Chromium-doped cryptomelane: Mn-O debilitation and reactive enhancement in formaldehyde abatement

Tran-Thuy, Tuyet-Mai; Le, Thi-Phuong; Tran, Trong-Phu; Lam, Hoa-Hung; Nguyen, Long; Nguyen, Dung Van; Dang‐Bao, Trung

doi:10.1016/j.matlet.2021.130777

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…This consisted with increase of chromium loading resulting an incline of Mn-AOS over Cr-doped cryptomelane. This also figured out that chromium dopant took part in weakening the Mn-O bonds leading a positive effect on enhancement of formaldehyde-total oxidation [Tran-Thuy et al, 2021].…”

Section: Characterizations Of Catalystsmentioning

confidence: 65%

“…After that, the brown slurry was washed many times with distilled water, filtered and dried over night at 120 C. For a comparison, an un-doped cryptomelane (K-OMS-2, K0) was prepared following the protocol reported in our previous work [Tran-Thuy et al, 2021].…”

Section: Preparation Of K-oms-2 and Ni-ce-oms-2 Materialsmentioning

confidence: 99%

“…The chemical composition was determined by the inductively coupled-plasma mass spectrometry (ICP-MS, OptimaTM 8000 ICP-OES). The manganese average oxidation state (Mn-AOS) was determined by titration method [Tran-Thuy et al, 2021].…”

Section: Materials Characterization Analysismentioning

confidence: 99%

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Ni-Ce-OMS-2 material: preparation and preliminary catalytic-study on removing ethanol in the gas phase

2023

Global NEST: The International Journal

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<p>Cryptomelane type manganese oxide K-OMS-2 and Ni-Ce-OMS-2 co-doping materials were synthesized by one-step preparation with refluxing system. The crystalline structure, and morphology were characterized by X-ray diffraction analysis and SEM images. Ni (II) and Ce (III) were incorporated into cryptomelane, substituted for Mn (III) and Mn (IV) resulting an increase of Mn-average-oxidation-state from 3.6 to 3.8 for un-doped and co-doped samples, respectively. With different amount of precursor-cerium concentration, NiCe1.0 improved the ethanol conversion by a factor of 8 compared to unmodified K-OMS-2. Additionally, NiCe1.0 showed a significant increase of ethanol conversion with reaction temperature. Over above 90% of ethanol was total oxidized at 150 C suggesting a potential Ni-Ce-OMS-2 catalyst for removing volatile organic compounds at low temperature.</p>

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Section: Characterizations Of Catalystsmentioning

confidence: 65%

Section: Preparation Of K-oms-2 and Ni-ce-oms-2 Materialsmentioning

confidence: 99%

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Ni-Ce-OMS-2 material: preparation and preliminary catalytic-study on removing ethanol in the gas phase

2023

Global NEST: The International Journal

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“…Nanocomposite material based on mesoporous silica showed maximum adsorption capacity was ~180 mgHg(II)/g [12]. The cryptomelane structure, a well-known crystal of octahedral molecular sieve, was reported as an effective adsorbent for removal of heavy metal ions [13][14][15][16]. In this study, we utilized the cryptomelane materials prepared by the simple sol-gel method to study Hg(II) adsorption.…”

Section: Introductionmentioning

confidence: 99%

Octahedral Molecular Sieve Manganese Oxide: Feasible Material for Hg(II) Remediation

Thuy

Nguyen

2023

Advanced Materials Science: Selected Articles From ICoAMS 2022

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Manganese-oxide material prepared by simple sol-gel method was used as an adsorbent of Hg(II) in aqueous solution. X-ray diffraction pattern and Raman spectroscopy were conducted to prove the cryptomelane crystal. The Hg(II) adsorption behavior of the synthesized material well obeyed kinetic models of pseudo-second-order and Elovich equations indicating a chemisorption from the collected kinetic parameters. 500 mgHg2+/gcryptomelane of equilibrium uptake capacity from pseudo-second-order and 7.87x103 mgHg2+/gcryptomelane/day of initial adsorption rate from the Elovich model were obtained for adsorption of Hg2+ cation over cryptomelane adsorbent. Desorption constant of 0.018 gcryptomelane/mgHg is a significant small value, in comparison to initial adsorption rate, proposing a possible chemisorption for remediation of Hg(II) on cryptomelane structure.

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Cobalt-Doped Cryptomelane: Surface-Tailored Oxygen Defects and Efficiently Catalytic Ozonation of p-Nitrophenol

2022

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Chromium-doped cryptomelane: Mn-O debilitation and reactive enhancement in formaldehyde abatement

Cited by 6 publications

References 7 publications

Ni-Ce-OMS-2 material: preparation and preliminary catalytic-study on removing ethanol in the gas phase

Ni-Ce-OMS-2 material: preparation and preliminary catalytic-study on removing ethanol in the gas phase

Octahedral Molecular Sieve Manganese Oxide: Feasible Material for Hg(II) Remediation

Cobalt-Doped Cryptomelane: Surface-Tailored Oxygen Defects and Efficiently Catalytic Ozonation of p-Nitrophenol

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