Adsorption of Methyl Orange onto Perlite: Optimization, Adsorption Kinetics, and Thermodynamic Studies

In this work, the methyl orange (MO) dye adsorption has been occurred onto expanded Perlite. The optimization study has been conducted using the CCD method and STATISTICA 12.0 software. The optimum conditions generated were: 115 min, 65 mg/L and 311 K for the contact time, MO concentration and temperature, respectively. The highest MO removal was 82.22% and 195.27 mg/g as adsorption yield Y and adsorption capacity Q, respectively. The kinetic study shows that the adequate models were PSO and IPD. These models suggest not only a limited adsorption process but also demonstrated that the adsorbent surface was heterogeneous into porous adsorbents. The isotherm study adds a monolayer MO adsorption process. The thermodynamic study approves a spontaneous, endothermic physisorption process. The EDS analysis shows that the perlite particles were covered by the MO dye. The SEM, EDS mapping and FTIR analysis approves the MO adsorption onto Perlite. [GRAPHICS] .

Automated summary

In this study, the adsorption of methyl orange dye onto expanded Perlite was investigated. The optimal conditions for contact time, dye concentration and temperature were determined to be 115 min, 65 mg/L and 311 K, respectively. The highest adsorption yield and capacity were found to be 82.22% and 195.27 mg/g, respectively. Kinetic, isotherm and thermodynamic studies revealed the adsorption process characteristics. EDS, SEM and FTIR analysis confirmed the adsorption of MO onto Perlite.