Preparation and characterization of SnO2-CeO2 nanocomposites: Sorption, modeling and kinetics for azorubine dye removal in water

• Published in: Journal of molecular liquids Vol. 346; p. 117119
• Main Authors: Ali, Imran, Kon'kova, Tatiana, Liberman, Elena, Simakina, Ekaterina, ALOthman, Zeid A., Alomar, Taghrid S., Ataul Islam, Mohammad
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.01.2022
• Subjects: Azorubine dye removal; Kinetics of azorubine adsorption; SnO2-CeO2 nanocomposite materials; Wastewater treatment; SnO2-CeO2 nanocomposite materials; Azorubine dye removal; Wastewater treatment; Kinetics of azorubine adsorption
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2021.117119

[Display omitted] •Synthesis and characterization of SnO2-CeO2 nanocomposites.•Fast removal of azorubine dye (96.1%) in water within 20 min by nanocomposites.•Excellent dye removal capacity of nanocomposites up to 6 regeneration cycles.•Method is economic and effective for the removal of azorubine at large scale. SnO2-CeO2 nanocomposite materials (0.1SnO2–0.9CeO2, 0.15SnO2–0.85CeO2, 0.2SnO2–0.8CeO2, and 0.3SnO2–0.7CeO2) were prepared by co-precipitation in a water-isopropanol solution followed by thermal treatment. The materials were characterized by EDX, TEM, XRD and low-temperature nitrogen adsorption and used for comparative removing dye azorubine in water. It was shown that 0.15SnO2-0.85CeO2 solid solution; based on the crystal lattice of cerium dioxide; had a 15 mol % content of tin. The material was nearly spherical particles of size 8–10 nm. The adsorption followed Langmuir, Freundlich, Temkin, Flory-Higgins, Dubinin-Radushkevich isotherms and kinetics pseudo-first-order, pseudo-second-order, Elovich-Chen-Clayton, Boyd, and Vebber-Morris models. The Ho and Langmuir models were most adequately described the process of azorubine adsorption. The maximum adsorption of azorubine (96.1%) was achieved with 20 min of contact time, pH 6, azorubine concentration 20 mg/L and adsorbent dose 1.0 g/L. The regeneration of the adsorbent was achieved by catalytic oxidative destruction of azorubine with hydrogen peroxide. The reported adsorbent had an exceptional capability to remove azorubine in water with the loss of about 10 % adsorption capacity after running 6 times. The reported process may be assumed as an effective method for the removal of azorubine from water with the economy due to the absence of wastewater during the regeneration of the adsorbent.