sorption article 8 Sorption 6 Acids 4 Adsorption 4 Adsorption isotherms 4 Atmospheric temperature 4 Chemical oxygen demand 4 Chemicals removal (water treatment) 4 Equilibrium conditions 4 Metal pollution 4 Metal recovery 4 Metal sorptions 4 Models, Chemical 4 Sorption capacities 4 Spectroscopy, Fourier Transform Infrared 4 Wastewater 4 Water Pollutants, Chemical 4 Water Purification 4 Water Treatment 4 comparative study 4 soil pollution 4 waste water 4 wastewater 4 AS models 2 Absorption 2 Activated Carbon 2 Activated carbon 2 Activated carbons 2 Alkali Lignins 2