Enhanced capacity of fluoride scavenging from contaminated water by nano-architectural reorientation of cerium-incorporated hydrous iron oxide with graphene oxide

Mukhopadhyay, Kankan; Ghosh, Uday Chand; Sasikumar, Palani

doi:10.1007/s11356-019-05756-0

Cited by 16 publications

(3 citation statements)

References 47 publications

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“…Furthermore, the material Ce@Al1:1 MOF composite shows a nanopetal-assembled flower-like morphology. Figure b displays the TEM images used to further confirm the shape of the produced MOFs composites Ce@Fe1:1 . The TEM images of bimetal MOFs Ce@Al1:1 and Ce@La1:1 are illustrated in Figure S2a,b, respectively.…”

Section: Resultsmentioning

confidence: 85%

Cerium-Based Nanoporous Metal–Organic Frameworks Incorporated with Different Metals for the Remediation of Fluoride Ions from Water

Sikha,

Mandal

2024

ACS Appl. Nano Mater.

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The adsorption capacity (AC) of the material can be significantly enhanced by the composite synergy between various metals, which in turn modifies the morphology, structure, and functional groups of the material. In this view, the nanoporous bimetal metal−organic frameworks (MOFs) using metals (Ce, Fe, Al, and La), namely, Ce@Fe1:1, Ce@Al1:1, and Ce@La1:1, were synthesized via a one-pot method. The nanoporous bimetal MOFs applied to remove F − ions from drinking water followed the order of Ce@Fe1:1 > Ce@Al1:1 > Ce@La1:1. Based on the above findings, Ce@Fe1:1 was further synthesized using cerium and iron at different molar ratios to optimize the best possible compositions, namely, Ce-Fu, Ce@Fe2:1, Ce@Fe1:1, Ce@Fe1:2, and Fe-Fu. These nanoporous bimetal MOF composites were applied to remediate the F − ion from wastewater and Ce@Fe1:1 exhibited the maximum AC of 84.4 mg g −1 at 288 K. It is worth mentioning that the utilization of ultrasonication as a mediator for the adsorption study over the conventional method gives excellent relaxation in time as it enhances the reaction kinetics. As a result, the study demonstrated rapid adsorption kinetics, which follows the pseudosecond-order (PSO) model. Moreover, coexisting ions such as NO 3 − , Cl − , HCO 3 − , and SO 4 2− had less effect on the adsorption of fluoride. The adsorption mechanism of Ce@Fe1:1 bimetal MOFs supports the electrostatic attraction and ligand exchange processes, which were confirmed using characterization instruments, such as X-ray photoelectron spectroscopy (XPS) and zeta potential.

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Section: Resultsmentioning

confidence: 85%

Cerium-Based Nanoporous Metal–Organic Frameworks Incorporated with Different Metals for the Remediation of Fluoride Ions from Water

Sikha,

Mandal

2024

ACS Appl. Nano Mater.

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“…In the Ce 3d spectra, the distinctive peaks of elemental Ce are seen at 889.1 eV, 894.2 eV, 898.5 eV, 903.2 eV, 907.1 eV, 916.5 eV in Ce doped samples as shown in Figure 3c. The peaks at 889.1 eV, 898.5 eV, 907.1 eV, and 916.5 eV originated from the Ce 4+ [39]. Precisely, the former two peaks correspond to the Ce 3d5/2 orbital and the latter to the Ce 3d3/2 orbital.…”

Section: Chemical Composition and Surface Informationmentioning

confidence: 95%

Cerium-Doped Iron Oxide Nanorod Arrays for Photoelectrochemical Water Splitting

et al. 2022

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In this work, a simple one-step hydrothermal method was employed to prepare the Ce-doped Fe2O3 ordered nanorod arrays (CFT). The Ce doping successfully narrowed the band gap of Fe2O3, which improved the visible light absorption performance. In addition, with the help of Ce doping, the recombination of electron/hole pairs was significantly inhibited. The external voltage will make the performance of the Ce-doped sample better. Therefore, the Ce-doped Fe2O3 has reached superior photoelectrochemical (PEC) performance with a high photocurrent density of 1.47 mA/cm2 at 1.6 V vs. RHE (Reversible Hydrogen Electrode), which is 7.3 times higher than that of pristine Fe2O3 nanorod arrays (FT). The Hydrogen (H2) production from PEC water splitting of Fe2O3 was highly improved by Ce doping to achieve an evolution rate of 21 μmol/cm2/h.

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“…This surface charge favors the electrostatic attraction of the fluoride ions since as pH is increased, there exists an increase in the mechanism of ion interchange. Mukhopadhyay et al [80] obtained a composite material by applying a method of wet deposition to modify the ferric oxide (III) incorporating with Ce (IV) (CIHFO) and coupling with the hydrophilic GO (GO-CIHFO). The surface area of the GO-CIHFO composite is 189.57 m 2 g −1 , which is higher than the pristine CIHFO composite (around 140.71 m 2 g −1 ), with an irregular surface morphology that consists of microcrystals of 2-3 nm in size and a mesopore structure of 3.54 nm.…”

Section: Fluoridementioning

confidence: 99%

Graphene-Based Adsorbents for Arsenic, Fluoride, and Chromium Adsorption: Synthesis Methods Review

et al. 2022

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Water contamination around the world is an increasing problem due to the presence of contaminants such as arsenic, fluoride, and chromium. The presence of such contaminants is related to either natural or anthropogenic processes. The above-mentioned problem has motivated the search for strategies to explore and develop technologies to remove these contaminants in water. Adsorption is a common process employed for such proposals due to its versatility, high adsorption capacity, and lower cost. In particular, graphene oxide is a material that is of special interest due to its physical and chemical properties such as surface area, porosity, pore size as well as removal efficiency for several contaminants. This review shows the advances, development, and perspectives of materials based on GO employed for the adsorption of contaminants such as arsenite, arsenate, fluoride, and hexavalent chromium. We provided a detailed discussion of the synthesis techniques and their relationship with the adsorption capacities and other physical properties as well as pH ranges employed to remove the contaminants. It is concluded that the adsorption capacity is not proportional to the surface area in all the cases; instead, the synthesis method, as well as the functional groups, play an important role. In particular, the sol–gel synthesis method shows better adsorption capacities.

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Enhanced capacity of fluoride scavenging from contaminated water by nano-architectural reorientation of cerium-incorporated hydrous iron oxide with graphene oxide

Cited by 16 publications

References 47 publications

Cerium-Based Nanoporous Metal–Organic Frameworks Incorporated with Different Metals for the Remediation of Fluoride Ions from Water

Cerium-Based Nanoporous Metal–Organic Frameworks Incorporated with Different Metals for the Remediation of Fluoride Ions from Water

Cerium-Doped Iron Oxide Nanorod Arrays for Photoelectrochemical Water Splitting

Graphene-Based Adsorbents for Arsenic, Fluoride, and Chromium Adsorption: Synthesis Methods Review

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