Abstract
A new SnO2/CeO2 nano-composite catalyst was synthesized, characterized and used for the removal of alizarin dyes from aqueous solutions. The composite material was prepared using a precipitation method. X-ray powder diffractometry (XRD), high resolution transmission electron microscopy (HR-TEM), Brunauer–Emmett–Teller methodology (BET) and Fourier Transform Infrared Spectrometry (ATR-FTIR) were utilized for the characterization of the prepared composite. The prepared nano-composite revealed high affinity for the adsorption and decomposition of alizarin dyes. The adsorption capacity under different experimental conditions (adsorbate concentration, contact time, adsorbent dose and pH) was examined. Under optimized experimental conditions, the removal of alizarin yellow, alizarin red and alizarin-3-methylimino-diacetic acid dyes from aqueous solutions was about 96.4%,87.8% and 97.3%, respectively. The adsorption isotherms agreed with the models of Langmuir, Freundlich and Temkin isotherms.
Highlights
The lack of water resources requires humanity to save each drop of it, but there are plenty of pollutants that may affect the quality of the water resources
The prepared composite was characterized using high-resolution transmission electron microscopy (HR-TEM) using Jeol 2100 (Osaka, Japan), X-ray powder diffractometry (XRD) using X’Pert PRO, PANalytical (Amsterdam, The Netherlands) with CuKα radiation (λ = 0.154060 nm) in the angular region of 2θ = 4–80◦ operated at 40 KV and 40 mA
Tin oxide/cerium oxide (SnO2/CeO2) nano-composite materials consisting of 93–97% SnO2 and 7–3% CeO2 were prepared and characterized
Summary
The lack of water resources requires humanity to save each drop of it, but there are plenty of pollutants that may affect the quality of the water resources. The contamination of water resources with dyes is an important source of pollution. Many industries use dyes during processing of their products such as textiles, dyestuff, distilleries, tanneries, paper, rubber, plastics, leather, cosmetics, food and pharmaceuticals for the coloration of their products. Effluents from these industries commonly contain dye residue. Ion-exchange methods [5,6], photocatalysis [7,8,9,10], the electro-Fenton process [11] and adsorption methods [12,13,14,15,16,17,18,19,20,21] are commonly used techniques for the removal of this group of dyes.
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