Bio-waste assisted phase transformation of Fe3O4/carbon to nZVI/graphene composites and its application in reductive elimination of Cr(VI) removal from aquifer

Mon, Phyu Phyu; Cho, Phyu Phyu; Chanadana, L.; Kumar, Kamlesh; Dobhal, Saiyam; Thatikonda, Shashidhar; Madras, Giridhar; Subrahmanyam, Ch.

doi:10.1016/j.seppur.2022.122632

Cited by 12 publications

(16 citation statements)

References 45 publications

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“…The BET surface area of the synthesized Fe 3 O 4 and Fe 3 O 4 ‐Carbon nanocomposites was 166 m 2 g −1 with a total pore volume of 0.103 cm 3 g −1 . The pore size distribution analysis using BJH (Barrett‐Joyner‐Halenda) method from desorption part of the isotherm of Fe 3 O 4 and Fe 3 O 4 ‐Carbon nanocomposites (Figure 3b) reveals a very narrow pore size distribution [48,49] …”

Section: Resultsmentioning

confidence: 99%

“…Modified Co-precipitation method has been employed to synthesize the Fe 3 O 4 -Carbon nanocomposites. [48][49][50] In first step of the synthesis, aqueous solution of 0.2 M FeCl 3 . 3H 2 O and 0.3 M FeCl 3 .…”

Section: Synthesis Of Materialsmentioning

confidence: 99%

“…The pore size distribution analysis using BJH (Barrett-Joyner-Halenda) method from desorption part of the isotherm of Fe 3 O 4 and Fe 3 O 4 -Carbon nanocomposites (Figure 3b) reveals a very narrow pore size distribution. [48,49] The X-ray photoelectron spectroscopy (XPS) analysis, conducted within the energy range of 0 to 1000 eV (as shown in Figure 4a), revealed the existence of carbon, oxygen, and iron elements originating from the Fe 3 O 4 nanostructures and carbon matrix. The Fe 2p spectra exhibited in Figure 4b which have two distinct peaks at energy levels of 724 and 709 electron volts (eV), which may be attributed to the Fe 2p 1/2 and Fe 2p 3/2 orbitals of the Fe 3 O 4 nanostructures, respectively.…”

Section: Physical Characterizationsmentioning

confidence: 99%

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Fabrication of Highly Porous and Sheet Like Fe₃O₄‐Carbon Nanocomposites: A Versatile Catalyst for Electrocatalytic Oxygen Evolution Reactions

Shanmugapriya,

Kumar,

Afzal

et al. 2024

ChemistrySelect

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Fuel cells and metal‐air batteries are examples of renewable energy technologies that depend on having highly effective electrocatalysts for the oxygen evolution reaction (OER). In this study, a mesoporous nanostructure composed of Fe3O4‐Carbon nanocomposites was synthesised using a simple and economically viable approach at a relatively low temperature. The observed catalytic activity of the prepared defected Fe3O4‐Carbon nanocomposites mesoporous nanostructure was found to be remarkable. Additionally, the nanostructure exhibited a high tolerance to methanol and demonstrated durability towards the oxygen evolution reaction (OER) in alkaline media. In the course of the experiment, it was observed that the catalyst exhibited noteworthy activity in the Oxygen Evolution Reaction (OER) when compared to the commercially available RuO2 catalyst. This was evident through a more overpotential value of 325 mV at current density of 10 mA/cm2. The catalyst‘s notable capacity for high oxygen reaction activity may potentially enhance the synergistic effect resulting from the combination of defect sites and the porous structure of Fe3O4‐Carbon nanocomposites. The findings of this study indicate that the Fe3O4‐Carbon nanocomposites nanostructures exhibit promising attributes as an electrocatalyst for the oxygen evolution reaction (OER) in real‐world scenarios.

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Section: Resultsmentioning

confidence: 99%

Section: Synthesis Of Materialsmentioning

confidence: 99%

Section: Physical Characterizationsmentioning

confidence: 99%

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Fabrication of Highly Porous and Sheet Like Fe₃O₄‐Carbon Nanocomposites: A Versatile Catalyst for Electrocatalytic Oxygen Evolution Reactions

Shanmugapriya,

Kumar,

Afzal

et al. 2024

ChemistrySelect

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“…Furthermore, the XPS spectra of SA/NZVI-rGO before and after Cr(VI) removal demonstrated that Fe(0) was oxidized to Fe(II) and Fe(III), as well Cr(VI) was reduced to Cr(III) through obtaining electrons given by Fe(0), and Cr(III) reacts with OH − in an aqueous solution to form Cr(OH) 3 deposited on the gel beads. The presence of rGO led to a faster reduction of Cr(VI) to Cr(III) due to the formation of massive primary batteries by NZVI and rGO to accelerate the release of electrons [ 64 , 65 ]. Then, Fe(II), which is the result of the oxidation of Fe(0) losing electrons, can further reduce Cr(VI) to Cr(III), and Fe(II) was eventually oxidized to Fe(III).…”

Section: Resultsmentioning

confidence: 99%

Highly Stable, Mechanically Enhanced, and Easy-to-Collect Sodium Alginate/NZVI-rGO Gel Beads for Efficient Removal of Cr(VI)

