Efficient adsorption and reduction of Cr(VI) and U(VI) by nanoscale zero-valent iron supported on polydopamine-decorated SBA-15

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

doi:10.1016/j.apsusc.2021.150931

Cited by 51 publications

(10 citation statements)

References 40 publications

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“…The adsorption of U(VI) on MoS 2 and nZVI/MoS 2 gradually increased with the increase of pH from 2.0 to 6.0 and reached the highest removal at pH 6.0–9.0 (92 and 95.0% for MoS 2 and nZVI/MoS 2 , respectively). However, the decreased removal of U(VI) at pH >10 was observed, which was similar to previous studies. − The pH-dependent removal of U(VI) on nZVI/MoS 2 can be interpreted by the electrostatic interaction between U(VI) and adsorbents. The low adsorption of U(VI) on nZVI/MoS 2 and MoS 2 at low pH could be due to the electrostatic repulsion of positively charged adsorbents and positive UO 2 2+ , while the decreased adsorption of U(VI) at high pH can also be interpreted by electrostatic repulsion of negatively charged adsorbents and negative U(VI) species such as UO 2 (CO 3 ) 2 2– and UO 2 (CO 3 ) 3 4– species.…”

Section: Resultssupporting

confidence: 89%

The Removal Mechanism of U(VI) on nZVI/MoS₂ Composites Investigated by Batch, Spectroscopic, and Modeling Techniques

et al. 2023

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A novel nanoscale zero-valent iron/molybdenum disulfide (nZVI/MoS 2 ) composite was synthesized and well characterized in detail. The as-prepared materials were applied for the removal of U(VI) from water solutions under various experimental conditions. The characterizations showed that nZVI/MoS 2 composites exhibited a high surface area and uniform distribution of nZVI. The maximum adsorption capacities of nZVI/MoS 2 obtained from the Langmuir model (71.8 mg/g at pH 4.0 and 25 °C) were higher than that of MoS 2 (39.92 mg/g) due to the synergistic effect. According to the fitting of surface complexation modeling, U(VI) removal on nZVI/MoS 2 included cation exchange and inner-sphere surface complexation at low and high pH, respectively, whereas the adsorbed U(VI) was partly reduced into U(IV) by nZVI/MoS 2 composites. According to analysis of XPS analysis, the enhanced removal of U(VI) on nZVI/MoS 2 was due to the complexation of U(VI) with various oxygenated functional groups (e.g., −OH, Fe−O, and Mo−O functional groups) and then adsorbed U(VI) was reduced to U(IV) by Fe 0 and/or Fe(II). These findings showed that nZVI/MoS 2 could be used as efficient adsorbents for the high elimination of U(VI) from contaminated wastewater in environmental pollution cleanup.

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Section: Resultssupporting

confidence: 89%

The Removal Mechanism of U(VI) on nZVI/MoS₂ Composites Investigated by Batch, Spectroscopic, and Modeling Techniques

et al. 2023

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“…Remedial efforts employing nZVI via reduction have been performed on 1,2-dichloroethylene (DCE), 28 trichloroethylene (TCE), [29][30][31][32] perchloroethylene (PCE), 28 1,1,1-trichloro-2,2-bis(4-chlorophenyl) ethane (DDT), 33 2,4-dichlorophenol (2,4-DCP), [34][35][36][37] trichloronitromethane (TCNM), 38 1,2,4-trichlorobenzene (1,2,4-TCB), 39 2,4,6-trichlorophenol (TCP), 40,41 2chlorobiphenyl (PCB1), 42,43 diclofenac (DCF), 44 chlorinated organophosphate esters (Cl-OPEs), 45 2,2 0 ,4,4 0 -tetrabromodiphenyl ether (BDE-47), 46,47 tetrabromobisphenol A (TBBPA), 48,49 methylene blue, 50 p-nitrophenol, 51,52 nitrobenzene, 53,54 mono-brominated diphenyl ether (BDE-3), 55 Cr(VI), [56][57][58][59][60][61] Sb(V), 62 Ni(II), [63][64][65][66] Pb(II), 65,67 Cu(II), 68 As(V), 69 U(VI), 23,[70][71]...…”

Section: Chemical Reduction By Nzvimentioning

confidence: 99%

“…16F-J). 23,71 The competitive adsorption of U(VI) and Cr(VI) can occur in an insufficient adsorption sites situation, which may result in low removal efficiency. 71…”

Section: Hcromentioning

confidence: 99%

Environmental remediation approaches by nanoscale zero valent iron (nZVI) based on its reductivity: a review

Liu,

Chen,

et al. 2024

RSC Adv.

