Adsorption 1 Adsorption capacities 1 Adsorption process 1 Coconut frond 1 EDTA 1 EDTA dianhydride Equilibrium state 1 Ions 1 Lead compounds 1 Lead removal 1 Optimum conditions 1 Potential adsorbents 1 Pseudo second order kinetics 1 Rate-limiting steps 1 Thermodynamic studies 1 concentration (composition) 1 enthalpy 1 ion exchange 1 isotherm 1 lead 1 plant residue 1 pollutant removal 1 reaction kinetics 1 thermodynamics 1