adsorbent Article 10 Adsorption 8 adsorption 8 pH 5 surface area 5 Water Pollutants, Chemical 4 X ray diffraction 4 aqueous solution 4 desorption 4 particle size 4 scanning electron microscopy 4 unclassified drug 4 waste water management 4 water pollutant 4 Chemicals removal (water treatment) 3 Fourier transform infrared spectroscopy 3 Kinetics 3 Magnetite 3 Morphology 3 Waste Water 3 Water Purification 3 activated carbon 3 chemistry 3 controlled study 3 ferric hydroxide 3 isolation and purification 3 isotherm 3 kinetics 3 magnetite nanoparticle 3