Artykuły w czasopismach: „Strontium Adsorption”

1

Yakout, Sobhy M., Mohamed R. Hassan i Mohamed I. Aly. "Synthesis of magnetic alginate beads based on magnesium ferrite (MgFe2O4) nanoparticles for removal of Sr (II) from aqueous solution: kinetic, equilibrium and thermodynamic studies". Water Science and Technology 77, nr 11 (17.05.2018): 2714–22. http://dx.doi.org/10.2166/wst.2018.228.

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Abstract Novel magnetic alginate beads (MagAlgbeads) have been developed by incorporation of magnesium ferrite (MgFe2O4) in alginate beads with the aim of using them in the removal of strontium from aqueous solution. MagAlgbeads were characterized by transmission electron microscopy, scanning electron microscopy, X-ray fluorescence and Fourier transform infrared spectroscopy. The adsorption of strontium onto MagAlgbeads were found to depend on pH and strontium removal increases with increasing pH until pH is 6. Strontium adsorption kinetics run through pseudo-second-order model. Thermodynamically, strontium adsorption was endothermic and spontaneous. Langmuir isotherm gave good fitting for strontium removal with adsorption capacity of 505.5 mg/g. These results proved that the prepared MagAlgbeads are very efficient material for strontium adsorption.

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Qadeer, Riaz, Javed Hanif, Muhammad Saleem i Muhammad Afzal. "Selective Adsorption of Strontium on Activated Charcoal from Electrolytic Aqueous Solutions". Collection of Czechoslovak Chemical Communications 57, nr 10 (1992): 2065–72. http://dx.doi.org/10.1135/cccc19922065.

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The adsorption of strontium on activated charcoal has been studied as a function of shaking time, pH, concentration of adsorbate and temperature. Wavelength dispersive X-ray fluorescence spectrometer was used for measuring strontium concentration. The adsorption of strontium obeys Freundlich and Langmuir isotherms. Quantities ∆H0 and ∆S0 were calculated from the slope and intercept of plot ln KD vs 1/T. The influence of different cations and anions on strontium adsorption has been examined. The adsorption of other metal ions on activated charcoal has been studied under specific conditions to check its selectivity. Consequently, strontium was removed from Rh, Pr, Rb and Cs. More than 95% adsorbed strontium on activated charcoal can be recovered with 65 ml 3M HNO3 solution.

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Kylivnik, Yu M., V. V. Tryshyn, M. V. Strilchuk, O. V. Gaidar, H. V. Vasylyeva, S. I. Vuchkan, O. Ya Sych i I. Yu Syika. "The titanium silicate influence on the Zn(II) and Sr(II) migration in the aquatic environment". Nuclear Physics and Atomic Energy 21, nr 3 (25.09.2020): 249–55. http://dx.doi.org/10.15407/jnpae2020.03.249.

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The aim of the present work is titanium silicate influence on the zinc and strontium migration in the aquatic environment. The adsorption capacity of titanium silicate toward zinc and strontium ions was investigated. With the aid of a fluorescent X-ray analyzer and energy dispersive spectroscopy the composition of the sorbent formed was determined as well as zinc and strontium presence on the surface of the sorbent after the sorption process. It was shown, that adsorption of zinc and strontium by titanium silicate strongly depends on time of interaction and solution acidity and increases with increasing of both parameters. It was established, that for the initial concentration of zinc and strontium at the level of 0.005M the presence of ions that cause the natural mineralization of water does not affect their adsorption extraction.

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Zhou, Han, Xue Gang Luo i Xiao Yan Lin. "Adsorption of Strontium from Aqueous Solution Using Collagen Fiber Immobilized Tannins". Advanced Materials Research 726-731 (sierpień 2013): 2107–10. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.2107.

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The removal of strontium from aqueous solution with collagen fiber immobilized tannins was studied. The effects of several experimental parameters such as pH, dosage, temperature, contact time and initial concentration of strontium on removal efficiency of strontium were investigated to determine the optimum conditions of strontium sorption process. The adsorbent was characterized by SEM and FTIR analysis. The results of regression analysis indicated that temperature parameters were not individually statistically significant for Sr2+ adsorption. However, the efficiency of strontium adsorption increased with the increase in pH and dosage. The adsorption capacity was increased with increasing initial concentration of Sr2+. The removal efficiency of Sr2+ was 49% at optimum pH of 6 and initial concentration of 20mg/L. Moreover, the absorption data were fitted well to the Langmuir sorption isotherm model.

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Chen, Yuliang, Xiangbiao Yin, Hao Fu, Zheyang Lin, Guangcan Ma, Xinpeng Wang, Qingsong Wang i Fangqiang Chen. "Preparation of Porous Composite Phase Na Super Ionic Conductor Adsorbent by In Situ Process for Ultrafast and Efficient Strontium Adsorption from Wastewater". Metals 13, nr 4 (29.03.2023): 677. http://dx.doi.org/10.3390/met13040677.

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Strontium, the main component of radioactive nuclear wastewater, is characterized by a high fission yield and an extended half-life. It is easily absorbed by the human body, thus greatly threatening the environment and the human body. In this study, a mesoporous composite phase sodium superionic conductor (NVP@NMP) was synthesized by the droplet template method, and the rapid capture of Sr2+ from wastewater was achieved by constructing a nano-heterogeneous interface to increase the ion diffusion rate. NVP@NMP showed efficient and rapid removal of strontium ions in adsorption kinetics, isothermal adsorption, solution pH, and interfering ions concentration tests. Especially the equilibrium time of 2 min for strontium absorption by NVP@NMP and a maximum theoretical adsorption capacity of 361.36 mg/g. The adsorption process was spontaneous, endothermic, and feasible. At higher concentrations of other competing ions (Na, K, Ca, Mg, and Cs), the adsorbent exhibited higher selectivity towards Sr2+.TEM, XPS, and XRD analyses revealed that ion exchange was the main mechanism for the NVP@NMP ultrafast adsorption of Sr2+. In this research, we investigated the feasibility of ultrafast strontium capture by sodium superionic conductor structured phosphates and explained the ultrafast strontium adsorption mechanism of NASICON materials through XPS.

