Mechanistic Insights into the Phase Formation of an Atypical Iron Oxynitride (FexOyNz) System and Its Multifunctional Photocatalytic Applications

Ravikumar, Mithun Prakash; Quach, Toan-Anh; Urupalli, Bharagav; Manjunatha, Krishtappa; Murikinati, Mamatha Kumari; Venkatakrishnan, Shankar Muthukonda; Wu, Sheng Yun; Do, Trong-On; Mohan, Sakar

doi:10.1021/acssuschemeng.3c04497

Cited by 6 publications

(1 citation statement)

References 75 publications

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“…The photographic images of the dye-adsorbed MOF membranes before and after photocatalytic degradation are displayed in Figure c,d. It can be noticed that the degradation of dyes can be clearly seen on the surface of the membranes. , While the conventional membranes can only separate pollutants, these photocatalytic membranes can both effectively separate and degrade the pollutants on the membrane surfaces. In this way, these photocatalytic membranes can be innovative, which greatly reduces the cost involved in the safe disposal of pollutants after their separation from water.…”

Section: Resultsmentioning

confidence: 99%

Synergy of Ligands in Tailoring the Photocatalytic Properties of Zirconium Metal–Organic Framework-Impregnated Membranes for Water Treatment

Karthik,

Vinothkumar,

Mohan

et al. 2024

Ind. Eng. Chem. Res.

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The Zr-based metal−organic framework (MOF) nanoparticles by varying three different ligands (2-methylimidazole, 2-aminoterephthalic acid, and terephthalic acid) are synthesized using a solvothermal method and impregnated into polysulfone membranes. These MOF membranes served as photocatalytic membranes and facilitated both the separation and degradation of dyes in water. Both the XRD and IR analysis revealed that the MOFs are well interacting with the membrane matrix, manifesting effective hydrophilic and surface potential properties confirmed by contact angle, water uptake, and zeta potential analyses. The FESEM images revealed that the MOFs are exposed on the surface, supporting the enhanced dye separation and photocatalytic properties. Further, the cross-sectional images showed that the pore channels in MOF membranes are block-free, smooth, and uniform. These features facilitated the enhanced flux and antifouling properties of MOF membranes compared to bare ones. As a result, the optimized MOF membrane (i.e., amine functionalized Zr-MOF-impregnated membrane) showed an enhanced water flux of around 57 L/m 2 h, while it is ∼25 L/m 2 h in the case of the bare membrane. The dye (rhodamine B and Congo red) rejection efficacy values of this MOF membrane are around 81.6 and 75.8%, respectively, which are around 2-fold higher than the bare one. Similarly, the RhB/CR dye solution flux of the MOF membrane is around 39.6/33.3%, respectively, while it is only around 10.2/10.4% in the case of the bare membrane. These MOF membranes also showed enhanced fouling resistance compared to bare ones, estimated through reversible and irreversible fouling estimations. Furthermore, the photocatalytic efficiency of the MOF membrane is appreciable, which degraded around 10.7/8.2% of RhB/CR dye, respectively. These add-on features induced by MOFs can considerably reduce the overall process cost of the membrane separation and, especially, the cost involving not only the regeneration and self-cleaning of the membranes but also the safe disposal of the dyes separated on the membrane surface.

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Section: Resultsmentioning

confidence: 99%

Synergy of Ligands in Tailoring the Photocatalytic Properties of Zirconium Metal–Organic Framework-Impregnated Membranes for Water Treatment

Karthik,

Vinothkumar,

Mohan

et al. 2024

Ind. Eng. Chem. Res.

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Oxynitride from Oxide versus Nitride: Manifesting Competitive and Synergistic Properties in Titanium Oxynitride for Solar‐Driven Water Splitting and Nitrogen Fixation

Ravikumar,

Quach,

Urupalli

et al. 2024

Solar RRL

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The present study investigates the phase formation of the titanium oxynitride (TiOxNy) system by employing the ‘oxide‐to‐oxynitride’ and ‘nitride‐to‐oxynitride’ synthesis strategies. The XRD patterns of both the materials showed peaks corresponding to Ti‐N and Ti‐O lattices, confirming the formation of Ti‐oxynitride system. Accordingly, the presence of Ti3+‐N3‐ and Ti4+‐2O2‐ signals is also confirmed by XPS analysis. The TiOxNy derived from oxide (TO‐TON) exhibits wide visible light absorption with a narrow band gap energy of ∽2.30 eV, while the nitride‐derived‐TiOxNy (TN‐TON) exhibits relatively a wide band gap energy (∽2.92 eV) along with the plasmonic band of TiN. In line with this, an enhanced recombination resistance and charge carriers with extended lifetime is observed for TN‐TON (4.47 ns) and TO‐TON (4.33 ns) systems via PL and TRPL analysis. Consequently, the TN‐TON system demonstrated a superior H2/NH3 production at a rate of ∽1432/646 µmol g‐1 h‐1 under solar irradiation, while it is ∽1136/553 µmol g‐1 h‐1 for the TO‐TON system. These efficiencies are ∽20x and 3x times higher than the bare TiN and TiO2, respectively towards H2/NH3 production. The insights from this study demonstrate that the nitride and oxide‐based precursors likely manifest synergistic and competitive properties, respectively, in the resulting oxynitride system.This article is protected by copyright. All rights reserved.

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Unveiling the potential of alloyed core/double shell InZnP/ZnSe/ZnS quantum dots: High quantum efficiency and stable water splitting performance

Lee,

Kim,

Urupalli

et al. 2024

Applied Catalysis O: Open

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Mechanistic Insights into the Phase Formation of an Atypical Iron Oxynitride (Fe_xO_yN_z) System and Its Multifunctional Photocatalytic Applications

Cited by 6 publications

References 75 publications

Synergy of Ligands in Tailoring the Photocatalytic Properties of Zirconium Metal–Organic Framework-Impregnated Membranes for Water Treatment

Synergy of Ligands in Tailoring the Photocatalytic Properties of Zirconium Metal–Organic Framework-Impregnated Membranes for Water Treatment

Oxynitride from Oxide versus Nitride: Manifesting Competitive and Synergistic Properties in Titanium Oxynitride for Solar‐Driven Water Splitting and Nitrogen Fixation

Unveiling the potential of alloyed core/double shell InZnP/ZnSe/ZnS quantum dots: High quantum efficiency and stable water splitting performance

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