Hydrolytically stable citrate capped Fe3O4@UiO-66-NH2 MOF: A hetero-structure composite with enhanced activity towards Cr (VI) adsorption and photocatalytic H2 evolution

Tripathy, Suraj Prakash; Subudhi, Satyabrata; Das, Sukhen; Ghosh, Malay Kumar; Das, Mira; Acharya, R.; Acharya, Rashmi; Parida, Kulamani

doi:10.1016/j.jcis.2021.08.031

Cited by 126 publications

(51 citation statements)

References 52 publications

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“…Typically, the FT-IR analyses of UNH (Ce/Zr) are quite similar for all of the bimetallic (Ce/Zr) MOFs (1:1, 1:2, 2:1), suggesting a similar chemical bonding environment and identical functional groups in its framework, as well as representing no conspicuous variation in the peak position. These observed FT-IR results are in accordance with the previously reported results. , …”

Section: Resultssupporting

confidence: 93%

“…Following this complete framework, degradation took place, leading to conversion of both the samples into their underlying metal oxides, which can be seen by the insignificant mass change in the TGA plot. So, the pristine UNH(Zr) and UNH (Ce/Zr 1:1) have high thermal stabilities of approximately 330 °C, which is in accordance with the reported literature …”

Section: Resultssupporting

confidence: 91%

“…The BET adsorption/desorption curve of pristine UNH (Zr) and bimetallic UNH (Ce/Zr) has been presented in Figures d and S3, which resembles a Type-I isotherm showing the presence of framework microporosity . Moreover, the insertion of Ce ions into the UNH framework was accompanied by reduction in BET surface area, as shown in Table S2; however, the reduction in surface area does not affect the photocatalytic performance of the material due to the bimetallic synergistic effect. , Despite this, the bimetallic MOF’s isotherm pattern remained quite similar to that of the parent UNH (Zr) MOF, suggesting retention of the framework structure even with Ce ion insertion. The pore size of the prepared MOFs has also been provided in Table S2, which represents the microporosity in all of the prepared samples. , The detailed BJH pore volume plot has been provided in the insets of Figures d and S3.…”

Section: Resultsmentioning

confidence: 97%

“…These observed FT-IR results are in accordance with the previously reported results. 15,44 A high thermal stability is quite indispensable for any material's practical and scalable applicability. In our case, pristine UNH (Zr) and UNH (Ce/Zr 1:1) were explored towards thermal gravimetric analysis at an elevated temperature range that started from ambient temperature to 900 °C under N 2 or inert atmosphere, and the corresponding results are presented in Figure 1c.…”

Section: Resultsmentioning

confidence: 99%

“…So, the pristine UNH(Zr) and UNH (Ce/Zr 1:1) have high thermal stabilities of approximately 330 °C, which is in accordance with the reported literature. 44 The textural properties (surface area−BET and pore size distribution−BJH analysis) were determined for the prepared MOFs with the aid of the N 2 adsorption/desorption isotherm method. The BET adsorption/desorption curve of pristine UNH (Zr) and bimetallic UNH (Ce/Zr) has been presented in Figures 1d and S3, which resembles a Type-I isotherm showing the presence of framework microporosity.…”

Section: Resultsmentioning

confidence: 99%

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Mixed-Valence Bimetallic Ce/Zr MOF-Based Nanoarchitecture: A Visible-Light-Active Photocatalyst for Ciprofloxacin Degradation and Hydrogen Evolution

