Adsorption of Malachite Green Using Magnetic Activated Carbon
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Abstract
This research aimed to study the adsorption of malachite green (MG) in synthetic wastewater using magnetic-activated carbon (MAC). All experiments were conducted using the batch technique. Significant adsorption factors consisted of pH, contact time, initial MG concentration, and temperature. The adsorption isotherms, kinetics, and thermodynamics were investigated to explain the adsorption mechanisms. Furthermore, desorption was studied to evaluate the appropriate approach for spent adsorbent management. The results indicated that the optimal adsorption was pH 5, contact time of 240 minutes, initial MG concentration of 500 mg/L, and temperature of 60°C. The kinetic results presented that the pseudo-second-order reaction model best described the adsorption process with chemisorption being the rate-limiting step. The equilibrium data fitted well with Langmuir adsorption isotherm with a monolayer adsorption capacity of 357.14 mg/g at 333 K. Thermodynamic results showed that the sorption process was spontaneous and endothermic. Furthermore, the desorption results indicated that the acidic solution could leach adsorbed MG on MAC. However, the desorption efficiencies weren’t high so the secured landfill is the suitable method for managing spent magnetic activated carbon. All results suggested that MAC is a potential adsorbent for removing MG from wastewater.
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