Effective Copper and Methylene blue adsorption from industrial effluents onto activated carbons prepared from Rice husk ash and Hazelnut husks modified by Diopside: Equilibrium, Kinetics, and Experimental design

Activated carbon from rice husk ash (AC-RH) and hazelnut husks (AC-HH) modified by Diopside (AC-RH/Diop, AC-HH/Diop) composites were synthesised applied for the adsorption of Copper Methylene blue industrial effluents. was provided sol-gel method activated prepared husks. The formation AC/Diop characterised FT-IR, FESEM, BET, XRD analyses. Effects pH, amount adsorbent, contact time at 10 mg L−1 on removal percentage studied Box Behnken design (BBD). Optimal conditions maximum MB adsorbent (95.54% 99.42%, respectively) as follows: (pH = 5.45, 7.35) (adsorbent amount: 0.10, 0.45 g), (contact time: 9.56, 13.49 min) in 20 mL pollutants concentration, respectively. In addition, kinetics, thermodynamics, isotherms examined. Adsorption (qmax: 184.25 289.51 g−1 MB, kinetics demonstrated that sorption processes better described Langmuir pseudo-second-order equation.