Enhanced adsorption and separation of Re(VII) using organic-inorganic hybrid silica adsorbent

Shan, Wei; Zhang, Yingying; Shu, Yanning; Zhang, Danyang; Xing, Changyu; Xiong, Ying

doi:10.1016/j.micromeso.2021.110996

Cited by 23 publications

(4 citation statements)

References 37 publications

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“…However, the adsorption quantity of Re(VII) decreased from 226.23 to 81.64 mg/g as the dosage raised from 0.05 to 0.25 g/L, where the increase in the dosage caused excessive, resulting in insufficient Re(VII) ions reacting with TNTs‐FeS, accompanied by a significant decrease in adsorption capacity. The TNTs‐FeS composite possessed a better adsorption capacity on Re(VII) than some published literature results, such as g‐C 3 N 4 nanosheets, [39] silica‐chitosan, [40] and organic‐inorganic hybrid silica [9d] . This may be due to the special structure of TNTs with hollow spiral cross‐section, open ends, small tube diameters, large specific surface areas and numerous hydroxyl groups [25b] .…”

Section: Resultsmentioning

confidence: 87%

Adsorption Behavior of U(VI) and Re(VII) on Iron Sulfide Nanoparticles Modified with Titanate Nanotubes: Mechanism and Performance Insights

et al. 2023

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A novel nanocomposite (TNTs-FeS) was developed by anchoring ferrous sulfide (FeS) nanoparticles immobilized on titanate nanotubes (TNTs) by hydrothermal method to remove U(VI) and Re(VII) from aqueous solution, and the removal mechanism and efficiency were examined. The experimental results showed that the TNTs can effectively improve the dispersibility and stability of FeS. The environmental conditions, including initial solution pH, initial concentration, equilibrium time, and dosage, played an important role in the remediation process, which can affect the immobilization efficiency significantly. The maximum quantity removal of U(VI) and Re(VII) was 291.67 and 226.23 mg/g at pH of 6.0 and 12.0. The adsorption kinetics and the equilibrium isotherms of U(VI) and Re(VII) all fitted well with the pseudo-second-order model (R 2 > 0.99) and the Freundlich model (R 2 > 0.99). The main mechanism of removal by TNTs-FeS was electrostatic attraction, chemical reduction, and surface complexation. Thus, TNTs-FeS composites exhibited a high potential to remove U(VI) and Re(VII) heavy metal ions from the surface and groundwater.

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Section: Resultsmentioning

confidence: 87%

Adsorption Behavior of U(VI) and Re(VII) on Iron Sulfide Nanoparticles Modified with Titanate Nanotubes: Mechanism and Performance Insights

et al. 2023

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“…They are minerals composed mainly of silica (silicon dioxide, SiO 2 ) and can have different forms, such as colloidal silica, activated silica, or functionalized silica [ 25 ]. Silica can effectively absorb a variety of contaminants, including heavy metals [ 26 , 27 , 28 ], organic compounds [ 29 ], dyes [ 30 , 31 ], and other harmful substances [ 32 ]. The silica used in this study has been further functionalized to improve its properties.…”

Section: Introductionmentioning

confidence: 99%

Application of Mesoporous Silicas for Adsorption of Organic and Inorganic Pollutants from Rainwater

Marszałek,

Puszczało,

Szymańska

et al. 2024

Materials

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Precipitation is an important factor that influences the quality of surface water in many regions of the world. The pollution of stormwater runoff from roads and parking lots is an understudied area in water quality research. Therefore, a comprehensive analysis of the physicochemical properties of rainwater flowing from parking lots was carried out, considering heavy metals and organic micropollutants. High concentrations of zinc were observed in rainwater, in addition to alkanes, e.g., tetradecane, hexadecane, octadecane, 2,6,10-trimethyldodecane, 2-methyldodecane; phenolic derivatives, such as 2,6-dimethoxyphenol and 2,4-di-tertbutylphenol; and compounds such as benzothiazole. To remove the contaminants present in rainwater, adsorption using silica carriers of the MCF (Mesostructured Cellular Foams) type was performed. Three groups of modified carriers were prepared, i.e., (1) SH (thiol), (2) NH2 (amino), and (3) NH2/SH (amine and thiol functional groups). The research problem, which is addressed in the presented article, is concerned with the silica carrier influence of the functional group on the adsorption efficiency of micropollutants. The study included an evaluation of the effects of adsorption dose and time on the efficiency of the contaminant removal process, as well as an analysis of adsorption isotherms and reaction kinetics. The colour adsorption from rainwater was 94–95% for MCF-NH2 and MCF-NH2/SH. Zinc adsorbance was at a level of 90% for MCF-NH2, and for MCF-NH2/SH, 52%. Studies have shown the high efficacy (100%) of MCF-NH2 in removing organic micropollutants, especially phenolic compounds and benzothiazole. On the other hand, octadecane was the least susceptible to adsorption in each case. It was found that the highest efficiency of removal of organic micropollutants and zinc ions was obtained through the use of functionalized silica NH2.

