Synthesis, characterization and application of composite derived from rice husk ash with aluminium oxide for sorption of uranium

Abstract

A composite of rice husk (RH), caustic soda and aluminium oxide was synthesized at 500 C. The activated carbon and amorphous silica dispersed over the aluminium oxide selectively adsorbed uranium in the presence of other elements. At equilibrium time 1 h, phase ratio S/L (0.1 g/10 ml), pH ¼ 5 and uranium initial concentration 120.6 mg/l uranium adsorption efficiency was 96.35%. The uranium stripping efficiency from the load RHA-alumina composite fulfilled 99.9% at 1 h equilibrium time, a phase ratio (S/A) of 0.05 g/10 ml and 0.5 mol/l HNO 3 . The scanning electron microscopy photos revealed that the rice husk ash (RHA)-alumina composite has vacant or regular cavities before the adsorption, and the cavities are fully occupied by uranium after adsorption. The Fourier transform infrared spectroscopy shows a more broadening of the band t ¼ 3526 and 3462 cm À1 which was ascribed to the uranium adsorption. The composite adsorbed 93.75% of uranium from a waste sample. The uranium adsorption exhibited a Langmuir isotherm.

Adsorption of heavy metal onto biomass-derived activated carbon: review

“…The adsorption efficiency of uranium was 96.35% at an equilibrium time of 1 h, and an initial uranium concentration of 121 mg L −1 . 66 Activated alumina also shows good adsorption properties due to its high pore surface activity and affinity for water. 67 Zeolite also showed excellent adsorption properties.…”

Thermal activation of kaolinite titanium hydroxide composite for uranium adsorption from aqueous solutions

“…( 5):. where: q e : the amount of uranium adsorbed per unit mass of KT composite ( mg g −1 ), q m : defined as the theoretical loading capacity for uranium (mg g −1 ), K: is defined as a constant related to the adsorption energy (mol 2 kJ −2 ), ε: is defined as the adsorption potential (kJ mol −1 ) and is calculated from equation ε = RT ln (1 + 1/Ce) (Youssef et al 2018). The main advantage of the Dubinin-Radushkevich model is the determination of adsorption energy E depending on K (constant of the adsorption energy) value, where E = 1/ (2 K) 1/2 .…”

Study of sorption properties of zirconia, alumina, and silica in relation to repellents

“…It is known that synthesized ZrO 2 and Al 2 O 3 possess high sorption properties [17][18][19][20][21][22][23][24][25][26]. Their unique properties, such as large surface area, large pore volume, high porosity, high physical and chemical stability, make them stand out among other sorbents [17].…”