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Fan, Shengnan, Lu Jiang, Zhiqian Jia, Yu Yang i Li’an Hou. "Comparison of Adsorbents for Cesium and Strontium in Different Solutions". Separations 10, nr 4 (19.04.2023): 266. http://dx.doi.org/10.3390/separations10040266.

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Adsorption is an effective method to remove cesium and strontium from a solution. Although a variety of adsorbents has been reported, it is difficult to compare their adsorption properties due to different experimental conditions (such as solution concentration, volume, composition, temperature, etc.). In this paper, a series of adsorbents for the adsorption of cesium and strontium (ammonium phosphomolybdate, Prussian blue, sabite, clinoptilolite, titanium silicate) were synthesized and characterized using XRD, IR and SEM, and their adsorption performance in mixed solution (containing Li, Na, K, Cs, Ca, Sr and Mg ions, 1 mmol L−1), artificial seawater and salt lake brine were studied under the same conditions; in addition, the adsorption mechanism was elucidated. The results showed that ammonium phosphomolybdate has the largest adsorption capacity for cesium in the mixed solution. In artificial seawater and salt lake brine, Prussian blue displays the highest cesium adsorption capacity and the best selectivity. The multi-adsorption mechanisms are beneficial to the selective adsorption of Prussian blue in complex solutions. These results are useful for choosing adsorbents for cesium and strontium in applications.

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KUMAR, RAJESH, i S. K. JAIN. "REMOVAL OF STRONTIUM (II) FROM AQUEOUS SOLUTION USING FUNCTIONALIZED CARBON NANOTUBES". International Journal of Nanoscience 11, nr 02 (kwiecień 2012): 1250019. http://dx.doi.org/10.1142/s0219581x12500196.

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This study was carried out to evaluate the environmental application of functionalized carbon nanotubes through the experimental removal of strontium (II) from water. The aim was to find the optimal condition for the removal of strontium from water under different conditions such as initial concentration of strontium, contact time and neutral pH. The functionalized multi wall carbon nanotubes (f-MWCNT) were characterized by FT-IR and scanning electron microscopy (SEM). The adsorption isotherms were correlated to Freundlich and Langmuir models and it was found that the adsorption data could be fitted better by Langmuir model than Freundlich one. The kinetic data shows that the adsorption describes well with the pseudo-second order kinetic model. Functionalized MWCNT can be used as good adsorbent for the removal of the strontium ions from polluted water according to results.

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Prajitno, Muhammad Yusuf, Mohamad Taufiqurrakhman, David Harbottle i Timothy N. Hunter. "Kinetic Studies of Cs+ and Sr2+ Ion Exchange Using Clinoptilolite in Static Columns and an Agitated Tubular Reactor (ATR)". ChemEngineering 5, nr 1 (11.02.2021): 9. http://dx.doi.org/10.3390/chemengineering5010009.

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Natural clinoptilolite was studied to assess its performance in removing caesium and strontium ions, using both static columns and an agitated tube reactor (ATR) for process intensification. Kinetic breakthrough curves were fitted using the Thomas and Modified Dose Response (MDR) models. In the static columns, the clinoptilolite adsorption capacity (qe) for 200 ppm ion concentrations was found to be ~171 and 16 mg/g for caesium and strontium, respectively, highlighting the poor material ability to exchange strontium. Reducing the concentration of strontium to 100 ppm, however, led to a higher strontium qe of ~48 mg/g (close to the maximum adsorption capacity). Conversely, halving the column residence time to 15 min decreased the qe for 100 ppm strontium solutions to 13–14 mg/g. All the kinetic breakthrough data correlated well with the maximum adsorption capacities found in previous batch studies, where, in particular, the influence of concentration on the slow uptake kinetics of strontium was evidenced. For the ATR studies, two column lengths were investigated (of 25 and 34 cm) with the clinoptilolite embedded directly into the agitator bar. The 34 cm-length system significantly outperformed the static vertical columns, where the adsorption capacity and breakthrough time were enhanced by ~30%, which was assumed to be due to the heightened kinetics from shear mixing. Critically, the increase in performance was achieved with a relative process flow rate over twice that of the static columns.

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Ren, Lin, Xudong Zhao, Baosheng Liu i Hongliang Huang. "Synergistic effect of carboxyl and sulfate groups for effective removal of radioactive strontium ion in a Zr-metal-organic framework". Water Science and Technology 83, nr 8 (19.03.2021): 2001–11. http://dx.doi.org/10.2166/wst.2021.103.

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Abstract Rapid removal of radioactive strontium from nuclear wastewater is of great significance for environmental safety and human health. This work reports the effective adsorption of strontium ion in a stable dual-group metal-organic framework, Zr6(OH)14(BDC-(COOH)2)4(SO4)0.75 (Zr-BDC-COOH-SO4), which contains strontium-chelating groups (-COOH and SO4) and a strongly ionizable group (-COOH). Zr-BDC-COOH-SO4 exhibits very rapid adsorption kinetics (<5 min) and a maximum adsorption capacity of 67.5 mg g−1. The adsorption behaviors can be well fitted to the pseudo-second-order model and the Langmuir isotherm model. Further investigations indicate that the adsorption of Sr2+ onto Zr-BDC-COOH-SO4 would not be obviously affected by solution pH and adsorption temperature. The feasible regeneration of the adsorbent was also demonstrated using a simple elution method. Mechanism investigation suggests that free -COOH contributes to the rapid adsorption based on electrostatic interaction, while the introduction of -SO4 significantly enhanced the adsorption capacity. Thus, these results suggest that Zr-BDC-COOH-SO4 is a potential candidate for Sr2+ removal. They also introduce dual groups as an effective strategy for designing high-efficiency adsorbents.

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Li, Yungui, Xiang Luo, Xueying Bai, Wenxuan Lv i Yang Liao. "Adsorption of Strontium onto Adaxial and Abaxial Cuticle of Photinia serrulata Leaf". International Journal of Environmental Research and Public Health 17, nr 3 (7.02.2020): 1061. http://dx.doi.org/10.3390/ijerph17031061.

