Abstract
In this paper, the effect of SnO2 impurity on the surface charge and adsorption properties of TiO2 samples is investigated. The experimental value of the zero charge point for TiO2 with 3%, 6% and 12% of SnO2 equals 3.53, 3.97 and 3.2, respectively. The adsorption activity of the samples was studied on model solutions of the anionic dye – Congo red. The maximum adsorption capacity (qexp) equals 24.6 mg/g for 3Sn/TiO2, 25.0 mg/g for 6Sn/TiO2 and 39.1 mg/g for 12Sn/TiO2. Langmuir, Freundlich, and Dubinin-Radushkevich models were used to describe the adsorption mechanism of Congo red dye on the surface of Sn/TiO2 samples. Based on the results of the studies of Congo red adsorption by the surface of titanium dioxide doped with Sn, all samples agree best with the Langmuir model. The correlation coefficients for the Langmuir isotherms are in the range of 0.9927 - 0.9996, while the values of R2 for the Freundlich and Dubinin-Radushkevich isotherms are in the range of 0.721 - 0.8329 and 0.8283 - 0.9433, respectively. Experimental data obtained from adsorption isotherms show that the TiO2 sample containing 12% SnO2 is the most active. The best result of Congo red removal occurred at a concentration of Co = 5 mg/l (% of removed dye ≈ 83% for 12Sn/TiO2; 81% for 6Sn/TiO2 and 71% for 3Sn/TiO2). Therefore, the studied samples of TiO2 doped with SnO2 can be used as effective adsorbents of Congo red from aqueous solutions.
Highlights
In the modern world, where science is constantly and rapidly developing, much attention is paid to the study of oxide nanomaterials with important chemical and physical properties
The aim of this study is to investigate the TiO2 samples doped with SnO2 as effective adsorbents of azo dye Congo red from aqueous solutions
1.2.2 Adsorption of Congo red The adsorption properties of Sn/TiO2 samples were investigated in a neutral medium of dye solutions
Summary
In the modern world, where science is constantly and rapidly developing, much attention is paid to the study of oxide nanomaterials with important chemical and physical properties. Depending on the choice of PEG used as the agent controlling the structure of the nanomaterial, the values of the maximum adsorption capacity of Pb(II) and Cd(II) ranged from 769 – 857 mg/g and 667 – 770 mg/g, respectively Such results were obtained by adding 0.02 g of adsorbent to 100 ml of metal ion solution (C = 10 – 50 mg/l), stirring at 200 rpm and determining the concentration of the solution. The studies were performed at 30 °C while stirring at 150 rpm for 4 hours, and the maximum concentration of azo dye solutions equaled 20 mg/L The results of this experiment revealed that the maximum adsorption capacity of the samples to remove the Direct Green 99 dye equals 97.09 mg/g, and in case of Reactive Red 198, qe equals 42.55 mg/g, which is half the first value. The aim of this study is to investigate the TiO2 samples doped with SnO2 as effective adsorbents of azo dye Congo red from aqueous solutions
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