The Cu-doped cryptomelane-type octahedral molecular sieve manganese oxide synthesized by sol-gel for the degradation of methylene blue

Awaluddin, Amir; Astuti, Lia; Linggawati, Amilia; Siregar, Siti Saidah; Prasetya, Prasetya; Saputra, Leo

doi:10.1063/1.5065035

Cited by 14 publications

(3 citation statements)

References 15 publications

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“…The degradation time also showed that within 1 minute, it was able to reduce Methylene Blue levels up to 89.18% and continue to increase until 30 minutes reaching 97.63 %. There was an increase in the effectiveness of catalysis for MB degradation compared to cryptomelane doped with Fe (54.82 -77.82 %) [16], cryptomelane doped with Cu (57.82 -94.64 %) [17], and birnessite (78.89 -97.73 %) [18].…”

Section: Characteristic Of Function Groupsmentioning

confidence: 99%

Manganese Oxide Synthesis of Birnessite Type Using Sol-Gel Method for Methylene Blue Degradation

Prasetya¹,

Putri²,

Yuhelson³

et al. 2019

Proceedings of the International Conference of CELSciTech 2019 - Science and Technology Track (ICCELST-ST 2019)

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The need for catalysts for effective and environmentally friendly waste degradation is increasing. Manganese oxide has a layered structure which is theoretically capable of producing catalysis properties. The synthesis was done through variation of mole ratio of precursors and time of washing. The variations ratio of moles of precursors and washing determined the type of manganese oxide. Synthesis of birnessite type manganese oxide has been successfully performed using KMnO 4 and citric acid precursors via sol-gel method. The optimum condition of birnessite synthesis through sol-gel method was obtained in a precursor mole ratio of KMnO 4 and citric acid 3:1, single washing, with a time of calcination for 5 hours, and calcination temperature of 500 °C. The results showed that the ratio of K/Mn atoms were 3.1 to 8.0. Interpretation of infrared absorption shows a typical vibration of birnessite. Birnessite produced has a formula which was KMn 3 O 11. Birnessite can eliminate Methylene Blue up to 97.63%.

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Section: Characteristic Of Function Groupsmentioning

confidence: 99%

Manganese Oxide Synthesis of Birnessite Type Using Sol-Gel Method for Methylene Blue Degradation

Prasetya¹,

Putri²,

Yuhelson³

et al. 2019

Proceedings of the International Conference of CELSciTech 2019 - Science and Technology Track (ICCELST-ST 2019)

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“…The tunnel or layer structures occur depending upon the arrangement of MnO6 octahedral units, which result in the formation of 1x1, 2x1, 2x2, and 3x3 tunnels [2,3]. Many manganese oxides have been succesfully synthesized by various synthetic method, such as sol-gel [4][5][6][7], solid-state [3], precipitation [8][9][10][11], reflux [12] and hydrothermal [13]. Manganese oxides exist in nature as mixed valences Mn (Mn 2+ /Mn 3+ /Mn 4+ ) that could facilitate redox reaction.…”

Section: Introductionmentioning

confidence: 99%

The Catalytic Activity Of Manganosite MnO/Activated Carbon For Photo-Degradation Of Synthetic Dye

Awaluddin,

Amiruddin,

Siregar

et al. 2024

E3S Web Conf.

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Photocatalytic degradation of organic dye such as methylene blue (MB) has been on focused various research interest due to environmental impact. In this study, the composite manganosite MnO/activated carbon was synthesized by a facile one-pot of solgel method through the reaction between potassium permanganate, glucose and commercial activated carbon. The XRD result revealed the presence of rock-salt manganosite MnO in the composite. The catalytic studies were performed under different solution pH, different catalyst concentration and various initial MB concentrations. The result indicated that the catalyst is very effective for the degradation of MB at the basic condition (pH 9 and p11). The degradation of MB in an acidic environment, however, is much less than that of basic condition. In addition, an increase in initial MB concentration caused a decrease in MB degradation due to the saturation of the active sites of the catalyst. The maximum degradation of MB was 98.86 % achieved at pH 11, the initial MB concentration of 50 ppm, and the catalyst concentration of 35 mg.

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“…Among manganese oxides, birnessite and cryptomelane are often the subjects of intense research due to their high catalytic activity in numerous reactions [21][22][23][24][25][26][27]. The high reactivity of both phases can be assigned to a combination of several features, such as beneficial porous structure, redox properties due to the mixed valence framework, and high oxygen mobility [22,[28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Thermal Transformation of Birnessite (OL) Towards Highly Active Cryptomelane (OMS-2) Catalyst for Soot Oxidation

et al. 2019

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A layered potassium-manganese oxide, birnessite (OL: KMn 4 O 8) was subjected to long-term post-calcination thermal treatment aimed at stimulating its activity in catalytic soot oxidation. The 12 h thermal treatment at several temperatures (425, 500, 550 and 650 °C) in atmospheric conditions resulted in the swift transformation of the layered material into the tunnel-shaped octahedral molecular sieve cryptomelane (OMS-2: KMn 8 O 16). The obtained materials were thoroughly characterized using powder X-ray diffraction, Raman spectroscopy, N 2-BET specific surface area analysis, and transmission electron microscopy techniques. With increasing temperature of thermal treatment, the concentration of OMS-2 increased, which was confirmed by Rietveld analysis, and dominated the material properties, notably the lowering of work function of the catalysts (Δϕ = 0.2 and 0.4 eV in air and vacuum, respectively). The obtained results reveal the high catalytic activity of the OMS-2 formed from the thermal transformation of the OL material compared to both the parent OL material and the uncatalyzed soot oxidation reaction. The achieved catalytic activity showed direct correlation with the temperature of pretreatment, with the most active catalyst being calcined at 550 °C/12 h, and lowering the temperature of 50% soot conversion (T 50%) by spectacular 150 °C in loose contact. The catalytic activities were found to correlate well with the work function (low work function-high catalytic activity), confirming the electron transfer from the catalyst surface to oxygen molecule as the important step in the soot oxidation mechanism over mixed potassium-manganese oxides. The beneficial effect of thermal pre-treatment was found to last over multiple runs, maintaining a T 50% lower by 100 °C compared to the untreated parent material. The obtained results indicate the importance of the temperature treatment for the catalytic performance of potassium promoted transition metal oxides as catalytically active phases for efficient soot removal in the conditions present in combustion engine exhaust gases.

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The Cu-doped cryptomelane-type octahedral molecular sieve manganese oxide synthesized by sol-gel for the degradation of methylene blue

Cited by 14 publications

References 15 publications

Manganese Oxide Synthesis of Birnessite Type Using Sol-Gel Method for Methylene Blue Degradation

Manganese Oxide Synthesis of Birnessite Type Using Sol-Gel Method for Methylene Blue Degradation

The Catalytic Activity Of Manganosite MnO/Activated Carbon For Photo-Degradation Of Synthetic Dye

Thermal Transformation of Birnessite (OL) Towards Highly Active Cryptomelane (OMS-2) Catalyst for Soot Oxidation

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