Highly Efficient Cd<sup>2+</sup> Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution
Cadmium (Cd), as a type of heavy metal, can increase the incidence of many diseases, even in low concentrations. In this study, tobermorite was hydrothermally synthesized and then applied to adsorb Cd<sup>2+</sup> from an aqueous solution. The physicochemical characteristics of the synth...
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2023-02-01
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| author | Juan Qin Sujuan Yuan Mauricio Córdova-Udaeta Keishi Oyama Chiharu Tokoro |
| author_facet | Juan Qin Sujuan Yuan Mauricio Córdova-Udaeta Keishi Oyama Chiharu Tokoro |
| author_sort | Juan Qin |
| collection | DOAJ |
| description | Cadmium (Cd), as a type of heavy metal, can increase the incidence of many diseases, even in low concentrations. In this study, tobermorite was hydrothermally synthesized and then applied to adsorb Cd<sup>2+</sup> from an aqueous solution. The physicochemical characteristics of the synthesized tobermorite were detected, and the results indicated that the well-crystallized tobermorite had a lot of mesopores and a large specific surface area of 140.92 m<sup>2</sup>/g. It acquired a pH self-adjustment ability via spontaneously releasing Ca<sup>2+</sup> and OH<sup>-</sup> into the aqueous solution. The effects of different factors on Cd<sup>2+</sup> removal were investigated. For Cd<sup>2+</sup>, the removal efficiency could reach 99.71% and the maximum adsorption capacity was 39.18 mg/g using tobermorite. The adsorption data was best fitted with the pseudo-second-order kinetic and Langmuir isotherm models. In addition, there was no strict limit on the solution pH in Cd<sup>2+</sup> adsorption because the tobermorite could adjust the solution pH to an alkaline atmosphere spontaneously. The efficient removal of Cd<sup>2+</sup> using tobermorite was a result of surface complexation and ion exchange. |
| first_indexed | 2024-03-11T09:35:52Z |
| format | Article |
| id | doaj.art-ba62665300734b95bc8baed6b69b0d1c |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T09:35:52Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
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| spelling | doaj.art-ba62665300734b95bc8baed6b69b0d1c2023-11-16T17:20:13ZengMDPI AGMaterials1996-19442023-02-01163131410.3390/ma16031314Highly Efficient Cd<sup>2+</sup> Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous SolutionJuan Qin0Sujuan Yuan1Mauricio Córdova-Udaeta2Keishi Oyama3Chiharu Tokoro4School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, ChinaSchool of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, ChinaFaculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, JapanFaculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, JapanFaculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, JapanCadmium (Cd), as a type of heavy metal, can increase the incidence of many diseases, even in low concentrations. In this study, tobermorite was hydrothermally synthesized and then applied to adsorb Cd<sup>2+</sup> from an aqueous solution. The physicochemical characteristics of the synthesized tobermorite were detected, and the results indicated that the well-crystallized tobermorite had a lot of mesopores and a large specific surface area of 140.92 m<sup>2</sup>/g. It acquired a pH self-adjustment ability via spontaneously releasing Ca<sup>2+</sup> and OH<sup>-</sup> into the aqueous solution. The effects of different factors on Cd<sup>2+</sup> removal were investigated. For Cd<sup>2+</sup>, the removal efficiency could reach 99.71% and the maximum adsorption capacity was 39.18 mg/g using tobermorite. The adsorption data was best fitted with the pseudo-second-order kinetic and Langmuir isotherm models. In addition, there was no strict limit on the solution pH in Cd<sup>2+</sup> adsorption because the tobermorite could adjust the solution pH to an alkaline atmosphere spontaneously. The efficient removal of Cd<sup>2+</sup> using tobermorite was a result of surface complexation and ion exchange.https://www.mdpi.com/1996-1944/16/3/1314tobermoritepH self-adjustmentcadmiumcalciumadsorption |
| spellingShingle | Juan Qin Sujuan Yuan Mauricio Córdova-Udaeta Keishi Oyama Chiharu Tokoro Highly Efficient Cd<sup>2+</sup> Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution Materials tobermorite pH self-adjustment cadmium calcium adsorption |
| title | Highly Efficient Cd<sup>2+</sup> Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution |
| title_full | Highly Efficient Cd<sup>2+</sup> Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution |
| title_fullStr | Highly Efficient Cd<sup>2+</sup> Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution |
| title_full_unstemmed | Highly Efficient Cd<sup>2+</sup> Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution |
| title_short | Highly Efficient Cd<sup>2+</sup> Removal Using Tobermorite with pH Self-Adjustment Ability from Aqueous Solution |
| title_sort | highly efficient cd sup 2 sup removal using tobermorite with ph self adjustment ability from aqueous solution |
| topic | tobermorite pH self-adjustment cadmium calcium adsorption |
| url | https://www.mdpi.com/1996-1944/16/3/1314 |
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