsorption isotherm was obtained with the brunauer-emmettteller (bet) model with a maximum adsorption capacity of 213 mg/g for an initial metal concentration of 60 mg/l. both intraparticle diffusion and film diffusion contribute to the ratedetermining step. desorption experiments with 0.5 mol/l hcl, inferred the reusability of the composite. adsorption experiment of pb^2+ from industrial wastewater confirmed that the prepared wbnmo is a promising candidate for wastewater treatment. the wbnmo demonstrated high pb^2+ removal efficiency and is considered as a promising alternative and reusable composite for lead removal from contaminated effluents.