Adsorption Capacity of Silica SBA-15 and Titanosilicate ETS-10 toward Indium Ions
Indium is an extremely important element for industry that is distributed in the Earth’s crust at very low concentrations. The recovery of indium by silica SBA-15 and titanosilicate ETS-10 was investigated at different pH levels, temperatures, times of contact and indium concentrations. A maximum re...
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| author | Inga Zinicovscaia Nikita Yushin Doina Humelnicu Dmitrii Grozdov Maria Ignat Ionel Humelnicu |
| author_facet | Inga Zinicovscaia Nikita Yushin Doina Humelnicu Dmitrii Grozdov Maria Ignat Ionel Humelnicu |
| author_sort | Inga Zinicovscaia |
| collection | DOAJ |
| description | Indium is an extremely important element for industry that is distributed in the Earth’s crust at very low concentrations. The recovery of indium by silica SBA-15 and titanosilicate ETS-10 was investigated at different pH levels, temperatures, times of contact and indium concentrations. A maximum removal of indium by ETS-10 was achieved at pH 3.0, while by SBA-15 it was within the pH range of 5.0–6.0. By studying kinetics, the applicability of the Elovich model for the description of indium adsorption on silica SBA-15 was shown, while its sorption on titanosilicate ETS-10 fitted well with the pseudo-first-order model. Langmuir and Freundlich adsorption isotherms were used to explain the equanimity of the sorption process. The Langmuir model showed its applicability for the explanation of the equilibrium data obtained for both sorbents, the maximum sorption capacity obtained using the model constituted 366 mg/g for titanosilicate ETS-10 at pH 3.0, temperature 22 °C and contact time 60 min, and 2036 mg/g for silica SBA-15 at pH 6.0, temperature 22 °C and contact time 60 min. Indium recovery was not dependent on the temperature and the sorption process was spontaneous in nature. The interactions between the indium sulfate structure and surfaces of adsorbents were investigated theoretically using the ORCA quantum chemistry program package. The spent SBA-15 and ETS-10 could be easily regenerated by using 0.01 M HCl and reused with up to 6 cycles of adsorption/desorption with a decrease in the removal efficiency between 4% and 10% for SBA-15 and 5% and 10% for ETS-10, respectively. |
| first_indexed | 2024-03-11T04:47:29Z |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T04:47:29Z |
| publishDate | 2023-04-01 |
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| series | Materials |
| spelling | doaj.art-483070c99e4748ce9cd05bcb2589cfbf2023-11-17T20:14:39ZengMDPI AGMaterials1996-19442023-04-01168320110.3390/ma16083201Adsorption Capacity of Silica SBA-15 and Titanosilicate ETS-10 toward Indium IonsInga Zinicovscaia0Nikita Yushin1Doina Humelnicu2Dmitrii Grozdov3Maria Ignat4Ionel Humelnicu5Department of Nuclear Physics, Joint Institute for Nuclear Research, Joliot-Curie Str., 6, 1419890 Dubna, RussiaDepartment of Nuclear Physics, Joint Institute for Nuclear Research, Joliot-Curie Str., 6, 1419890 Dubna, RussiaFaculty of Chemistry, Alexandru Ioan Cuza University of Iasi, Bld. Carol I, 11, 700506 Iasi, RomaniaDepartment of Nuclear Physics, Joint Institute for Nuclear Research, Joliot-Curie Str., 6, 1419890 Dubna, RussiaFaculty of Chemistry, Alexandru Ioan Cuza University of Iasi, Bld. Carol I, 11, 700506 Iasi, RomaniaFaculty of Chemistry, Alexandru Ioan Cuza University of Iasi, Bld. Carol I, 11, 700506 Iasi, RomaniaIndium is an extremely important element for industry that is distributed in the Earth’s crust at very low concentrations. The recovery of indium by silica SBA-15 and titanosilicate ETS-10 was investigated at different pH levels, temperatures, times of contact and indium concentrations. A maximum removal of indium by ETS-10 was achieved at pH 3.0, while by SBA-15 it was within the pH range of 5.0–6.0. By studying kinetics, the applicability of the Elovich model for the description of indium adsorption on silica SBA-15 was shown, while its sorption on titanosilicate ETS-10 fitted well with the pseudo-first-order model. Langmuir and Freundlich adsorption isotherms were used to explain the equanimity of the sorption process. The Langmuir model showed its applicability for the explanation of the equilibrium data obtained for both sorbents, the maximum sorption capacity obtained using the model constituted 366 mg/g for titanosilicate ETS-10 at pH 3.0, temperature 22 °C and contact time 60 min, and 2036 mg/g for silica SBA-15 at pH 6.0, temperature 22 °C and contact time 60 min. Indium recovery was not dependent on the temperature and the sorption process was spontaneous in nature. The interactions between the indium sulfate structure and surfaces of adsorbents were investigated theoretically using the ORCA quantum chemistry program package. The spent SBA-15 and ETS-10 could be easily regenerated by using 0.01 M HCl and reused with up to 6 cycles of adsorption/desorption with a decrease in the removal efficiency between 4% and 10% for SBA-15 and 5% and 10% for ETS-10, respectively.https://www.mdpi.com/1996-1944/16/8/3201adsorptionindiumsilica SBA-15titanosilicate ETS-10pollutionremediation |
| spellingShingle | Inga Zinicovscaia Nikita Yushin Doina Humelnicu Dmitrii Grozdov Maria Ignat Ionel Humelnicu Adsorption Capacity of Silica SBA-15 and Titanosilicate ETS-10 toward Indium Ions Materials adsorption indium silica SBA-15 titanosilicate ETS-10 pollution remediation |
| title | Adsorption Capacity of Silica SBA-15 and Titanosilicate ETS-10 toward Indium Ions |
| title_full | Adsorption Capacity of Silica SBA-15 and Titanosilicate ETS-10 toward Indium Ions |
| title_fullStr | Adsorption Capacity of Silica SBA-15 and Titanosilicate ETS-10 toward Indium Ions |
| title_full_unstemmed | Adsorption Capacity of Silica SBA-15 and Titanosilicate ETS-10 toward Indium Ions |
| title_short | Adsorption Capacity of Silica SBA-15 and Titanosilicate ETS-10 toward Indium Ions |
| title_sort | adsorption capacity of silica sba 15 and titanosilicate ets 10 toward indium ions |
| topic | adsorption indium silica SBA-15 titanosilicate ETS-10 pollution remediation |
| url | https://www.mdpi.com/1996-1944/16/8/3201 |
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