Kinetic, Isotherm, and Thermodynamic Studies of the Adsorption of Methyl Orange from Aqueous Solution by Chitosan/Alumina Composite

Abstract

Alumina, a support material, was loaded with chitosan to form a chitosan/alumina composite (CA) and was utilized for removing sulfonated azo-dye methyl orange (MO) from aqueous media in this study. The adsorbents were characterized by Fourier transform infrared (FTIR) spectra to confirm that chitosan was successfully immobilized on alumina, and some functional groups were successfully introduced into the surface of alumina after modification. The effects of pH, the amount of adsorbent, initial concentration, time, and temperature were studied in batch experiments. The experimental data were analyzed by Langmuir and Freundlich adsorption isotherms. Thermodynamic parameters such as ΔG o , ΔH o , and ΔS o have also been evaluated, and it has been found that the sorption process was spontaneous and exothermic in nature. Pseudofirst-order and pseudosecond-order kinetic models were used to fit the experimental data. Kinetic parameters, rate constants, equilibrium adsorption capacities, and related correlation coefficients for each kinetic model were calculated and discussed. It revealed that the adsorption of MO could be described by the pseudosecond-order equation, suggesting that the adsorption process is presumably chemisorption.

Removal of methylene blue (aq) using untreated and acid‐treated eucalyptus leaves and GA‐ANN modelling

“…Figure c also depicts that PEUL has a higher percentage of removal of MB over the EUL and SEUL bio‐adsorbents. Initially, the percentage of removal is higher due to the availability of the adsorbent sites and then it is reduced as a result of the saturation of the sites and the pore diffusion becomes slow …”

Fe3O4@C particles synthesized with iron‐containing water treatment residuals and its potential for methylene blue removal

“…Thus, it is extremely important and a necessity to treat dyed industrial wastewater to prevent people or animals from being harmed. Therefore, a number of technologies have been developed to remove MB from effluent, such as degradation, ultrafiltration, electrochemical treatment, ozonation, ion exchange and adsorption …”

Removal and Spectrophotometric Determination of Anionic Dye Using a Polymeric Nanocomposite

“…The initial dye concentration offers the necessary driving force to overwhelm the mass transfer resistance of dye molecules between the aqueous phase and the solid phase. Similar trends have been reported for the sorption of MO onto mesoporous carbon material, activated carbon and chitosan/alumina composite …”

“…This suggested that the MO sorption onto PUF/AgNPs could be appropriately represented by a pseudo‐second‐order rate process. Analogous results were obtained for the sorption MO onto various sorbents …”

“…Similar trends have been reported for the sorption of MO onto mesoporous carbon material, 32 activated carbon 33 and chitosan/alumina composite. 34…”