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Keywords = ammonium molybdophosphate

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13 pages, 1856 KiB  
Article
Investigation of the Segregation of Radiocesium from Contaminated Aqueous Waste Using AMP-PAN Extraction Chromatography
by Taisir Khudhair Abbas, Thaeerh Tariq Abdulghafoor, Ali Hassan Aziz, Saad Al-Saadi, Takrid Munam Nafae, Khalid Turki Rashid and Qusay F. Alsalhy
Energies 2023, 16(18), 6544; https://doi.org/10.3390/en16186544 - 12 Sep 2023
Cited by 5 | Viewed by 2008
Abstract
Removing the hazardous and unstable radioactive isotopes has been considered an arduous task, though they are in minimal concentrations. Cesium-137 (137Cs+) is a primary fission product produced by nuclear processes. Even at low concentrations, such radioactive material is a [...] Read more.
Removing the hazardous and unstable radioactive isotopes has been considered an arduous task, though they are in minimal concentrations. Cesium-137 (137Cs+) is a primary fission product produced by nuclear processes. Even at low concentrations, such radioactive material is a menacing source of contaminants for the environment. The current study aims to separate 137Cs+ from a real contaminated aqueous solution via an ion exchange mechanism using ammonium molybdophosphate–polyacrylonitrile (AMP-PAN) resin loaded in an extraction chromatographic column that possesses considerable selectivity toward cesium ion (Cs+) due to the specific ion exchange between 137Cs+ and NH4+. Additionally, the proposed interaction mechanism between 137Cs+ with APM-PAN resin has been illustrated in this study. The results disclosed that the optimum efficient removal of 137Cs+ (91.188%) was obtained by the AMP-PAN resin using 2 g·L−1, while the distribution adsorption coefficient (129.359 mL·g−1) was at pH 6. The isothermal adsorption process was testified through the Langmuir and Freundlich models. The estimated maximum adsorption capacity reached 140.81 ± 21.3 mg·g−1 for the Freundlich isotherm adsorption model. Finally, AMP-PAN resin could eliminate 137Cs+ from water effectively through adsorption. Full article
(This article belongs to the Special Issue Advanced Multi-Physics Modeling, Simulation, and Optimization for Nuclear Technology)
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17 pages, 5358 KiB  
Article
Adsorption Behavior and Mechanism of Cesium Ions in Low-Concentration Brine Using Ammonium Molybdophosphate–Zirconium Phosphate on Polyurethane Sponge
by Hao Wang, Guihua Ma, Ke Zhang, Zhi Jia, Yuzhuo Wang, Li Gao and Bingxin Liu
Materials 2023, 16(13), 4583; https://doi.org/10.3390/ma16134583 - 25 Jun 2023
Cited by 4 | Viewed by 1585
Abstract
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+ as a special adsorbent. Nevertheless, their high [...] Read more.
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+ as a special adsorbent. Nevertheless, their high solubility in water leads to a decrease in their ability to adsorb Cs+ 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+ 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+ 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+ adsorbent provides design guidelines. Full article
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