Jing,

Ma,

et al. 2023

Polymers

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Nanoscale zero-valent iron (NZVI) is a material that is extensively applied for water pollution treatment, but its poor dispersibility, easy oxidation, and inconvenient collection limit its application. To overcome these drawbacks and limit secondary contamination of nanomaterials, we confine NZVI supported by reduced graphene oxide (rGO) in the scaffold of sodium alginate (SA) gel beads (SA/NZVI-rGO). Scanning electron microscopy showed that the NZVI was uniformly dispersed in the gel beads. Fourier transform infrared spectroscopy demonstrated that the hydrogen bonding and conjugation between SA and rGO allowed the NZVI-rGO to be successfully embedded in SA. Furthermore, the mechanical strength, swelling resistance, and Cr(VI) removal capacity of SA/NZVI-rGO were enhanced by optimizing the ratio of NZVI and rGO. Interestingly, cation exchange may drive Cr(VI) removal above 82% over a wide pH range. In the complex environment of actual Cr(VI) wastewater, Cr(VI) removal efficiency still reached 70.25%. Pseudo-first-order kinetics and Langmuir adsorption isotherm are preferred to explain the removal process. The mechanism of Cr(VI) removal by SA/NZVI-rGO is dominated by reduction and adsorption. The sustainable removal of Cr(VI) by packed columns could be well fitted by the Thomas, Adams–Bohart, and Yoon–Nelson models, and importantly, the gel beads maintained integrity during the prolonged removal. These results will contribute significant insights into the practical application of SA/NZVI-rGO beads for the Cr(VI) removal in aqueous environments.

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“…With the rapid development of global industrialization (electroplating processes, pigment industry, tanning of leather), illicit discharge of wastewater containing Cr(VI) ions has posed an increasing danger to people’s health [ 1 , 2 , 3 , 4 ]. Cr(VI) ions are liable to be absorbed through skin, digestive and mucous membranes, causing vomiting, dermatitis, eczema and abdominal pain [ 5 , 6 , 7 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

Orientation Growth of N-Doped and Iron-Based Metal–Organic Framework and Its Application for Removal of Cr(VI) in Wastewater

Chen,

Lei,

Zhao

et al. 2024

Molecules

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A series of NH2-functionalized nano-sized magnetic metal–organic frameworks (MOFs) were prepared in this study for Cr(VI) removal from wastewater. It was observed that not only the morphological, i.e., orientation growth of N-doped and iron-based metal–organic frameworks, but also the adsorption of magnetic MOFs is largely related to the used amount of ammonium hydroxide in preparation. For example, with increasing amounts of ammonium hydroxide used in preparation, the morphology of magnetic MOFs changed from spherical to cube and triangular cone. Moreover, the maximum adsorption capacity of spherical-magnetic MOFs, cubic-magnetic MOFs and triangular cone-magnetic MOFs could be up to 204.08 mg/g, 232.56 mg/g and 270.27 mg/g, respectively. Under optimal conditions, the adsorption process of magnetic MOFs for Cr(VI) was consistent with the pseudo-second-order rate equation (R2 = 1) and Langmuir isotherm model (R2 > 0.99). Therefore, magnetic MOFs developed in this work offered a viable option for the removal of Cr(VI) from wastewater.

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Bio-waste assisted phase transformation of Fe3O4/carbon to nZVI/graphene composites and its application in reductive elimination of Cr(VI) removal from aquifer

Cited by 12 publications

References 45 publications

Fabrication of Highly Porous and Sheet Like Fe₃O₄‐Carbon Nanocomposites: A Versatile Catalyst for Electrocatalytic Oxygen Evolution Reactions

Fabrication of Highly Porous and Sheet Like Fe₃O₄‐Carbon Nanocomposites: A Versatile Catalyst for Electrocatalytic Oxygen Evolution Reactions

Highly Stable, Mechanically Enhanced, and Easy-to-Collect Sodium Alginate/NZVI-rGO Gel Beads for Efficient Removal of Cr(VI)

Orientation Growth of N-Doped and Iron-Based Metal–Organic Framework and Its Application for Removal of Cr(VI) in Wastewater

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Bio-waste assisted phase transformation of Fe3O4/carbon to nZVI/graphene composites and its application in reductive elimination of Cr(VI) removal from aquifer

Cited by 12 publications

References 45 publications

Fabrication of Highly Porous and Sheet Like Fe3O4‐Carbon Nanocomposites: A Versatile Catalyst for Electrocatalytic Oxygen Evolution Reactions

Fabrication of Highly Porous and Sheet Like Fe3O4‐Carbon Nanocomposites: A Versatile Catalyst for Electrocatalytic Oxygen Evolution Reactions

Highly Stable, Mechanically Enhanced, and Easy-to-Collect Sodium Alginate/NZVI-rGO Gel Beads for Efficient Removal of Cr(VI)

Orientation Growth of N-Doped and Iron-Based Metal–Organic Framework and Its Application for Removal of Cr(VI) in Wastewater

Contact Info

Product

Resources

About

Fabrication of Highly Porous and Sheet Like Fe₃O₄‐Carbon Nanocomposites: A Versatile Catalyst for Electrocatalytic Oxygen Evolution Reactions

Fabrication of Highly Porous and Sheet Like Fe₃O₄‐Carbon Nanocomposites: A Versatile Catalyst for Electrocatalytic Oxygen Evolution Reactions