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“…Besides, loading the metal nanoparticles onto SBA-15 to form nanocomposites have been used for removal of heavy metals from water. For example, nanoscale zero-valent iron (nZVI) composites by loading into polydopamine (PDA)decorated SBA-15 exhibited the excellent removal capacity of Cr(VI) and U(VI) from aqueous solutions (Liu et al 2021). Moreover, the SBA-15@Fe/Ni composite prepared via loading nZVI onto SBA-15 as a support, showed the enhanced stability and removal capacity for Cr(VI) adsorption and reduction (Xing et al 2023).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of calcium carbonate–loaded mesoporous SBA-15 nanocomposites for removal of phosphate from solution

Tang

Wang

Sun

et al. 2023

Environ Sci Pollut Res

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Removal of phosphate from water is very crucial for protecting the ecological environment since massive phosphorus fertilizers has been widely used and caused serious water deterioration. Thus, we fabricated a series of calcium carbonate loaded mesoporous SBA-15 nanocomposites with different Ca:Si molar ratio (CaAS-x) as phosphorus adsorbents via a simple wet-impregnation method. The multiply approach including XRD, N 2 physisorption, TG-MS and FT-IR were used to characterize the structure, morphology and composition of mesoporous CaAS-x nanocomposites. The phosphate adsorption e ciency of the CaAS-x nanocomposites was studied through adsorption and desorption batch tests. Results showed that the increases of Ca:Si molar ratio (rCa:Si) favored the phosphate removal e ciency of CaAS nanocomposites, especially CaAS with the optimum molar ratio of Ca:Si as 0.55 showed the high adsorption capacity of 92.0 mg•g -1 to high concentration of phosphate (> 200 mg l -1 ). Note that the adsorption capacity of the CaAS-x exponentially fast grew up with increasing the phosphate concentration. Apparently, mesoporous structure of SBA-15 contributed to high disperse of CaCO 3 nanoparticles leading to the multiplayer formation and fast growth of phosphate calcium precipitation. Therefore, mesoporous CaAS-0.55 nanocomposite is an environmental-friendly adsorbent for effective removal of high concentration of phosphate in neutral contaminated wastewater.

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Efficient adsorption and reduction of Cr(VI) and U(VI) by nanoscale zero-valent iron supported on polydopamine-decorated SBA-15

Cited by 51 publications

References 40 publications

The Removal Mechanism of U(VI) on nZVI/MoS₂ Composites Investigated by Batch, Spectroscopic, and Modeling Techniques

The Removal Mechanism of U(VI) on nZVI/MoS₂ Composites Investigated by Batch, Spectroscopic, and Modeling Techniques

Environmental remediation approaches by nanoscale zero valent iron (nZVI) based on its reductivity: a review

Synthesis of calcium carbonate–loaded mesoporous SBA-15 nanocomposites for removal of phosphate from solution

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Efficient adsorption and reduction of Cr(VI) and U(VI) by nanoscale zero-valent iron supported on polydopamine-decorated SBA-15

Cited by 51 publications

References 40 publications

The Removal Mechanism of U(VI) on nZVI/MoS2 Composites Investigated by Batch, Spectroscopic, and Modeling Techniques

The Removal Mechanism of U(VI) on nZVI/MoS2 Composites Investigated by Batch, Spectroscopic, and Modeling Techniques

Environmental remediation approaches by nanoscale zero valent iron (nZVI) based on its reductivity: a review

Synthesis of calcium carbonate–loaded mesoporous SBA-15 nanocomposites for removal of phosphate from solution

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The Removal Mechanism of U(VI) on nZVI/MoS₂ Composites Investigated by Batch, Spectroscopic, and Modeling Techniques

The Removal Mechanism of U(VI) on nZVI/MoS₂ Composites Investigated by Batch, Spectroscopic, and Modeling Techniques