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“…This approach offers easy operation and high efficiency. Commonly used ion exchange materials include resins, , molecular compounds, silica, − metal borates, , layered double hydroxide (LDH), , metal–organic frameworks (MOFs), − ionic polymers, − cationic covalent organic nanosheets (iCONs), and covalent organic frameworks (COFs), − among others . Resins, molecular compounds, and LDH-based adsorbents all have limitations due to their relatively low 99 TcO 4 – adsorption capacity and poor selectivity.…”

Section: Introductionmentioning

confidence: 99%

Modulating Anion Nanotraps via Halogenation for High-Efficiency ⁹⁹TcO₄^–/ReO₄^– Removal under Wide-Ranging pH Conditions

Yang

Hao

et al. 2023

Environ. Sci. Technol.

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Efficient and sustainable methods for 99 TcO 4 − removal from acidic nuclear waste streams, contaminated water, and highly alkaline tank wastes are highly sought after. Herein, we demonstrate that ionic covalent organic polymers (iCOPs) possessing imidazolium-N + nanotraps allow the selective adsorption of 99 TcO 4 − under wide-ranging pH conditions. In particular, we show that the binding affinity of the cationic nanotraps toward 99 TcO 4 − can be modulated by tuning the local environment around the nanotraps through a halogenation strategy, thereby enabling universal pH 99 TcO 4 − removal. A parent iCOP-1 possessing imidazolium-N + nanotraps showed fast kinetics (reaching adsorption equilibrium in 1 min), a high adsorption capacity (up to 1434.1 ± 24.6 mg/g), and exceptional selectivity for 99 TcO 4 − and ReO 4 − (nonradioactive analogue of 99 TcO 4 − ) removal in contaminated water. By introducing F groups near the imidazolium-N + nanotrap sites (iCOP-2), a ReO 4 − removal efficiency over 58% was achieved in 60 min in 3 M HNO 3 solution. Further, introduction of larger Br groups near the imidazolium-N + binding sites (iCOP-3) imparted a pronounced steric effect, resulting in exceptional adsorption performance for 99 TcO 4 − under super alkaline conditions and from lowactivity waste streams at US legacy Hanford nuclear sites. The halogenation strategy reported herein guides the task-specific design of functional adsorbents for 99 TcO 4 − removal and other applications.

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Enhanced adsorption and separation of Re(VII) using organic-inorganic hybrid silica adsorbent

Cited by 23 publications

References 37 publications

Adsorption Behavior of U(VI) and Re(VII) on Iron Sulfide Nanoparticles Modified with Titanate Nanotubes: Mechanism and Performance Insights

Adsorption Behavior of U(VI) and Re(VII) on Iron Sulfide Nanoparticles Modified with Titanate Nanotubes: Mechanism and Performance Insights

Application of Mesoporous Silicas for Adsorption of Organic and Inorganic Pollutants from Rainwater

Modulating Anion Nanotraps via Halogenation for High-Efficiency ⁹⁹TcO₄^–/ReO₄^– Removal under Wide-Ranging pH Conditions

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Enhanced adsorption and separation of Re(VII) using organic-inorganic hybrid silica adsorbent

Cited by 23 publications

References 37 publications

Adsorption Behavior of U(VI) and Re(VII) on Iron Sulfide Nanoparticles Modified with Titanate Nanotubes: Mechanism and Performance Insights

Adsorption Behavior of U(VI) and Re(VII) on Iron Sulfide Nanoparticles Modified with Titanate Nanotubes: Mechanism and Performance Insights

Application of Mesoporous Silicas for Adsorption of Organic and Inorganic Pollutants from Rainwater

Modulating Anion Nanotraps via Halogenation for High-Efficiency 99TcO4–/ReO4– Removal under Wide-Ranging pH Conditions

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Product

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Modulating Anion Nanotraps via Halogenation for High-Efficiency ⁹⁹TcO₄^–/ReO₄^– Removal under Wide-Ranging pH Conditions