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Leaf cuticle sorption is one important process for the uptake of environment pollutants in plants, and mixed powder including adaxial and abaxial cuticle is generally used to demonstrate the sorption behavior. However, the difference of adaxial and abaxial cuticle on plant cuticle sorption is not well understood. Abaxial cuticle (PAC) and adaxial cuticle (PBC) were isolated from hypostomatic Photinia serrulata to investigate their adsorption of a model radionuclide (strontium). The elemental composition and FTIR spectra for two cuticles were quite similar and both show high affinity (H/C, 1.59 and 1.65) and polarity ((O + N)/C, 0.470 and 0.499). Both adsorption isotherms fit well with Langmuir model (R2, 0.97 and 0.97), and the maximum adsorption capacity of PAC was 12.1 mg/g, little higher than that of PBC (10.3 mg/g). Adsorption of strontium increased with the increase of pH, and the maximum was attained when pH ≥4. Electrostatic attraction was demonstrated to be the main mechanism of -strontium adsorption onto PAC and PBC, and the similar adsorption of adaxial and abaxial cuticle was consistent with their similar isoelectric point.

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van Hensbergen, S. Y., B. Wierczinski i J. J. M. de Goeij. "Adsorption of strontium and strontium-HEDP complexes onto synthetic hydroxyapatite". Journal of Labelled Compounds and Radiopharmaceuticals 44, S1 (maj 2001): S790—S792. http://dx.doi.org/10.1002/jlcr.25804401278.

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Cao, Wei Ye, i Jun Fen Sun. "Strontium-Substituted Hydroxyapatite Nanocrystals Synthesized in Ultrasonic Field: Use for Protein Adsorption". Materials Science Forum 789 (kwiecień 2014): 224–29. http://dx.doi.org/10.4028/www.scientific.net/msf.789.224.

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Hydroxyapatite Ca10(PO4)6(OH)2 (HAP) is widely applied in a biomaterial because of its excellent biocompatibility and bioactivity. However, all properties of HAP, especially the adsorption properties can be tailored by modifying the composition with ionic substitutions. Among many cations that can substitute for calcium in the structure of HAP, strontium is a kind of essential trace elements in human body. It has been known as one of the cationic substitute for calcium in the HAP lattice. The strontium-substituted hydroxyapatite (Sr-HAP) is formed when strontium is doped in HAP structure. The bioactivity, biocompatibility, and adsorption properties are improved when the original lattice of HAP is destroyed. In this study, we focus on synthesis of strontium-substituted HAP nanocrystals in ultrasonic field which is a mild and simple synthesis method. The Sr-HAP with different Sr contents was synthesized. The effects of reaction temperature, sintering temperature and reaction time on protein adsorption of Sr-HAP were studied. In addition, the crystalline phase, chemical compound, surface area and morphology were characterized by XRD, FTIR, TEM and BET. The results indicate that the original lattice of HAP was destroyed and the structure of HAP doped with strontium formed. Sr-HAP with smaller crystal size, larger specific surface area and homogeneous distribution was prepared. Especially, it has great adsorption to target protein, bovine serum albumin (BSA).

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Popa, Adriana, Mihaela Ciopec, Adina Negrea, Lavinia Lupa, Petru Negrea, Corneliu M. Davidescu, Gheorghe Ilia i Narcis Duteanu. "Use of styrene–divinylbenzene grafted with aminoethylaminomethyl groups and various ionic liquids in the removal process of thallium and strontium". Pure and Applied Chemistry 86, nr 11 (1.11.2014): 1741–53. http://dx.doi.org/10.1515/pac-2014-0702.

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Abstract This work reports the adsorption of thallium and strontium from aqueous solutions onto styrene-divinylbenzene grafted with aminoethylaminomethyl groups which was impregnated with various ionic liquids [trihexyltetradecylphosphonium chloride ionic liquid – (Cyphos IL-101); 1-octyl-3-methylimidazolium tetrafluoroborate – (OmimBF4) and 1-butyl-3-methylimidazolium hexafluorophosphate – (BmimPF6)]. The impregnation of the solid support with the studied ionic liquids was realized through ultrasonication method. The obtained impregnated materials have been subjected to Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy dispersive X-ray analysis (EDX). Their adsorption performance in the removal process of thallium and strontium from aqueous solutions was studied as a function of the initial concentration of metal ions. Adsorption isotherms like Langmuir, Freundlich, Dubinin–Radushkevich (D–R) and Temkin were used to analyze the equilibrium data at different concentrations. The studied materials showed a better adsorption performance in the removal process of strontium ions compared to the adsorption performance obtained in case of thallium ions removal process. From the studied ionic liquids, (OmimBF4) presented the most efficient performance for the removal of the studied metal ions.

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Zhu, Wen, Junsheng Liu i Meng Li. "Fundamental Studies of Novel Zwitterionic Hybrid Membranes: Kinetic Model and Mechanism Insights into Strontium Removal". Scientific World Journal 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/485820.

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A series of zwitterionic hybrid membranes were prepared via the ring opening of 1,3-propanesultone with the amine groups in the chains of TMSPEDA and a subsequent sol-gel process. Their kinetic models for strontium removal were investigated using three two-parameter kinetic equations (i.e., Lagergren pseudo-first order, pseudo-second order, and Elovich models). Adsorption mechanism was evaluated using intraparticle diffusion model, diffusion-chemisorption model, and Boyd equation. It was found that the adsorption of strontium ions on these zwitterionic hybrid membranes fitted well with the Lagergren pseudo-second order model. Mechanism insights suggested that diffusion-chemisorption was one of the main adsorption mechanisms. Boyd equation exhibited that film-diffusion mechanism might be the control process during the starting period. These findings are very useful in strontium removal from the stimulated radioactive wastewater.

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Brady, P. V. "Adsorption/Desorption of Strontium on Calcite*". Mineralogical Magazine 62A, nr 1 (1998): 225–26. http://dx.doi.org/10.1180/minmag.1998.62a.1.119.

