Phosphorous‐Based Pillar[5]arenes for Uranyl Extraction

Bai, Bing; Fang, Yuyu; Gan, Quan; Yang, Yuanyou; Yuan, Lihua; Feng, Wen

doi:10.1002/cjoc.201400899

Cited by 26 publications

(2 citation statements)

References 56 publications

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“…It was found that the P–Fe–CMK-3 adsorbent had higher adsorption affinity toward UO 2 2+ as compared to the other heavy metals. This selectivity was contributed by several factors such as (i) HSAB principle which states uranyl is hard acid and prefer to bind hard bases (O over S, N over P), (ii) f orbitals of uranium interact more strongly with donor ligands than the d orbitals of the heavy metals, (iii) UO 2 2+ competes with H + to bond with either PO or PO – oxygen atoms within phosphonate functional groups. The coordinating ability of neutral PO group arises by the donation of lone pairs of electrons to unoccupied molecular orbitals of UO 2 2+ whereas, negative charge on the PO – group interacts with UO 2 2+ through electrostatic forces, and (iv) UO 2 2+ has a linear structure (OUO) unlike the common heavy metals which exists in their divalent forms (M 2+ ) at low pH except As 5+ , and Cr 6+ which predominantly exists in their anionic forms such as H 2 AsO 4 – and HCrO 4 – , respectively So, due to difference in charge and structure, the linear UO 2 2+ ion could be better accommodated by the phosphonate chelating groups and the mesopores in P–Fe–CMK-3.…”

Section: Resultsmentioning

confidence: 99%

Superparamagnetic Adsorbent Based on Phosphonate Grafted Mesoporous Carbon for Uranium Removal

Husnain¹,

Kim²,

Um³

et al. 2017

Ind. Eng. Chem. Res.

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A direct approach was presented to graft phosphonate groups on magnetic mesoporous carbon by an impregnation method with environmentally friendly precursors unlike the conventional methods involving a series of complicated steps and harsh conditions. Through the in situ reduction of Fe3+, magnetite particles of ∼10 nm were successfully embedded into the mesopores, which was confirmed by HR-TEM. Surface characterization by X-ray photoelectron spectroscopy and Fourier transform infrared revealed phosphonate functional groups anchored through multidentate bonding with the surface of P–Fe–CMK-3. Due to the combined advantages of mesoporous pore size (5.5 nm), phosphonate ligands (1.42 mmol g–1), and magnetic sensitivity (5.20 emu g–1), this multifunctional adsorbent captured >85% of UO2 2+ within 5 min and the maximum adsorption capacity was 150 mg g–1 at pH 4. The exceptionally high selectivity and efficiency of P–Fe–CMK-3 toward uranyl capture even in groundwater (K d = 1 × 105 mL g–1), radioactive wastewater (K d = 3 × 104 mL g–1), and seawater (K d = 1 × 104 mL g–1) at V/m = 1000 mL g–1 was better than that of the previously reported adsorbents. Importantly, the adsorbent maintained UO2 2+ adsorption efficiency >99% over five cycles due to the excellent chemical and structural stabilities. Above all, the adsorbent could be manipulated for UO2 2+ capture with help of a magnetic field in the real world, especially in case of nuclear accidents, decommissioning of nuclear power plants and/or uranium recovery from seawater.

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Section: Resultsmentioning

confidence: 99%

Superparamagnetic Adsorbent Based on Phosphonate Grafted Mesoporous Carbon for Uranium Removal

Husnain¹,

Kim²,

Um³

et al. 2017

Ind. Eng. Chem. Res.

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“…当 pH 值较低时, 零价铁容易被腐蚀, 从而形成铁离子, 同时生成丰富的 H ＋ , 有益于溶液中的加氢反应; 而当 pH 值较高时, 零价铁的表层容易形成铁的氢氧化物, 同样铁的氢氧化物呈现出更进一步的吸附性能 [112,113] . [116,117] . 如图 17(a)所示, 研究了纳米零价铁以铁氧化物颗粒(包含有纳米零价铁和铁的氧化物)对铀的去除 [116] , 结果表明不同溶度的铁纳米粒子对铀的去除效果都非常好, 最终水溶液中的铀溶度都低于 1 μg/L, 另外文章还报道去除时间很短, 能在 2 min 内达到 90%的去除率.…”

Section: Figure 15unclassified

Synthesis of Functional Nanoscale Zero-Valent Iron Composites for the Application of Radioactive Uranium Enrichment from Environment: A Review

Chen¹,

Huang²,

Zhang³

et al. 2017

Acta Chim. Sinica

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With the widespread using of nuclear energy, the nuclear technology is developed rapidly and the radionuclide pollution such as uranium has become the serious problem for human health. Nanoscale Zero-Valent Iron (nZVI) has become the excellent adsorbent for the removal of uranium ions from environment because of its low cost, easy preparation, high surface-activity and excellent performance for adsorption of uranium. Due to synergistic effect of each monomer, the nZVI nanocomposites have been applied to remove radionuclides and the adsorption capacity of nZVI nanocomposites are improved to a further level. Hence, the preparation of nZVI and its nanocomposites for the efficient removal of radionuclides is one of the hot issues in the field of environmental science. The aim of this review is to summarize and outlook the recent research on the application of nZVI nanocomposites for the efficient removal of radioactive uranium from environment. The preparation of nZVI and its composites, the removal efficiency and removal mechanism has been summarized, and the application of the nZVI nanocomposites in environmental pollution cleanup has also been discussed, expecting for the reference of practical application and future research.

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pH‐Responsive Host−Guest Complexation between a Water‐solublePillar[7]Arene and a 2,7‐Diazapyrenium Salt and Its Application inControllable Self‐assembly

Yang

Huang

2017

Chin. J. Chem.

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A novel host−guest recognition motif based on a water‐soluble pillar[7]arene (WP7) and a 2,7‐diazapyrenium salt (DMDAP) was prepared. According to the integrated results of 1H NMR, 2D NOESY, UV–vis spectroscopy and fluorescence titration experiments, we demonstrated that the molecular recognition of WP7 to DMDAP in water not only has high association constant but also has pH‐responsiveness. Subsequently, we took advantage of this molecular recognition motif to fabricate a supra‐amphiphile based on WP7 and an amphiphilic 2,7‐diazapyrenium derivative DAPAC. Its controllable self‐assembly in water was also investigated by means of TEM and DLS techniques.

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Phosphorous‐Based Pillar[5]arenes for Uranyl Extraction

Abstract: One phosphine oxide-based pillar [5]

Cited by 26 publications

References 56 publications

Superparamagnetic Adsorbent Based on Phosphonate Grafted Mesoporous Carbon for Uranium Removal

Superparamagnetic Adsorbent Based on Phosphonate Grafted Mesoporous Carbon for Uranium Removal

Synthesis of Functional Nanoscale Zero-Valent Iron Composites for the Application of Radioactive Uranium Enrichment from Environment: A Review

pH‐Responsive Host−Guest Complexation between a Water‐solublePillar[7]Arene and a 2,7‐Diazapyrenium Salt and Its Application inControllable Self‐assembly

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