Adsorption of Co(II) from aqueous solutions onto rice husk modified by ultrasound assisted and supercritical technologies

作者：Franco Dison S P; Cunha Jeanine M; Dortzbacher Gabriel F; Dotto Guilheryne L

来源：Process Safety and Environmental Protection, 2017, 109: 55-62.

DOI：10.1016/j.psep.2017.03.029

• Adsorption
• BET model
• Cobalt
• Rice husk
• Ultrasound assisted
• Supercritical CO2

Rice husk was modified by ultrasound assisted (UA) and supercritical CO2 (SCO2) technologies, to improve its adsorption characteristics regarding to Co(II). The Co(II) adsorption was studied with respect to the pH effect, kinetic curves and equilibrium isotherms. The UA and SCO2 treatments provided increases of 7 and 4 times in the surface area, respectively. The maximum experimental adsorption capacities were 17.6, 20.8 and 35.0 mg g(-1), for raw rice husk, SCO2-rice husk and UA-rice husk, respectively. These results demonstrated that mainly the ultrasound assisted technology was adequate to improve the rice husk characteristics for adsorption purposes.

• 出版日期2017-7