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Ammitzbøll, Andreas L., Steen Lysgaard, Agata Klukowska, Tejs Vegge i Ulrich J. Quaade. "Surface adsorption in strontium chloride ammines". Journal of Chemical Physics 138, nr 16 (28.04.2013): 164701. http://dx.doi.org/10.1063/1.4800754.

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Vasylyeva, Hanna, Ivan Mironyuk, Mykola Strilchuk, Igor Maliuk, Igor Mykytyn i Volodymyr Tryshyn. "A new way to ensure selective zirconium ion adsorption". Radiochimica Acta 109, nr 12 (27.10.2021): 877–90. http://dx.doi.org/10.1515/ract-2021-1083.

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Abstract This work studies the adsorption of zirconium ions by mesoporous titanium dioxide with surface arsenate groups. Experimental maximal adsorption values of zirconium ions were found to be 109.6 mg/g in neutral medium. This process depends on the interaction time, the equilibrium concentration of zirconium ions, and the acidity of the solution. Adsorption kinetics fit well into the kinetic model based on the pseudo-second-order equation (R 2 = 0.9984). Equilibrium adsorption of zirconium ions is well described by Langmuir’s adsorption theory (R 2 = 0.9856 and χ 2 = 1.307). Although zirconium ions are less actively adsorbed from a neutral medium than strontium or yttrium ions, in the 2% nitric acid only zirconium is adsorbed out of the mixture of zirconium, strontium, and yttrium. The results obtained by inductively coupled plasma mass spectrometry have shown that the investigated adsorbent selectively adsorbs zirconium ions from their mixture with strontium and yttrium in the range of solution acidity pH = 0–1. The average percentage of maximum extraction of zirconium ions is 94.3 ± 2.4%, and the highest percent of zirconium ions taken up from the mixture with strontium and yttrium is ∼98.4%. Investigated titanium dioxide selectively separate 90Zr from 90Sr with the presence of 1000-fold excess of stable 88Sr in radioactive liquid β − source. This fact is extremely valuable for the age dating of 90Sr-containing device in nuclear forensics or the determination of 90Sr in low activity background samples.

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Hasan, Shameem, A. Iasir, Tushar Ghosh, Bhaskar Sen Gupta i Mark Prelas. "Characterization and Adsorption Behavior of Strontium from Aqueous Solutions onto Chitosan-Fuller’s Earth Beads". Healthcare 7, nr 1 (26.03.2019): 52. http://dx.doi.org/10.3390/healthcare7010052.

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Fuller’s earth spherical beads using chitosan as a binder were prepared for the removal of strontium ions from aqueous solution. The adsorbents were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), which revealed the porous nature of the beads. The Brunauer–Emmett–Teller (BET) surface area of the beads was found to be 48.5 m2/g. The adsorption capacities of the beads were evaluated under both batch and dynamic conditions. The adsorption capacity was found to be ~29 mg/g of adsorbent at 298 K when the equilibrium concentration of strontium in the solution was 925 mg/L at pH 6.5. The X-ray photoelectron spectroscopy (XPS) data suggest that strontium uptake by the beads occurs mainly through an ion-exchange process. Kinetic data indicate that the sorption of strontium onto the beads follows anomalous diffusion. Thermodynamic data suggest that the ion-exchange of Sr2+ on the bead surface was feasible, spontaneous and endothermic in nature.

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Marinovic, Sanja, Marija Ajdukovic, Natasa Jovic-Jovicic, Tihana Mudrinic, Bojana Nedic-Vasiljevic, Predrag Bankovic i Aleksandra Milutinovic-Nikolic. "Adsorption of strontium on different sodium-enriched bentonites". Journal of the Serbian Chemical Society 82, nr 4 (2017): 449–63. http://dx.doi.org/10.2298/jsc161010008m.

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Bentonites from three different deposits (Wyoming, TX, USA and Bogovina, Serbia) with similar cation exchange capacities were sodium enriched and tested as adsorbents for Sr2+ in aqueous solutions. X-Ray diffraction analysis confirmed successful Na-exchange. The textural properties of the bentonite samples were determined using low-temperature the nitrogen physisorption method. Significant differences in the textural properties between the different sodium enriched bentonites were found. Adsorption was investigated with respect to adsorbent dosage, pH, contact time and the initial concentration of Sr2+. The adsorption capacity increased with pH. In the pH range from 4.0?8.5, the amount of adsorbed Sr2+ was almost constant but 2?3 times smaller than at pH ?11. Further experiments were performed at the unadjusted pH since extreme alkaline conditions are environmentally hostile and inapplicable in real systems. The adsorption capacity of all the investigated adsorbents toward Sr2+ was similar under the investigated conditions, regardless of significant differences in the specific surface areas. It was shown and confirmed by the Dubinin?Radushkevich model that the cation exchange mechanism was the dominant mechanism of Sr2+ adsorption. Their developed microporous structures contributed to the Sr2+ adsorption process. The adsorption kinetics obeyed the pseudo-second-order model. The isotherm data were best fitted with the Langmuir isotherm model.

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Karaseva, O. N., L. I. Ivanova i L. Z. Lakshtanov. "Adsorption of strontium on manganese oxide (δ-MnO2) at elevated temperatures: experiment and modeling". Геохимия 64, nr 10 (19.11.2019): 1091–104. http://dx.doi.org/10.31857/s0016-752564101091-1104.

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Strontium adsorption has been studied by the method of acid-base potentiometric titrations at three different temperatures: 25, 50, 75C. The effect of pH, ionic strength, sorbate/sorbent ratio, and temperature on adsorption was investigated. Experimental data were simulated using two various surface complexation models, with two different electrostatic descriptions of the interface: the constant capacitance model (CCM) and the triple-layer model (TLM). Although the both models used are able to account for the acid-base reactions and surface complexation of strontium on birnessite, we consider that the TLM is more applicable for a description of heterophaseous system H+ MnOH Sr2+. Under conditions of low ionic strength and negatively charged surface, Sr2+ ions compete with the electrolyte ions and form outer-sphere complexes along with inner-sphere complexes. Consequently, using the CCM for description of strontium adsorption data could be mathematically satisfactory, but physically senseless. The equilibrium model proposed here consists of the complexes of inner (MnOHSr2+, MnOSr+, MnOSrOH0) and outer types ([MnO Sr2+]+). The corresponding intrinsic equilibrium constants of the formation of these surface complexes were calculated for 25,50, and 75C.