et al. 2022

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A mixed-valency bimetallic Ce/Zr MOF with Ce 3+ / Ce 4+ ions incorporated and an oxygen vacancy-rich singlecomponent photocatalyst have been designed through the onestep solvothermal route to harness photons from the visible-light spectrum for green energy (H 2 ) generation and ciprofloxacin (CIP) degradation. The one-pot-engineered bimetallic Ce/Zr MOF shows visible-light-active characteristics accompanied by a narrower band gap, along with enhanced exciton separation and superior ligand-to-metal charge transfer (LMCT), due to the presence of an interconvertible Ce 3+ /Ce 4+ ions pair in comparison to its pristine MOF counterpart. The Ce ion insertion led to increase in electron density around the Zr 4+ ion, along with generation of some oxygen vacancies (OV), which cumulatively led to the rise in the photo-reaction output. The synthesized UNH (Ce/Zr 1:1) MOF displayed a boosted photocatalytic H 2 production rate of 468.30 μmol h −1 (ACE = 3.51%), which is around fourfolds higher than that of pristine MOFs. Moreover, for CIP photodegradation, the UNH (Ce/Zr 1:1) shows an enhanced efficiency of 90.8% and follows pseudo-first-order kinetics with a rate constant of 0.0363. Typically, the active species involved in the photo-redox reaction of the CIP photodegradation follows the order hydroxyl radical (OH • ) < superoxide radical (O 2•− ), as confirmed by the TA and NBT tests. Consequently, the bimetallic Ce/Zr MOF can be readily employed as a robust photocatalyst with enhanced tendencies towards CIP degradation and H 2 evolution.

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Mixed-Valence Bimetallic Ce/Zr MOF-Based Nanoarchitecture: A Visible-Light-Active Photocatalyst for Ciprofloxacin Degradation and Hydrogen Evolution

et al. 2022

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Advancing High‐Performance Mixed Matrix Membrane via Magnetically Aligned Polycrystalline Co_0.5Ni_0.5FeCrO₄ Magnetic Spinel Nanoparticles for Effective H₂/CO₂ and O₂/N₂ Gas Separation

Ashtiani

Azadmanjiri

Hong

et al. 2022

Adv Materials Inter

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Gas separation matrix membranes (MMMs) benefit from a combination of a polymer matrix and heterogeneous solid or liquid (nano) additives. However, improvements in mechanical strength of membrane permeability or gas selectivity are often overbalanced by morphological deficiencies, such as aggregation or sedimentation of the nanofiller, due to poor control at the nano level. Here, the controlled orthogonal magnetic field deposition of self‐invented spinel Co0.5Ni0.5FeCrO4 magnetic nanoparticles (SMNPs) into the cellulose triacetate (CTA) results in well‐defined gas transport pathways in the membrane and enhances gas separation performances by expanding the effective‐selective surface area. Contrariwise, the structural observation of the fabricated MMMs in the absence of the magnetic field shows precipitation and aggregation of the particles at the bottom of the membrane. The permeability and selectivity of the H2/CO2 and O2/N2 gas pairs surpass the 2008 and 2015 Robeson upper bounds for the controlled embedding of the SMNPs series (up to 15 wt.%) while the neat CTA or MMM with a random non‐controlled SMNPs distribution exhibits substantially lower permeability and selectivity values. This work contributes to the development of magnetic field casting as a facile technique that advances the gas transport properties of MMMs, efficient for air separation.

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MOF Derived C/N Co‐Doped ZnO Modified through Facile In Situ Coupling with Ni_xP_y toward Photocatalytic H₂O₂ Production and H₂ Evolution Reaction

