Efficient removal of uranium (VI) by 3D hierarchical Mg/Fe-LDH supported nanoscale hydroxyapatite: A synthetic experimental and mechanism studies

Guo, Yihang; Gong, Zhiheng; Li, Chenxi; Gao, Bai; Li, Peng; Wang, Xuegang; Zhang, Bingcong; Li, Yongming

doi:10.1016/j.cej.2019.123682

Cited by 147 publications

(43 citation statements)

References 49 publications

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“…To clarify the reaction order and adsorption mechanism of the adsorption process of ZnAl-LDO-BC, the following adsorption kinetics models were adopted: pseudo-first-order (PFO, formula ), pseudo-second-order (PSO, formula ), and intraparticle diffusion model (IPD, formula ). , where Q e and Q t (mg/g) are the theoretical adsorption capacity and adsorption capacity at time t , respectively; k 1 , k 2 , and k 3 are the PFO, PSO, and IPD constants, respectively; and C is the boundary effect constant, wherein a larger value indicates more stability.…”

Section: Results and Discussionmentioning

confidence: 99%

Strong Adsorption of Phosphorus by ZnAl-LDO-Activated Banana Biochar: An Analysis of Adsorption Efficiency, Thermodynamics, and Internal Mechanisms

Deng

et al. 2021

ACS Omega

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Zn–Al layered bimetallic composites were prepared by ethanol strengthening and co-precipitation using banana straw as a raw material. A high-efficiency phosphorus adsorbent (ZnAl-LDO-BC) was obtained by calcination at a high temperature. The kinetics and thermodynamics of phosphorus adsorption on ZnAl-LDO-BC were then studied. The results showed that the adsorption process of ZnAl-LDO-BC corresponds with the pseudo-second-order (PSO) kinetic equation and the Langmuir model. The theoretical maximum adsorption capacity of ZnAl-LDO-BC is 111.11 mg/g (at 45 °C, 500 mg/L phosphorus initial concentration). The influence of anions on phosphorus adsorption decreased in strength in the following order: CO3 2– > SO4 2– > NO3 –. Scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), Fourier transform infrared (FTIR) spectroscopy, and X-ray diffraction (XRD) were used to characterize the adsorption of phosphorus on ZnAl-LDO-BC and showed that ZnAl-LDO-BC can efficiently adsorb phosphorus. The adsorption mechanism utilizes both O–H and C–H on the surface of ZnAl-LDO-BC for the adsorption of PO4 3–, forming Zn3(PO4)2·4H2O via complexation precipitation; additionally, biochar surface adsorption and interlayer adsorption are indispensable forms of phosphate adsorption. With the systematic study of phosphorus adsorption by ZnAl-LDO-BC, a novel green technology was developed for addressing phosphorus pollution.

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Section: Results and Discussionmentioning

confidence: 99%

Strong Adsorption of Phosphorus by ZnAl-LDO-Activated Banana Biochar: An Analysis of Adsorption Efficiency, Thermodynamics, and Internal Mechanisms

Deng

et al. 2021

ACS Omega

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“…A new strong double peak for the antisymmetric vibration of [O=UVI=O] 2+ appeared in the XPS spectra of the HAP@CoFe2O4 reacted with U(VI), which was consistent with the EDS elemental mapping results (Figure S1), suggesting that uranium was successfully adsorbed on the surface of the material. The high resolution of the U 4f spectrum (Figure 5b) can be well fitted at binding energies of 383.3 (U 4f7/2) and 394.0 eV (U 4f5/2), indicating that the valence of uranium did not change during the adsorption process [55,56]. The Co spectrum (Figure S2a) revealed two peaks at binding energies 782.58 and 786.84 eV, which were attributed to Co 2p3/2 and its shake-up satellites, respectively, whereas peaks at higher binding energies (~797.81 and 804.44 eV) corresponded to Co 2p1/2 and their shakeup satellites, respectively [57].…”

Section: U(vi) Removal Mechanismsmentioning

confidence: 90%

Fast and Efficient Removal of Uranium onto a Magnetic Hydroxyapatite Composite: Mechanism and Process Evaluation