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Zhang, Dong, i Yan Cheng. "Synthesis of Nano-Strontium Titanate Immobilised on the Silica Gel G and its Application in Removal of Heavy Metal Ions from Water". Advanced Materials Research 194-196 (luty 2011): 751–54. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.751.

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A new adsorption agent, nanosized strontium titanate immobilized on the silica gel G (GSTO) was prepared, and it was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The ability of the new adsorption to remove heavy metal Pb, Cd, Zn, Cu, Ni and Mn from water samples was assessed. The research results displayed that adsorbent has the highest adsorption capacity for Pb, Cd, Zn, Cu, Ni and Mn in ions mixture system. Optimal experimental conditions including pH and contact time have been established. Desorption studies were carried out successfully with diluted HNO3 solutions. Thus, nano-strontium titanate immobilized on the silica gel G is favorable and useful for the removal of these heavy metal ions, and the high adsorption capacity makes it a good promising candidate material for Pb, Cd, Zn, Cu, Ni and Mn removal.

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Zhang, Lan, Jiying Wei, Xuan Zhao, Fuzhi Li, Feng Jiang i Meng Zhang. "Strontium(II) adsorption on Sb(III)/Sb2O5". Chemical Engineering Journal 267 (maj 2015): 245–52. http://dx.doi.org/10.1016/j.cej.2014.11.124.

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Liu, Ming Xue, Fa Qin Dong, Dong Zhang, Wu Kang, Hong Fu Wei, Qing Bi Gou, Yu Sun i Xu Guang Du. "The Effect of Glucose on Saccharomyces cerevisiae Cell Biosorption of Strontium under Simulation Culture Conditions". Advanced Materials Research 610-613 (grudzień 2012): 173–76. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.173.

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The effect of glucose on Saccharomyces cerevisiae cell biosorption of strontium under simulation culture conditions was studied in this research. The results showed that the glucose adding did not abviously increase the biosorption efficiency in 30-150 min and after 8 h. The glucose adding might stimulate the S.cerevisiae cell biosorption of strontium ions in 4-8 h for high initial strontium concentration. The results indicated that the glucose adding only stimulated S.cerevisiae cell biosorption of strontium at certain biosorption time and the biosorption process first was a physical adsorption followed bioaccumulation according to interface process and cell growth cycle under simulation culture conditions.

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Zhang, Dong. "Preparation and Characterization of Nano-Strontium Titanate Based on Glass Fiber Filter and its Application in Adsorption of Heavy Metals". Applied Mechanics and Materials 44-47 (grudzień 2010): 2140–43. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.2140.

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Nano-strontium titanate based on glass fiber filter (GFST) was successfully prepared by sol-gel method and characterized using XRD and SEM. The adsorptive potential of GFST for heavy metal ions, such as lead, cadmium, zinc and nickel, was investigated. The results showed that the nano-strontium titanate could crystal based on glass fiber, gaining a new block adsorbent like a leaf. The lead, cadmium, zinc and nickel ions were quantitatively retained at pH 6-9; their adsorption capacities of GFST for lead, cadmium, zinc and nickel ions were 153.21 mg•g-1, 8.32 mg•g-1, 21.36 mg•g-1 and 4.80 mg•g-1, respectively. The adsorbent can be regenerated completely by elution with 0.5 mol•L-1 HNO3. The adsorbent has a promising prospect in removal or enriching of lead, cadmium, zinc and nickel ions in water.

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Kunishi, Hiroto, Takeshi Hagio, Yuki Kamimoto i Ryoichi Ichino. "Investigation on Strontium Adsorption Selectivity of Hydrothermally Synthesized Layered Sodium Titanates". Science of Advanced Materials 12, nr 2 (1.02.2020): 186–90. http://dx.doi.org/10.1166/sam.2020.3624.

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Two layered sodium titanate phases, sodium nonatitanate (Na4Ti9O20) and sodium trititanate (Na2Ti3O7), have been hydrothermally synthesized and their Sr2+ adsorption selectivity was investigated in the coexistence of Cs+ with ionic equivalent concentration. Although both phases exhibit Sr2+ selective adsorption, Na4Ti9O20 adsorbed both Sr2+ and Cs+, while the adsorption of Cs+ was not detected on Na2Ti3O7, despite its higher adsorption capacity. To investigate the causes for the high Sr2+ selectivity of Na2Ti3O7, additional adsorption tests were carried out in different pH, which can be interpreted as the Sr2+ –H+ binary system, and in single and ternary systems of Al3+, Sr2+ and K+ with ionic equivalent concentrations. When changing the pH, the adsorption amount of Sr2+ showed a high and nearly constant value at pH above 4 and drastically decreased at pH below 3, reaching nearly zero at pH 2. In the Al3+–Sr2+ –K+ ternary system, the adsorption amount decreased in the order of Sr2+, Al3+ and K+. The adsorption amount of K+ was low compared to that of Sr2+ and Al3+ in both the single and ternary systems. Meanwhile, the adsorption amount of Sr2+ significantly decreased compared to that in the single system, unlike in the Sr2+–Cs+ binary system where the adsorption of Sr2+ was almost the same. From these results, the high Sr2+ selectivity of Na2Ti3O7 in the Sr2+–Cs+ binary system was anticipated to be due to the size effect. The smaller interlayer spacing of Na2Ti3O7 compared to that of Na4Ti9O20 appears to inhibit the intercalation of Cs+ due to its large ionic radius.

