Performance assessment of five adsorbents based on fly ash for removal of cadmium ions

Five adsorbents based on fly ash treated with NaOH for the adsorption of cadmium ion from aqueous solutions were investigated. The materials characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and Brunauer-Emmett-Teller (BET) surface area methods. results demonstrated that specific was improved after treatment, by new reached equilibrium in less than 120 min. also confirmed solution direct activation had a higher capacity untreated ash. maximum capacities obtained range 9.18–48.5 mg/g. Also, SEM/EDS FT-IR Cd(II) loaded performed. experimental data used kinetics determination three model equations: pseudo first-order model, second-order intraparticle diffusion model. Was found ions onto studied follows isotherms adsorbent synthesized 15 h 5 M at 90 °C ratio 1:3 ash: (A5) assessed terms Langmuir (four types linearization), Freundlich, Temkin, Harkin-Jura, Halsey models. effectiveness evaluated toxicity characteristic leaching (TCLP) procedure. Accordingly, proposed methods this study are recommended advanced capitalization ash, particularly as potential removal wastewater.