Fabrication of Zn-MOF/ZnO nanocomposites for room temperature H2S removal: Adsorption, regeneration, and mechanism

Gupta, Nishesh Kumar; Bae, Jiyeol; Kim, Suho; Kim, Kwang S.

doi:10.1016/j.chemosphere.2021.129789

Cited by 68 publications

(32 citation statements)

References 51 publications

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“…The HRXPS O 1s spectrum of MOF-199 fitted into three contributions at 531.5, 532.9, and 533.7 eV for Cu−O, C−O, and H 2 O, respectively (Figure S7a). 47 The HRXPS O 1s spectrum of MOF-199-A has similar contributions, with the binding energy shifting to a lower value for all three peaks. The binding energies of Cu−O and C−O peaks shifted to 531.1 and 531.8 eV, respectively (Figure S7b).…”

Section: ■ Results and Discussionmentioning

confidence: 94%

From MOF-199 Microrods to CuO Nanoparticles for Room-Temperature Desulfurization: Regeneration and Repurposing Spent Adsorbents as Sustainable Approaches

2021

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MOF-199 is one of the well-studied metal–organic frameworks (MOFs) for the capture of small gas molecules. In this study, we have investigated the thermal transformation of MOF-199 microrods to CuO nanoparticles by various microscopic and spectroscopic techniques. The growth of oxide was initiated by the formation of ∼2.5 nm particles at 200 °C, which ended up as CuO nanoparticles of ∼100–250 nm size at 550 °C. An intermediate presence of Cu2O along with CuO was recorded at 280 °C. The MOF and calcined products were tested for the room-temperature desulfurization process. MOF-199 showed the maximum adsorption capacity for H2S gas (77.1 mg g–1) among all adsorbents studied. Also, MOF-199 showed a better regeneration efficiency than the derived oxide. For a sustainable process, the exhausted adsorbents were used for the photocatalytic degradation of methylene blue. The exhausted materials showed better degradation efficiencies than the fresh materials. This study reports new sustainable approaches for MOF-199 application in air and water decontamination.

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Section: ■ Results and Discussionmentioning

confidence: 94%

From MOF-199 Microrods to CuO Nanoparticles for Room-Temperature Desulfurization: Regeneration and Repurposing Spent Adsorbents as Sustainable Approaches

2021

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“…Though metal oxide formation was not reported in case of Cu-based MOFs synthesized using the same process, 28 a higher metal-to-ligand ratio for zinc-based MOFs resulted in the formation of ZnO in MOFs. 29 The deviation from a conventional metal-to-H 3 BTC ratio of 3 : 2 in the present study (with 1 : 1 ratio) led to either no deposition or significantly low deposition of metal oxides as compared to those with H 2 BDC linkers.…”

Section: Resultsmentioning

confidence: 48%

Terephthalate and trimesate metal–organic frameworks of Mn, Co, and Ni: exploring photostability by spectroscopy

et al. 2021

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“…In general, the presence of moisture plays a positive role in the H 2 S adsorption process by dissociating H 2 S molecules in the water film 37 , 47 . The adsorption capacity could decrease due to the competitive behaviour of water molecules for the adsorption sites 48 . Moreover, the formation of sulfuric acid could lower the structural integrity of the adsorbent and decrease its adsorption capacity.…”

Section: Resultsmentioning

confidence: 99%

Metal organic framework derived NaCoxOy for room temperature hydrogen sulfide removal

Gupta

Bae

Kim

2021

Sci Rep

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Novel NaCoxOy adsorbents were fabricated by air calcination of (Na,Co)-organic frameworks at 700 °C. The NaCoxOy crystallized as hexagonal microsheets of 100–200 nm thickness with the presence of some polyhedral nanocrystals. The surface area was in the range of 1.15–1.90 m2 g−1. X-ray photoelectron spectroscopy (XPS) analysis confirmed Co2+ and Co3+ sites in MOFs, which were preserved in NaCoxOy. The synthesized adsorbents were studied for room-temperature H2S removal in both dry and moist conditions. NaCoxOy adsorbents were found ~ 80 times better than the MOF precursors. The maximum adsorption capacity of 168.2 mg g−1 was recorded for a 500 ppm H2S concentration flowing at a rate of 0.1 L min−1. The adsorption capacity decreased in the moist condition due to the competitive nature of water molecules for the H2S-binding sites. The PXRD analysis predicted Co3S4, CoSO4, Co3O4, and Co(OH)2 in the H2S-exposed sample. The XPS analysis confirmed the formation of sulfide, sulfur, and sulfate as the products of H2S oxidation at room temperature. The work reported here is the first study on the use of NaCoxOy type materials for H2S remediation.

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Fabrication of Zn-MOF/ZnO nanocomposites for room temperature H2S removal: Adsorption, regeneration, and mechanism

Cited by 68 publications

References 51 publications

From MOF-199 Microrods to CuO Nanoparticles for Room-Temperature Desulfurization: Regeneration and Repurposing Spent Adsorbents as Sustainable Approaches

From MOF-199 Microrods to CuO Nanoparticles for Room-Temperature Desulfurization: Regeneration and Repurposing Spent Adsorbents as Sustainable Approaches

Terephthalate and trimesate metal–organic frameworks of Mn, Co, and Ni: exploring photostability by spectroscopy

Metal organic framework derived NaCoxOy for room temperature hydrogen sulfide removal

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