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Antonov, Dimitar. "Assessment of strontium transport in clay medium by using a reactive transport modelling approach – an HP1 case study model". Geologica Balcanica 46, nr 2 (listopad 2017): 23–26. http://dx.doi.org/10.52321/geolbalc.46.2.23.

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Modelling of radionuclide transport in the geosphere is a key issue of the evaluation of safety of low- and intermediate-level radioactive waste (LILW) repositories. In Bulgaria, due to the operation of Kozloduy Nuclear Power Plant (NPP), a building of such facility is ongoing. The migration of 90Sr was evaluated by simulation of flow and chemical modelling, performed with coupled numerical code HP1. The adsorption properties of the clays were implemented in the code by surface complexation reactions between strontium and iron oxides. The results were compared with another model performed with computer code HYDRUS 1-D, in which the adsorption properties of the medium were evaluated with the relevant for strontium distribution coefficient, Kd.

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27

Abu-Nada, Abdulrahman, Ahmed Abdala i Gordon McKay. "Isotherm and Kinetic Modeling of Strontium Adsorption on Graphene Oxide". Nanomaterials 11, nr 11 (20.10.2021): 2780. http://dx.doi.org/10.3390/nano11112780.

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In this study, graphene oxide (GO) was synthesized using Hummers method. The synthesized GO was characterized using field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Fourier transformed infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and Brunauer–Emmett–Teller (BET) nitrogen adsorption. The analyses confirmed the presence of oxygen functional groups (C=O and C-O-C) on the GO surface. These oxygen functional groups act as active sites in the adsorption Sr (II). The BET analysis revealed the surface area of GO of 232 m2/g with a pore volume of 0.40 cm3/g. The synthesized GO was used as an adsorbent for removing Sr (II) from aqueous solutions. The adsorption equilibrium and kinetic results were consistent with the Langmuir isotherm model and the pseudo-second-order kinetic model. A maximum strontium adsorption capacity of 131.4 mg/g was achieved. The results show that the GO has an excellent adsorption capability for removing Sr (II) from aqueous solutions and potential use in wastewater treatment applications.

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Bors, J., A. Gorny i S. Dultz. "Iodide, caesium and strontium adsorption by organophilic vermiculite". Clay Minerals 32, nr 1 (marzec 1997): 21–28. http://dx.doi.org/10.1180/claymin.1997.032.1.04.

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AbstractDistribution coefficients and isotherms for the adsorption of radioiodide, caesium and strontium ions (125I−, 134Cs+ and 85Sr2+) were determined in untreated vermiculite and in vermiculite treated with the chloride salt of hexadecylpyridinium (HDPy+). Experimental data reveal that some of the alkylammonium ions were incorporated as HDPyCl ion pairs into the vermiculite. The fraction of ion pairs adsorbed is reflected by an increase in distribution coefficients with increasing saturation levels. Consequently, a considerable part of the iodide adsorption could be attributed to an anion exchange process. At smaller amounts of Cs+ and Sr2+ adsorbed, distribution coefficients of the modified clay mineral are significantly reduced in comparison with the original material. These differences are less pronounced when greater amounts of cations are adsorbed. Generally, larger distribution coefficients were found for the Cs+ compared with the Sr2+ ion in the untreated and modified samples.

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29

Wu, Hanyu, Zhen Xu, Lu Zhu, Xi Cheng i Mingliang Kang. "Adsorption of strontium at K-feldspar-water interface". Applied Radiation and Isotopes 181 (marzec 2022): 110111. http://dx.doi.org/10.1016/j.apradiso.2022.110111.

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Keçeli, Gönül. "Adsorption Kinetics and Equilibria of Strontium onto Kaolinite". Separation Science and Technology 50, nr 1 (31.12.2014): 72–80. http://dx.doi.org/10.1080/01496395.2014.955206.

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Ishikawa, Tatsuo, Hiroshi Saito, Akemi Yasukawa i Kazuhiko Kandori. "Adsorption of CO2on non-stoichiometric strontium–calcium hydroxyapatites". J. Chem. Soc., Faraday Trans. 89, nr 20 (1993): 3821–25. http://dx.doi.org/10.1039/ft9938903821.

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Zhang, Lan, Jiying Wei, Xuan Zhao, Fuzhi Li i Feng Jiang. "Adsorption characteristics of strontium on synthesized antimony silicate". Chemical Engineering Journal 277 (październik 2015): 378–87. http://dx.doi.org/10.1016/j.cej.2015.04.145.

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Galamboš, Michal, Jana Kufčáková, Ol’ga Rosskopfová i Pavol Rajec. "Adsorption of cesium and strontium on natrified bentonites". Journal of Radioanalytical and Nuclear Chemistry 283, nr 3 (30.12.2009): 803–13. http://dx.doi.org/10.1007/s10967-009-0424-9.

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Li, Xingliang, Wanjun Mu, Xiang Xie, Bijun Liu, Hui Tang, Guanhong Zhou, Hongyuan Wei, Yuan Jian i Shunzhong Luo. "Strontium adsorption on tantalum-doped hexagonal tungsten oxide". Journal of Hazardous Materials 264 (styczeń 2014): 386–94. http://dx.doi.org/10.1016/j.jhazmat.2013.11.032.

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35

Honda, Mitsunori, Yui Kaneta i Tsuyoshi Yaita. "EXAFS investigation of strontium adsorption onto weathered biotite". AIP Advances 13, nr 1 (1.01.2023): 015314. http://dx.doi.org/10.1063/5.0106879.

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The efficiency of the sorption of Sr2+ on weathered biotite (WB), a type of clay mineral, was investigated. Removal of Sr2+ and Cs+ is important in the treatment of contaminated water from the 1F accident, which is one of the radionuclide waste treatment problems. We focused on developing an adsorption method for Sr ions using WB, which is abundant in Fukushima. Applying a molten salt treatment, the amount of sorbed Sr2+ simply increased as the added mass ratio of strontium chloride (SrCl2) increased from 1:1, 1:5, and 1:10 for the onefold, fivefold, and tenfold additions of SrCl2, respectively. Then, the crystal structure of WB as an adsorbent was evaluated by x-ray diffraction (XRD) analysis. Thus, it was observed that the WB retained its original crystal structure even after the sorption of Sr2+. Extended x-ray absorption fine structure (EXAFS) analysis was performed to investigate the local sorption structure of Sr2+ in the WB. The results revealed that Sr2+ was preferentially sorbed into the SiO4 and Al2O3 layers when Sr2+ was in the low mass ratio, whereas it was mainly sorbed into the SiO4 layer when the ratio was high.

