Effective adsorption and immobilization of Cr(VI) and U(VI) from aqueous solution by magnetic amine-functionalized SBA-15

Liu, Fenglei; Wang, Anjie; Xiang, Miao; Hu, Qingyuan; Hu, Baowei

doi:10.1016/j.seppur.2021.120042

Cited by 79 publications

(6 citation statements)

References 47 publications

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“…The peaks at about 1430 cm −1 and 1085 cm −1 would be assigned to the C-H and C-O bending vibrations, respectively. However, for biochar-PDA/PEI, it was found that the intensity of peaks for −OH and C = O significantly increased after surface modification, which may be due to the introduction of PDA and PEI on the surface (Liu et al 2022). The FTIR spectra of Ti 3 C 2 T x exhibited two typical characteristic peaks at 3443 and 549 cm −1 , which indicated that a large amount of -OH and Ti-OH groups existed on the surface of MXenes (Hu et al 2021).…”

Section: Adsorbent Characterizationmentioning

confidence: 92%

Constructing coconut shell biochar/MXenes composites through self-assembly strategy to enhance U(VI) and Cs(I) immobilization capability

Liu

Wang

Zhao

et al. 2023

Biochar

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Herein, a biochar-based composite (Ti3C2Tx@biochar-PDA/PEI) was constructed by decorating Ti3C2Tx and polydopamine on coconut shell biochar via electrostatic self-assembly method. Different characterization techniques were applied to explore the structure, morphology and composition of the sorbents. It was found that the higher porosity and diverse functional groups were conducive for Ti3C2Tx@biochar-PDA/PEI to capture radionuclides, and the water environmental conditions made a great contribution to the adsorption process. The process of removing U(VI)/Cs(I) well complied with the Langmuir isotherm and Pseudo-second-order equations, which indicated that the single layer chemical adsorption occurred on the solid liquid interface. Meanwhile, this produced composite exhibited superior removal performance under complex co-existing ion environment, and the maximum adsorption amounts of U(VI) and Cs(I) reached up to 239.7 and 40.3 mg g−1. Impressively, this adsorbent still exhibited good adsorption performance after three cycles of regeneration. The spectral analysis and DFT calculation demonstrated that adsorption of U(VI) might be a chemical process, while the adsorption of Cs(I) should be ion exchange or electrostatic attraction. This study demonstrated the potential application of Ti3C2Tx@biochar-PDA/PEI as an effective remediation strategy for radioactive wastewater cleanup. Graphical Abstract

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Section: Adsorbent Characterizationmentioning

confidence: 92%

Constructing coconut shell biochar/MXenes composites through self-assembly strategy to enhance U(VI) and Cs(I) immobilization capability

Liu

Wang

Zhao

et al. 2023

Biochar

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“…So, the negative Cr( vi ) species (HCrO 4 − ) is easily assimilated by CoFe 2 O 4 @SiO 2 – NH 2 through electrostatic attraction. 56 As shown in Fig. 5d, the C 1s spectrum exhibits a slight shift towards a high binding energy (286 eV), which belongs to the C–O–H bond oxidized from the C–H bond by reducing Cr( vi ) to Cr( iii ).…”

Section: Resultsmentioning

confidence: 86%

Enhanced Cr(vi) removal by hierarchical CoFe₂O₄@SiO₂–NH₂via reduction and adsorption processes

et al. 2022

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“…[32][33][34][35][36] These o-quinone moieties subsequently engage in multiple secondary reactions with diverse functional groups, including amines and thiols, rendering TA a promising candidate for coating applications. [37][38][39] In addition, TA and Fe are both commonly available, inexpensive, and safe. [40,41] This low-cost, rapid, and green method of forming a coating has motivated further research into the use of this TA−Fe complex to create a novel 2D Janus nanosheet, which has not been previously reported.…”

Section: Introductionmentioning

confidence: 99%

Free‐Standing Janus Nanosheets: Ultrafast Self‐Assembly and Versatile Biphase‐Application

Li,

Jiang,

Wang

et al. 2024

Adv Funct Materials

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The development of stable Janus architectures suitable for biphasic applications holds significant importance. A novel approach is introduced for interfacial supramolecular self‐assembly, resulting in 2D Janus nanosheets (OA‐TA/Fe) exhibiting an amphiphilic nature. These nanosheets consist of hydrophilic coordination complexes of ferric ions (Fe3+) and tannic acid (TA) on one side of both surfaces and hydrophobic alkyl chains on the other side of both surfaces. The synthesis of these 2D Janus nanosheets involves a simple, ultrafast, and environmentally benign process, eliminating the need for time‐consuming multistep procedures and harsh synthetic conditions typically associated with Janus architecture formation. By exploiting the inherent singular anisotropic wettability inherent in OA‐TA/Fe‐2, the efficacy of these innovative Janus nanosheets in the efficient separation of various organic liquid‐in‐water and water‐in‐organic liquid emulsions is elucidated. Subsequent post‐modification of OA‐TA/Fe has facilitated the highly efficient remediation of contaminated oily wastewater, serving as a model biphasic catalysis reaction, wherein the Janus nanosheets function simultaneously as emulsifiers and catalysts within biphasic mixtures. The methodology establishes a rapid self‐assembly approach for the creation of amphiphilic free‐standing Janus nanosheets, offering compelling prospects for their application in diverse fields, as exemplified by, but not limited to, the case studies presented herein.

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Effective adsorption and immobilization of Cr(VI) and U(VI) from aqueous solution by magnetic amine-functionalized SBA-15

Cited by 79 publications

References 47 publications

Constructing coconut shell biochar/MXenes composites through self-assembly strategy to enhance U(VI) and Cs(I) immobilization capability

Constructing coconut shell biochar/MXenes composites through self-assembly strategy to enhance U(VI) and Cs(I) immobilization capability

Enhanced Cr(vi) removal by hierarchical CoFe₂O₄@SiO₂–NH₂via reduction and adsorption processes

Free‐Standing Janus Nanosheets: Ultrafast Self‐Assembly and Versatile Biphase‐Application

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Effective adsorption and immobilization of Cr(VI) and U(VI) from aqueous solution by magnetic amine-functionalized SBA-15

Cited by 79 publications

References 47 publications

Constructing coconut shell biochar/MXenes composites through self-assembly strategy to enhance U(VI) and Cs(I) immobilization capability

Constructing coconut shell biochar/MXenes composites through self-assembly strategy to enhance U(VI) and Cs(I) immobilization capability

Enhanced Cr(vi) removal by hierarchical CoFe2O4@SiO2–NH2via reduction and adsorption processes

Free‐Standing Janus Nanosheets: Ultrafast Self‐Assembly and Versatile Biphase‐Application

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Enhanced Cr(vi) removal by hierarchical CoFe₂O₄@SiO₂–NH₂via reduction and adsorption processes