Adsorption of Two Textile Dyes from Aqueous Solution by Synthetic Gamma Alumina Particles: Isotherm, Kinetic and Thermodynamic

The current paper aims at investigating the adsorption of textile dyes from aqueous solution with the help of synthetic gamma alumina nanoparticles. The current study was performed on a laboratory scale. Effect of pH, contact time, dye concentration and adsorbent dose on the adsorption of Methylene Blue and Congo red dye as well as kinetics and thermodynamics of adsorption processes were examined. The dye concentration for Congo red and‎ Methylene blue dyes in different samples was measured using 498 nm and 664 nm ‎ wavelength spectrophotometer, respectively. The experimental results showed that gamma alumina nanoparticles had a good potential for removing dye molecules. Batch adsorption study revealed that 0.04 g amount of the adsorbent was capable of removing 75.67% of Congo red (CR) and 0.05g of the adsorbent was capable of removing 78.25% of Methylene blue (MB) in 40 min. The experimental equilibrium data showed that Langmuir isotherm applied well for describing the adsorption behaviour and Kinetic studies showed best applicability of the second-order kinetic model. The results of gamma alumina nanoparticles showed synthetic alumina was found as an efficient adsorbent for the absorption of aqueous blue dyes.