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Zhuravlev, Igor. "Titanium Silicates Precipitated on the Rice Husk Biochar as Adsorbents for the Extraction of Cesium and Strontium Radioisotope Ions". Colloids and Interfaces 3, nr 1 (12.03.2019): 36. http://dx.doi.org/10.3390/colloids3010036.

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The aim of the work was the development of cheap and effective adsorbents based on titanium silicates deposited on the products of thermochemical processing of rice husk to extract cesium and strontium radioisotopes from aqueous media. Synthesis of adsorbents was carried out using the cheapest and widely used titanium water-soluble reagent, titanium sulfate (an intermediate product of white rutile pigment production), as feedstock. After treatment with titanium sulfate and neutralization, hydrothermal treatment was carried out in various ways. The traditional method of processing in an autoclave was used, as well as the blowing at different temperatures by steam. The distribution coefficients and the adsorption capacity for cesium and strontium ions on these sorbents were studied. Along with the chemical composition of adsorbents obtained by those ways, the type and the temperature of hydrothermal treatment also affected the adsorption properties. It was found that the adsorbent obtained by hydrothermal treatment in an autoclave has the highest degree of cesium ions extraction (Kd = 27,500). The highest degree of strontium ions extraction (Kd = 2,095,000) has an adsorbent obtained by hydrothermal treatment with water vapor blowing.

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37

Li, Hu, Kexue Han, Jinhua Shang, Weihai Cai, Minghao Pan, Donghui Xu, Can Du i Rui Zuo. "Comparison of Adsorption Capacity and Removal Efficiency of Strontium by Six Typical Adsorption Materials". Sustainability 14, nr 13 (24.06.2022): 7723. http://dx.doi.org/10.3390/su14137723.

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The rapid development and application of nuclear technology have been accompanied by the production of large amounts of radioactive wastes, of which Sr is a typical nuclide. In this study, six typical materials with strong adsorption properties, namely activated carbon, kaolin, montmorillonite, bentonite, zeolite, and attapulgite, were selected. Their adsorption mechanisms were investigated by analyzing their adsorption isotherms, adsorption kinetics, micromorphologies, element contents, specific surface areas, crystal structures, and functional groups. The results showed that the adsorption efficiency of Sr by the six adsorbents can be ranked as zeolite, bentonite, attapulgite, montmorillonite, activated carbon, and kaolin, among which the maximum adsorption capacity of zeolite was 4.07 mg/g. Based on the adsorption kinetic and thermodynamic fitting results, the adsorption of Sr by zeolites, bentonite and attapulgite is consistent with Langmuir model, the pseudo-first-order and pseudo-second-order model, and the adsorption process of Sr (II) by montmorillonite, activated carbon and kaolinite is consistent with the Freundlich model and corresponds to non-uniform adsorption. The main mechanisms of the six materials are physical adsorption, ion exchange and complexation. In summary, zeolite, bentonite, and attapulgite, especially zeolite, are highly effective for the treatment of radioactive wastewater containing strontium and have great application value in the treatment of radioactive wastes.

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38

Araissi, Manel, Imen Ayed, Elimame Elaloui i Younes Moussaoui. "Removal of barium and strontium from aqueous solution using zeolite 4A". Water Science and Technology 73, nr 7 (23.12.2015): 1628–36. http://dx.doi.org/10.2166/wst.2015.640.

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The adsorption efficiency of Sr2+ and Ba2+ from aqueous solutions by zeolite 4A was investigated. Adsorption studies were carried out both in single and binary component systems. The single ion equilibrium adsorption data were fitted to three isotherm models: Langmuir, Freundlich and Dubinin–Radushkevich. The Langmuir model represents the equilibrium data better than the Freundlich model in the studied initial metal concentration (0.3–25 mmol L−1) in both the single and binary component systems. The obtained RL (separation factor or Langmuir parameter) values were in the range of 0–1 indicating that Sr2+ and Ba2+ sorption were favorable. The obtained mean free energy value for adsorption of Ba2+ and Sr2+ was 8.45 kJ mol−1 and 9.12 kJ mol−1, respectively, indicating that both ions were uptaken through an ion exchange process. The maximum adsorption capacities (Qmax) were 2.25 mmol g−1 and 2.34 mmol g−1 for Ba2+ and Sr2+ ions, respectively. Also, the study of the competitive sorption of ions in the binary system showed that zeolite 4A preferentially adsorbs cations in the following order: Ba2+ < Sr2+.

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39

Kim, Gyuhyeon, Dae Sung Lee, Harry Eccles, Su Min Kim, Hyun Uk Cho i Jong Moon Park. "Selective strontium adsorption using synthesized sodium titanate in aqueous solution". RSC Advances 12, nr 29 (2022): 18936–44. http://dx.doi.org/10.1039/d2ra02494b.

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Amorphous sodium titanates were synthesized using a mid-temperature sol–gel method for evaluation as selective adsorbents of strontium in the presence of cesium or metal cations (Al3+, Mg2+, Ca2+, and Mn2+) from aqueous solution.

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40

Ai, Lian, Xue Gang Luo i Xiao Yan Lin. "Biosorption of Strontium Ions by Low-Cost Sunflower Stem and Leaf". Materials Science Forum 804 (październik 2014): 59–62. http://dx.doi.org/10.4028/www.scientific.net/msf.804.59.

