Chemisorption of hydrogen sulfide over copper-based metal–organic frameworks: methanol and UV-assisted regeneration

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

doi:10.1039/d0ra09017d

Cited by 59 publications

(60 citation statements)

References 39 publications

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“…The band at 1502 cm −1 was for C=C stretchings of the aromatic skeleton. The mid-intensity bands at 825, 808, and 753 cm −1 were attributed to the C–H bending modes 37 , 38 . The band at 457 and 510 cm −1 were due to the Co–O stretching 39 .…”

Section: Resultsmentioning

confidence: 99%

“…In the moist condition, the adsorption capacity of MOFs and derived oxides decreased. 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 .…”

Section: Resultsmentioning

confidence: 99%

“…The peaks at 168.1 and 169.2 eV were assigned to the S 2p 3/2 and S 2p 1/2 of sulfate ions, respectively. These sulfate ions were considered as CoSO 4 , observed in the PXRD pattern as well 18 , 37 . Thus, all three major sulfur species were conclusively detected in the XPS analysis.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Metal organic framework derived NaCoxOy for room temperature hydrogen sulfide removal

Gupta

Bae

Kim

2021

Sci Rep

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“…Motivated by these findings, we also studied the regeneration of the Cu-DPA MOF after adsorption experiment. Herein a methanol solution followed by irradiation of the sample with low power UV was used to regenerate the used Cu-DPA MOF (Gupta et al, 2021). We first submerged and stirred the used MOF in 10 ml of methanol for 24 h at 500 rpm, followed by centrifugation and drying at ambient temperature for 24 h. Then, the dried MOF was illuminated with a low power UV lamp using a Pyrex tube fitted in an acryl reactor.…”

Section: Adsorption Experiments For Real Samplementioning

confidence: 99%

High Performance Copper Based Metal Organic Framework for Removal of Heavy Metals From Wastewater

et al. 2022

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The biggest challenge of this century is the generation of wastewater which is released to the environment due to industrial expansion. Industrial development has caused the release of various pollutants including heavy metals such as Cd, Pb, and Cr into the environment. In this study, copper diphenylamine metal-organic framework (Cu-DPA MOF) has been synthesized via hydrothermal method and its adsorption capacity toward the removal of heavy metals from wastewater was examined. The removal efficiency of heavy metals by Cu-DPA MOF was tested at optimized adsorption parameters such as optimal adsorbent dosage, pH, initial metals concentration, and adsorption time. The heavy metals concentration in the wastewater before treated with the as-synthesized MOF was determined to be 0.3027, 0.0098, and 0.1021 mg/L for Cr, Cd, and Pb, respectively. The corresponding concentrations of heavy metals in wastewater were reduced to 0.0015, 0.00024, and 0.00016 mg/L when treated with the as-synthesized MOF. As a result, a maximum removal efficiency of 97.6%, 99.5%, and 99.5% was achieved for Cd, Cr, and Pb metals, respectively. This is possibly due to the high porous nature and huge surface area of the as-synthesized MOF. The adsorption data were best fitted with Freundlich isotherm throughout this study. The study sheds light on the design of adsorbents with high removal efficiency of pollutants found in the environment.

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“…The secondary reaction was the dehydration of metal hydroxides to form metal oxide nanoparticles under ultrasonication. 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: 93%

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

et al. 2021

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Chemisorption of hydrogen sulfide over copper-based metal–organic frameworks: methanol and UV-assisted regeneration

Abstract: H2S adsorption and regeneration of Cu-based MOFs.

Cited by 59 publications

References 39 publications

Metal organic framework derived NaCoxOy for room temperature hydrogen sulfide removal

Metal organic framework derived NaCoxOy for room temperature hydrogen sulfide removal

High Performance Copper Based Metal Organic Framework for Removal of Heavy Metals From Wastewater

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

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