Tao

Peng

et al. 2021

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The exploration and rational design of easily separable and highly efficient sorbents with satisfactory capability of extracting radioactive uranium (U)-containing compound(s) are of paramount significance. In this study, a novel magnetic hydroxyapatite (HAP) composite (HAP@ CoFe2O4), which was coupled with cobalt ferrite (CoFe2O4), was rationally designed for uranium(VI) removal through a facile hydrothermal process. The U(VI) ions were rapidly removed using HAP@ CoFe2O4 within a short time (i.e., 10 min), and a maximum U(VI) removal efficiency of 93.7% was achieved. The maximum adsorption capacity (Qmax) of the HAP@CoFe2O4 was 338 mg/g, which demonstrated the potential of as-prepared HAP@CoFe2O4 in the purification of U(VI) ions from nuclear effluents. Autunite [Ca(UO2)2(PO4)2(H2O)6] was the main crystalline phase to retain uranium, wherein U(VI) was effectively extracted and immobilized in terms of a relatively stable mineral. Furthermore, the reacted HAP@CoFe2O4 can be magnetically recycled. The results of this study reveal that the suggested process using HAP@CoFe2O4 is a promising approach for the removal and immobilization of U(VI) released from nuclear effluents.

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“…Meanwhile, the high intensity double-peaking concerned with the antisymmetric vibration of [O = U(VI)= O] 2+ , which can be observed in the XPS spectra after U(VI) adsorption. Through deconvolution of U(VI) peaks, the tting results of U 4f 7/2 and U 4f 5/2 appeared at approximately 381.9 eV and 392.8 eV for HAP after U(VI) adsorption, indicating no existence of oxidation and reduction during the adsorption process(Ahmed et al, 2021;Guo et al, 2020). Contrarily, the U 4f spectra of HAP@CMK-3 after adsorption can be resolved into U 4f 5/2…”

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confidence: 92%

High-speed and efficient removal of uranium (VI) from aqueous solution by hydroxyapatite-modified ordered mesoporous carbon (CMK-3)

Минг

Deng

Ren

et al. 2022

Environ Sci Pollut Res

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In recent years, the synthesis and application of green, cost-effective and sustainable materials for uranium (VI) removal was signi cant to environmental protection. The ordered mesoporous carbon (CMK-3) supported different mass of hydroxyapatite materials (HAP@CMK-3) were facilely synthesized via hydrothermal method. The resultant materials were characterized by XRD, FT-IR, BET, SEM, TEM-mapping and XPS, and implemented for immobilizing U(VI). Not only the speci c surface area of HAP (7.01 m 2 /g) was increased by the loading on CMK-3 (818.37 m 2 /g), but also the adsorption capacity of CMK-3 was increased by HAP modi cation.Impressively, HAP@CMK-3 exhibited highly adsorption capacity of U(VI) with the increase of HAP deposition and was capable of achieving fast reaction. Therein to, the speci c surface area of HAP@CMK-3(2:1) was 253.68 m 2 /g, as well as the adsorption capacity was up to 1072 mg/g ( tted by Langmuir isotherm, at pH = 3.0, 298 K) and the adsorption process was completed in 30 min (followed by pseudo-second-order kinetic).

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Efficient removal of uranium (VI) by 3D hierarchical Mg/Fe-LDH supported nanoscale hydroxyapatite: A synthetic experimental and mechanism studies

Cited by 147 publications

References 49 publications

Strong Adsorption of Phosphorus by ZnAl-LDO-Activated Banana Biochar: An Analysis of Adsorption Efficiency, Thermodynamics, and Internal Mechanisms

Strong Adsorption of Phosphorus by ZnAl-LDO-Activated Banana Biochar: An Analysis of Adsorption Efficiency, Thermodynamics, and Internal Mechanisms

Fast and Efficient Removal of Uranium onto a Magnetic Hydroxyapatite Composite: Mechanism and Process Evaluation

High-speed and efficient removal of uranium (VI) from aqueous solution by hydroxyapatite-modified ordered mesoporous carbon (CMK-3)

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