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Low cost agricultural by-products are potential materials for water pollution treatment such as removal of radionuclide. This paper deals with removal of strontium ions from aqueous solution using sunflower stem (SFS) and leaf (SFL). Batch sorption experiments were performed as a function of initial solution pH, adsorbent dosage and initial strontium (II) concentration. The removal efficiency of strontium (II) increased with initial pH and achieved maximum values at a pH range of 4.0-7.0 both for SFS and SFL. The isotherm adsorption data was modeled best by the nonlinear Langmuir-Freundlich equation. The maximum sorption capacity of SFS and SFL were observed to be 17.87 and 22.31 mg/g under optimal conditions, respectively.

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41

Oszczak, Agata, i Leon Fuks. "Sorption of Sr-85 and Am-241 from liquid radioactive wastes by alginate beads". Nukleonika 60, nr 4 (1.12.2015): 927–31. http://dx.doi.org/10.1515/nuka-2015-0155.

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Abstract The paper reports the adsorption of strontium(II) and americium(III) from aqueous solutions onto calcium alginate (CaA), barium alginate (BaA) and strontium alginate (SrA) beads. Adsorption process was studied in batch experiments as a function of the initial pH of the solution and the contact time. All sorbents were examined by the termogravimetric analysis (TG). Laboratory obtained spherical beads of CaA, BaA and SrA seem to be good metal sorbents from liquid radioactive wastes. A contact time of about 4 h and neutral pH of the initial aqueous solution have been proposed to be optimum conditions for Sr-85 and Am-241 removal from the contaminated solutions using alginate sorbents. Laboratory obtained beads of CaA, BaA and SrA are characterized by the decontamination factor (DF) equal to 85% for Sr(II) and 90% for Am(III).

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42

Xie, Taiping, Longjun Xu, Chenglun Liu, Shihuan Ding, Jun Yang i Wenli Wu. "Synthesis and adsorption properties of high specific surface area strontium ferrite from Industrial Strontium Residue". Vacuum 93 (lipiec 2013): 71–78. http://dx.doi.org/10.1016/j.vacuum.2013.01.005.

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43

Shao, Yang, Yuanyuan Zhao, Min Luo, Guifang Zhao, Diandou Xu, Zhiming Liu i Lingling Ma. "Effect of Environmental Conditions on Strontium Adsorption by Red Soil Colloids in Southern China". Processes 11, nr 2 (25.01.2023): 379. http://dx.doi.org/10.3390/pr11020379.

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The fate of radionuclides in the environment is attracting increased attention. The effect of various environmental effects on the adsorption behavior of the strontium ion (Sr2+) by red soil colloids in Southern China was studied by a series of batch experiments, and the adsorption mechanism was briefly investigated as well. With the increase in the solid–liquid ratio and the concentration of Sr2+, the adsorption efficiency increased gradually. The effect of pH and ionic strength on adsorption was strong, while temperature had little effect. The adsorption data fitted to the Langmuir model indicates that the process is monolayered and homogeneous. The thermodynamic parameters also show that the adsorption of Sr2+ on red soil colloids is a spontaneous and exothermic process. The aim of this work is to gain insight into the role of red soil colloids on the fate of radionuclides in the field.

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44

Gomonaj, V., P. Gomonaj, N. Golub, K. Szekeresh, B. Charmas i R. Leboda. "Compatible Adsorption of Strontium and Zinc Ions as Well as Vitamins on Zeolites". Adsorption Science & Technology 18, nr 4 (maj 2000): 295–306. http://dx.doi.org/10.1260/0263617001493440.

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Adsorbents based on natural Sokyrnytsky clinoptilolite have been prepared by treating the base sorbent with aqueous solutions of different salts or acids (HCl, NH4OH or NaCl). The separate adsorption of Zr2+ and Sr2+ ions and of vitamin B1 together with the joint adsorption of Sr2+ ions and vitamin B1 has been investigated on the prepared samples. The adsorption isotherms of the cations were studied both against concentration and time, when superposition of the adsorption and desorption curves was observed. This suggests the possibility of using such adsorbents for the isolation of heavy metal ions from human organisms without simultaneous loss of vitamin B1.

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45

Wu, Lina, Huiping Wang, Xiangqian Kong, Haibo Wei, Sheng Chen i Lisheng Chi. "High strontium adsorption performance of layered zirconium phosphate intercalated with a crown ether". RSC Advances 13, nr 10 (2023): 6346–55. http://dx.doi.org/10.1039/d2ra07757d.

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Yusan, Sabriye, i Sema Erenturk. "Adsorption Characterization of Strontium on PAN/Zeolite Composite Adsorbent". World Journal of Nuclear Science and Technology 01, nr 01 (2011): 6–12. http://dx.doi.org/10.4236/wjnst.2011.11002.

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Sahoo, Jitendra Kumar, Monidipa Konar, Juhi Rath, Devendra Kumar i Harekrushna Sahoo. "Hexagonal strontium ferrite: cationic dye adsorption and antibacterial activity". Separation Science and Technology 55, nr 3 (26.02.2019): 415–30. http://dx.doi.org/10.1080/01496395.2019.1577267.

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Hayakawa, Shingo, Soichiro Matsubara, Yusuke Sumi, Syo Yamamoto, Norihisa Kawamura i Toru Nonami. "Caesium and strontium adsorption ability of activated bamboo charcoal". International Journal of Nanotechnology 15, nr 8/9/10 (2018): 683. http://dx.doi.org/10.1504/ijnt.2018.098434.

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Wang, Li, Chunli Wan, Duu-Jong Lee, Joo-Hwa Tay, X. F. Chen, Xiang Liu i Yi Zhang. "Adsorption–desorption of strontium from waters using aerobic granules". Journal of the Taiwan Institute of Chemical Engineers 44, nr 3 (maj 2013): 454–57. http://dx.doi.org/10.1016/j.jtice.2012.12.005.

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Zhang, Lan, Jiying Wei, Xuan Zhao, Fuzhi Li, Feng Jiang, Meng Zhang i Xuzhou Cheng. "Competitive adsorption of strontium and cobalt onto tin antimonate". Chemical Engineering Journal 285 (luty 2016): 679–89. http://dx.doi.org/10.1016/j.cej.2015.10.013.

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