Ray

Subudhi

Tripathy

et al. 2022

Adv Materials Inter

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and electrochemical synthesis are also extensively employed for industrial H 2 O 2 production. However, due to the high processing cost, use of organic solvents, high energy input and emitting undesirable by products, an alternative method, i.e., photocatalysis process is widely approached by the research community. [4][5][6] Basically this method merely uses semiconductors, oxygen, water and solar light and is emerged as a cost effective, nonhazardous, and ecofriendly approach for H 2 O 2 production.In addition to it, a tenable alternative energy through photon-assisted hydrogen production reaction has become a crucial green energy source that functions as a powerful lever to avert the impending energy debacle. Consequently, a low-cost, ecofriendly and sustainable photocatalytic semiconductor capable of crossing the uphill kinetic and thermodynamic properties of some photocatalytic reactions has become an intense scientific interest. Among myriads of photocatalytic semiconducting materials, metal oxides, [7][8][9][10][11][12] exclusively ZnO has immense potentiality as being economical, biocompatibility, nontoxicity, inexpensive fabrication, photosensitivity, enviable band structure, and excellent chemical and physical stability with high excitation binding energy (60 mV). [13] In spite of photocatalytic desirability, pristine ZnO has some limitation due to broad bandgap (3.37 eV), makes it UV spectrum active photocatalyst which can only use less than 5% solar spectrum energy. [14] Thus, amidst numerous techniques, narrowing bandgap by doping non-metals is an effective way to extend absorption edge to the visible region of light irradiation (42% of solar energy), thereby enhancing the photocatalytic efficacy of ZnO. Pure ZnO can be doped with non-metals like; carbon and nitrogen through either in situ synthesis or post-treatment method. Nevertheless, in situ doping has the major advantage. [15,16] On the other hand, metal-organic frameworks (MOFs) are otherwise recognized as inorganic-organic hybrid materials have enticed great attention because of its functionality, tunable porosity, and high surface area. [17][18][19][20][21][22][23] Lately, MOFs are being used as template or precursor to develop carbonaceous porous materials, [24,25] N-doped carbonaceous materials [26,27] and C, N doped materials [15,16] etc., where carbon or both carbon and nitrogen containing ligands are used as source for C and N. Photocatalytic H 2 O 2 and H 2 evolution are the sustainable alternative to meet the energy crisis. To fabricate an efficacious photocatalyst, here a robust MOF-derived porous C/N co-doped ZnO nano-granular particles modified via in situ coupling with Ni x P y cocatalyst is developed. C and N are doped in ZnO via calcination of Zn-MOF that narrows the bandgap of ZnO as verified by UV-vis DRS. More in, Ni x P y acts as robust cocatalyst, which enhances light absorption ability in the visible region. The existence of C, N, and Ni-P components along with their tremendous charge carrier dynamics are confirmed from XP...

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Hydrolytically stable citrate capped Fe3O4@UiO-66-NH2 MOF: A hetero-structure composite with enhanced activity towards Cr (VI) adsorption and photocatalytic H2 evolution

Cited by 126 publications

References 52 publications

Mixed-Valence Bimetallic Ce/Zr MOF-Based Nanoarchitecture: A Visible-Light-Active Photocatalyst for Ciprofloxacin Degradation and Hydrogen Evolution

Mixed-Valence Bimetallic Ce/Zr MOF-Based Nanoarchitecture: A Visible-Light-Active Photocatalyst for Ciprofloxacin Degradation and Hydrogen Evolution

Advancing High‐Performance Mixed Matrix Membrane via Magnetically Aligned Polycrystalline Co_0.5Ni_0.5FeCrO₄ Magnetic Spinel Nanoparticles for Effective H₂/CO₂ and O₂/N₂ Gas Separation

MOF Derived C/N Co‐Doped ZnO Modified through Facile In Situ Coupling with Ni_xP_y toward Photocatalytic H₂O₂ Production and H₂ Evolution Reaction

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Hydrolytically stable citrate capped Fe3O4@UiO-66-NH2 MOF: A hetero-structure composite with enhanced activity towards Cr (VI) adsorption and photocatalytic H2 evolution

Cited by 126 publications

References 52 publications

Mixed-Valence Bimetallic Ce/Zr MOF-Based Nanoarchitecture: A Visible-Light-Active Photocatalyst for Ciprofloxacin Degradation and Hydrogen Evolution

Mixed-Valence Bimetallic Ce/Zr MOF-Based Nanoarchitecture: A Visible-Light-Active Photocatalyst for Ciprofloxacin Degradation and Hydrogen Evolution

Advancing High‐Performance Mixed Matrix Membrane via Magnetically Aligned Polycrystalline Co0.5Ni0.5FeCrO4 Magnetic Spinel Nanoparticles for Effective H2/CO2 and O2/N2 Gas Separation

MOF Derived C/N Co‐Doped ZnO Modified through Facile In Situ Coupling with NixPy toward Photocatalytic H2O2 Production and H2 Evolution Reaction

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Product

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About

Advancing High‐Performance Mixed Matrix Membrane via Magnetically Aligned Polycrystalline Co_0.5Ni_0.5FeCrO₄ Magnetic Spinel Nanoparticles for Effective H₂/CO₂ and O₂/N₂ Gas Separation

MOF Derived C/N Co‐Doped ZnO Modified through Facile In Situ Coupling with Ni_xP_y toward Photocatalytic H₂O₂ Production and H₂ Evolution Reaction