Biosorption of Cu(II), Pb(II) from electroplating industry effluents by treated shrimp shell

The current investigation focuses on a systematic study of application of treated shrimp shell waste (TSSW) as a potential biosorbent in removal of Cu(II) and Pb(II) from hazardous industrial effluents. The surface characterization and morphological studies indicated that biosorption is owing to ion complexation and exchange, and chemical adsorption mechanism. The effects of pH (1–10), time dependency (1–60 min), initial concentration of Cu(II) and Pb(II) (20–100 mg L⁻¹), TSSW loading (0.1–0.5 g) and temperature (303–333 K) on biosorption efficiency using TSSW were examined through experiments. The experimental discoveries indicated that maximum biosorption efficacies were 96.42% at pH 5, 40 min for Cu (II) and 89.77% at pH 6, 30 min for Pb(II), 20 mg L⁻¹ concentration, 0.1 g loading and 303 K temperature. Langmuir, Freundlich, Temkin, and Dubinin - Radushkevich isotherm models were used to examine experimental findings and the Langmuir model was well fitted one. The maximum Cu(II), Pb(II) removal capacities by TSSW were 22.67, 15.32 mg g⁻¹ according to Langmuir model. Pseudo second order model was excellent suited to kinetics which shows that chemisorption was involved for the transfer of Cu(II), Pb(II) to TSSW surface with three different intra particle diffusional stages. Hence, this study revealed that TSSW has a great potential to be an environment friendly and economic biosorbent for removal of Cu(II) and Pb(II) containing industrial effluent.