Adsorption and precipitation of anionic dye Reactive Red 120 from aqueous solution by aminopropyl functionalized magnesium phyllosilicate

Dye wastewater causing destruction in ecosystem from a variety of plants an operation needs various factors for environmental cleanup. To improve removal efficiency of dye wastewater, various adsorbents including clay and nonclay-related materials have been tried. The use of soluble aminopropyl functionalized magnesium phyllosilicate (Mg-AMP clay) as an adsorbent for the textile anionic dye Reactive Red 120 (RR 120) was examined thermodynamically and kinetically. The adsorption kinetics followed the pseudo-second-order and Langmuir isotherm equation fitted best models. A maximum amount of adsorption was determined to be 229.9 mg/g, which is one of the highest values studied so far. An Mg-AMP clay dosage of 10 mg/mL obtained from Langmuir model a maximum adsorption capacity of 229.94, 182.26 and 156.54 mg/g at 298.15, 308.15 and 318.15 K, respectively. Moreover the thermodynamic activation parameters such as enthalpy and entropy were determined. We suggest the removal mechanism of RR 120 using Mg-AMP clay by adsorption and precipitation.