Sustainable Remedy Waste to Generate SiO 2 Functionalized on Graphene Oxide for Removal of U(VI) Ions.

The Hummer process is applied to generate graphene oxide from carbon stocks' discharged Zn-C batteries waste. SiO₂ is produced from rice husks through the wet process. Subsequently, SiO₂ reacted with graphene oxide to form silica/graphene oxide (SiO₂/GO) as a sorbent material. XRD, BET, SEM, EDX, and FTIR were employed to characterize SiO₂/GO. Factors affecting U(VI) sorption on SiO₂/GO, including pH, sorption time, a dosage of SiO₂/GO, U(VI) ions' concentration, and temperature, were considered. The experimental data consequences indicated that the uptake capacity of SiO₂/GO towards U(VI) is 145.0 mg/g at a pH value of 4.0. The kinetic calculations match the pseudo second-order model quite well. Moreover, the sorption isotherm is consistent with the Langmuir model. The sorption procedures occur spontaneously and randomly, as well as exothermically. Moreover, SiO₂/GO has essentially regenerated with a 0.8 M H₂SO₄ and 1:50 S:L phase ratio after 60 min of agitation time. Lastly, the sorption and elution were employed in seven cycles to check the persistent usage of SiO₂/GO. [ABSTRACT FROM AUTHOR]