Adsorption of methyl orange and alizarin red S on mesoporous titanium dioxide doped with lanthanum
Abstract
Adsorption is one of the effective methods for the purification of aqueous media from pollutants. An urgent problem is the modification and doping of the structure of TiO2, which improves its adsorption characteristics. The aim of this study was the investigation of the effect of lanthanum on the adsorption characteristics of titanium dioxide during the adsorption of methyl orange and alizarin red S.
Using the template synthesis method, samples of mesoporous titanium dioxide doped with various amounts of lanthanum were obtained – 2.2 wt.%, 9.5 wt.% and 17.9 wt.% – La(2.2)/TiO2, La(9.5)/TiO2, La(17.9)/TiO2 respectively, and a sample of undoped TiO2 was used. The obtained materials were studied using X-ray phase analysis and the low-temperature adsorption-desorption of nitrogen. The adsorption properties of the obtained titanium dioxides were studied based on the example of adsorption from aqueous solutions of methyl orange and alizarin red S.
The diffraction patterns of the synthesized samples contained only reflexes characteristic of the TiO2 phase of anatase type. It was shown that the doping of TiO2 with lanthanum led to a decrease in the size of crystallites in comparison with the size of the undoped sample. Doping the sample with lanthanum allowed increasing the specific surface area of materials from 67 m2/g for an undoped sample, up to 104-108 m2/g for doped samples. Doping with lanthanum improved the adsorption properties of the resulting doped La/TiO2 samples, compared to undoped TiO2. The best adsorption of methyl orange and alizarin red S was revealed for the La(2.2)/TiO2 sample, which is consistent with its highest pore volume compared to other samples. The adsorption of methyl orange on La(2.2)/TiO2 after 3 hours was 66%, the complete adsorption of alizarin red S from its aqueous solution occurred after 2 hours from the start of the process.
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