Adsorption 4 Adsorption process 4 Batch modes 4 Biosorption 4 Cadmium 4 Copper 4 Kinetics 4 Langmuir models 4 Langmuirs 4 Lead 4 Metal removal 4 Pseudo second order kinetics 4 Removal efficiencies 4 Zinc 4 Zinc compounds 4 acidity 4 article 4 biomass 4 biosorption 4 controlled study 4 copper 4 isotherm kinetics 4 lead 4 nonhuman 4 pH zinc 4 Acidic conditions 2 Adsorption capacities 2 Adsorption efficiency 2