Statistical physics double-layer models for the experimental study and theoretical modeling of methyl orange dye adsorption on AlMnTiO nanocomposite

A Al2O3/MnO2/TiO2 (AlMnTiO) nanocomposite was synthesized using the thermal coprecipitation method and the adsorption performance of methyl orange (MO) dye from aqueous solution was carried out. Single-parameter optimization was used to explore the properties of AlMnTiO nanocomposite parameters on dye adsorption, including dose of adsorbent, solution pH, contact duration, and starting MO concentration. The model is the appropriate adsorption isotherm for the equilibrium process using a pseudo-second-order kinetic model property. Langmuir plot had a Q(max) (mg/g) of 198.4 and best fitted (R-2=0.990) among different isotherm models. The relevant parameters were computed using the dual-energy binary-layer statistical physics model. The statistical physics binary-layer model yield n (stoichiometric coefficient) values of 0.410, 0.440, and 0.453, all values are below 1, demonstrating the multi-docking process. AlMnTiO nanocomposite was regenerated up to six times, making the material extremely cost-effective. Using AlMnTiO nanocomposite, MO dye was removed from wastewater both in the laboratory and on the industrial scale.

Automated summary

A Al2O3/MnO2/TiO2 (AlMnTiO) nanocomposite was synthesized and its adsorption performance for methyl orange (MO) dye was investigated. The effects of various parameters, including adsorbent dose, solution pH, contact duration, and starting MO concentration, on dye adsorption were explored using single-parameter optimization. The Langmuir plot provided the best fit (R-2=0.990) with a maximum adsorption capacity (Q(max)) of 198.4 mg/g. The statistical physics binary-layer model revealed a multi-docking process with stoichiometric coefficient (n) values below 1 (0.410, 0.440, and 0.453). The AlMnTiO nanocomposite showed excellent recyclability, being able to be regenerated up to six times. It effectively removed MO dye from wastewater in laboratory-scale and industrial-scale experiments.