Adsorption Behavior and Mechanism of Cesium Ions in Low-Concentration Brine Using Ammonium Molybdophosphate–Zirconium Phosphate on Polyurethane Sponge
Salt lake brine originating from Qinghai, China has abundant cesium resources and huge total reserves. The inorganic ion exchangers ammonium molybdophosphate (AMP) and zirconium phosphate (ZrP) have the significant advantages of separating and extracting Cs<sup>+</sup> as a special adsor...
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2023-06-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/13/4583 |
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| author | Hao Wang Guihua Ma Ke Zhang Zhi Jia Yuzhuo Wang Li Gao Bingxin Liu |
| author_facet | Hao Wang Guihua Ma Ke Zhang Zhi Jia Yuzhuo Wang Li Gao Bingxin Liu |
| author_sort | Hao Wang |
| collection | DOAJ |
| description | Salt lake brine originating from Qinghai, China has abundant cesium resources and huge total reserves. The inorganic ion exchangers ammonium molybdophosphate (AMP) and zirconium phosphate (ZrP) have the significant advantages of separating and extracting Cs<sup>+</sup> as a special adsorbent. Nevertheless, their high solubility in water leads to a decrease in their ability to adsorb Cs<sup>+</sup> in aqueous solutions, causing problems such as difficulty with using adsorbents alone and a difficult recovery. In this work, an environmentally friendly polyurethane sponge (PU sponge) with a large specific surface area is employed as an adsorbent carrier by physically impregnating dopamine-coated AMP and ZrP onto a PU sponge, respectively. The experiment found that under the same conditions, the AMP/PU sponge performs better than the ZrP/PU sponge for Cs<sup>+</sup> adsorption. When the amount of adsorbent reaches 0.025 g, the adsorption capacity reaches saturation. The adsorption efficiency remains above 80% when the concentration of Cs<sup>+</sup> is 5–35 mg/L. The kinetic calculations show that adsorption is spontaneous, feasible, and has a higher driving force at high temperatures. In addition, the power and mechanism of the interaction between adsorbent and adsorbent are explained using the density functional theory calculation. This efficient, stable, and selective Cs<sup>+</sup> adsorbent provides design guidelines. |
| first_indexed | 2024-03-11T01:35:49Z |
| format | Article |
| id | doaj.art-11ef2be9ac834e229c886a0b4b16832a |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T01:35:49Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-11ef2be9ac834e229c886a0b4b16832a2023-11-18T16:56:53ZengMDPI AGMaterials1996-19442023-06-011613458310.3390/ma16134583Adsorption Behavior and Mechanism of Cesium Ions in Low-Concentration Brine Using Ammonium Molybdophosphate–Zirconium Phosphate on Polyurethane SpongeHao Wang0Guihua Ma1Ke Zhang2Zhi Jia3Yuzhuo Wang4Li Gao5Bingxin Liu6School of Mechanical Engineering, Qinghai University, Xining 810016, ChinaSchool of Mechanical Engineering, Qinghai University, Xining 810016, ChinaSchool of Mechanical Engineering, Qinghai University, Xining 810016, ChinaSchool of Mechanical Engineering, Qinghai University, Xining 810016, ChinaSchool of Mechanical Engineering, Qinghai University, Xining 810016, ChinaSchool of Mechanical Engineering, Qinghai University, Xining 810016, ChinaSchool of Mechanical Engineering, Qinghai University, Xining 810016, ChinaSalt lake brine originating from Qinghai, China has abundant cesium resources and huge total reserves. The inorganic ion exchangers ammonium molybdophosphate (AMP) and zirconium phosphate (ZrP) have the significant advantages of separating and extracting Cs<sup>+</sup> as a special adsorbent. Nevertheless, their high solubility in water leads to a decrease in their ability to adsorb Cs<sup>+</sup> in aqueous solutions, causing problems such as difficulty with using adsorbents alone and a difficult recovery. In this work, an environmentally friendly polyurethane sponge (PU sponge) with a large specific surface area is employed as an adsorbent carrier by physically impregnating dopamine-coated AMP and ZrP onto a PU sponge, respectively. The experiment found that under the same conditions, the AMP/PU sponge performs better than the ZrP/PU sponge for Cs<sup>+</sup> adsorption. When the amount of adsorbent reaches 0.025 g, the adsorption capacity reaches saturation. The adsorption efficiency remains above 80% when the concentration of Cs<sup>+</sup> is 5–35 mg/L. The kinetic calculations show that adsorption is spontaneous, feasible, and has a higher driving force at high temperatures. In addition, the power and mechanism of the interaction between adsorbent and adsorbent are explained using the density functional theory calculation. This efficient, stable, and selective Cs<sup>+</sup> adsorbent provides design guidelines.https://www.mdpi.com/1996-1944/16/13/4583Cs<sup>+</sup> adsorptionpolyurethane spongeammonium molybdophosphatezirconium phosphate |
| spellingShingle | Hao Wang Guihua Ma Ke Zhang Zhi Jia Yuzhuo Wang Li Gao Bingxin Liu Adsorption Behavior and Mechanism of Cesium Ions in Low-Concentration Brine Using Ammonium Molybdophosphate–Zirconium Phosphate on Polyurethane Sponge Materials Cs<sup>+</sup> adsorption polyurethane sponge ammonium molybdophosphate zirconium phosphate |
| title | Adsorption Behavior and Mechanism of Cesium Ions in Low-Concentration Brine Using Ammonium Molybdophosphate–Zirconium Phosphate on Polyurethane Sponge |
| title_full | Adsorption Behavior and Mechanism of Cesium Ions in Low-Concentration Brine Using Ammonium Molybdophosphate–Zirconium Phosphate on Polyurethane Sponge |
| title_fullStr | Adsorption Behavior and Mechanism of Cesium Ions in Low-Concentration Brine Using Ammonium Molybdophosphate–Zirconium Phosphate on Polyurethane Sponge |
| title_full_unstemmed | Adsorption Behavior and Mechanism of Cesium Ions in Low-Concentration Brine Using Ammonium Molybdophosphate–Zirconium Phosphate on Polyurethane Sponge |
| title_short | Adsorption Behavior and Mechanism of Cesium Ions in Low-Concentration Brine Using Ammonium Molybdophosphate–Zirconium Phosphate on Polyurethane Sponge |
| title_sort | adsorption behavior and mechanism of cesium ions in low concentration brine using ammonium molybdophosphate zirconium phosphate on polyurethane sponge |
| topic | Cs<sup>+</sup> adsorption polyurethane sponge ammonium molybdophosphate zirconium phosphate |
| url | https://www.mdpi.com/1996-1944/16/13/4583 |
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