Synergy of the successive modification of cryptomelane MnO2 by potassium insertion and nitrogen doping for catalytic formaldehyde oxidation

Niu, Ming-Shuang; Yang, Heying; Yi, Xiaoyan; Zhou, Xiao Yan; Zhan, Jingjing; Liu, Yang

doi:10.1016/j.cej.2021.133928

Cited by 23 publications

(5 citation statements)

References 57 publications

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“…From mapping tests in Figures a–e and S2a, we can understand the distribution status of elements on MnO x -S-A, where Mn, O, Na, K, and S all exhibit a uniformly distributed state. It has been shown that small amount of alkali metal (Na + , K + ) doping can generate additional surface-adsorbed oxygen on the catalyst surface, while element S mainly exists on the catalyst surface in the form of SO 4 2– (as shown in Figure S2b), which may occupy some active sites of the catalyst. − As shown in Table S1, the elemental contents of Na, K, and S of MnO x -S-A after multiple deionized water rinses were 0.005, 0.222, and 0.575%, respectively, all of which were slightly lower than those of unrinsed MnO x -S-A. By testing the catalytic performance of MnO x -S-A without rinsing and with multiple rinses (shown in Figure S3), the performance of both was the same, indicating that the trace change in impurity content on the surface of the MnO x -S-A catalyst is not the main factor affecting its catalytic performance.…”

Section: Resultsmentioning

confidence: 99%

Formaldehyde Adsorption and Degradation at Room Temperature Boosted by Increasing the Specific Surface Area and Surface-Active Oxygen Content of Manganese Oxides

He,

Chen,

Deng

et al. 2024

Ind. Eng. Chem. Res.

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Preparation of manganese oxides with both excellent adsorption and catalytic activity for formaldehyde (HCHO) removal at room temperature remains challenging. In this work, the reaction between sodium thiosulfate and potassium permanganate was used to obtain MnO x -S with a mesoporous structure, which was subsequently treated with sulfuric acid to obtain MnO x -S-A. With MnO x -S-A, under static test conditions, approximately 1 ppm (volume concentration) of HCHO was completely removed from a 216 L closed vessel in 1.25 h, and 100% removal was still achieved in 2.5 h after 5 cycles. In the dynamic test condition of 150 L/(g cat h), MnO x -S-A consistently removed more than 95% of formaldehyde in 9 h. The excellent activity and stability of MnO x -S-A at room temperature can be attributed to its abundance of surface-active oxygen and its high specific surface area (273 m 2 /g). This work provides new ideas to further improve the adsorption and catalytic activity of manganese oxides.

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Section: Resultsmentioning

confidence: 99%

Formaldehyde Adsorption and Degradation at Room Temperature Boosted by Increasing the Specific Surface Area and Surface-Active Oxygen Content of Manganese Oxides

He,

Chen,

Deng

et al. 2024

Ind. Eng. Chem. Res.

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“…In the development of a heterogeneous Fenton reaction, the key problem is to develop high-activity nanocatalysts. MnO 2 , as a metal oxide, has been used widely as a nanocatalyst [12] due to its unique properties such as multiple valences of manganese, low toxicity, large surface area, primary adaptability, strong adsorption, and catalytic performance [13,14]. For example, Li et al prepared highly porous α-MnO 2 nanorods by selective acid etching from Mn-containing spinel, and 90.9% of 4-chlorophenol can be degraded within 12 min by catalytic ozonation in a wide range of pH of 4.5-10.5 [15].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Heterogeneous Fenton Catalysts Cu-Doped MnO2 for Enhanced Degradation of Dyes in Wastewater

Liu,

Wang,

et al. 2024

Nanomaterials

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Herein, a series of heterogeneous Fenton catalysts, Cu doped MnO2 (CDM), with different Cu/Mn molar ratios were prepared via a hydrothermal reaction. Meanwhile, detailed characterizations were used to study the structures of CDM, and it is amazing that the morphology of CDM changed from nanowires to nanoflowers with an increasing amount of Cu doped. Apart from this, both the specific surface area and oxygen vacancy increased obviously with the increasing Cu/Mn molar ratio. Then, the degradation of different dyes was utilized to evaluate the catalytic activity of different CDM with H2O2 used as the oxidizing agent, and the 50%-CDM with the highest content of Cu doped displayed the best catalytic activity. Herein, the degradation efficiency (D%) of Congo red (CR) solution with low concentration (60 mg/L) reached 100% in 3 min, while the D% of CR solution with a high concentration (300 mg/L) reached 99.4% after 5 min with a higher dosage of H2O2. Additionally, the 50%-CDM also displayed excellent reusability, for which the D% values were still higher than 90% after the 14th cycles. Based on the structure characteristics and mechanism analysis, the excellent catalytic capacity of 50%-CDM was due to the combined influence of large specific surface area and abundant oxygen vacancy. Thus, a promising heterogeneous Fenton catalyst was developed in this study, which proved the treatment efficiency of actual dye wastewater.

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“…[8][9][10][11][12][13] Manganese oxides have recently emerged as promising materials for diverse applications in pollution abatement. [14][15][16][17][18][19][20][21][22] However, it is still a great challenge to achieve high catalytic activity and long-term stability at ambient temperature for HCHO oxidation over MnO x -based catalysts.…”

Section: Introductionmentioning

confidence: 99%

Insights into the roles of superficial lattice oxygen in formaldehyde oxidation on birnessite

Ma,

Li,

Sun

et al. 2024

Nanoscale

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Synergy of the successive modification of cryptomelane MnO2 by potassium insertion and nitrogen doping for catalytic formaldehyde oxidation

Cited by 23 publications

References 57 publications

Formaldehyde Adsorption and Degradation at Room Temperature Boosted by Increasing the Specific Surface Area and Surface-Active Oxygen Content of Manganese Oxides

Formaldehyde Adsorption and Degradation at Room Temperature Boosted by Increasing the Specific Surface Area and Surface-Active Oxygen Content of Manganese Oxides

Preparation of Heterogeneous Fenton Catalysts Cu-Doped MnO2 for Enhanced Degradation of Dyes in Wastewater

Insights into the roles of superficial lattice oxygen in formaldehyde oxidation on birnessite

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