Effect of K+ ions on efficient room-temperature degradation of formaldehyde over MnO2 catalysts

Fang, Ruimei; Feng, Qiuyu; Huang, Haibao; Ji, Jian; Miao, He; Zhan, Yanhui; Liu, Biyuan; Leung, Dennis Y.C.

doi:10.1016/j.cattod.2018.05.019

Cited by 64 publications

(23 citation statements)

References 44 publications

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“…Removing formaldehyde using H 2 O 2 produced in situ is a promising method that can reduce the danger and costs of the storage and transportation of H 2 O 2 . [10] Therefore, we investigated the degradation effect of H 2 O 2 generated in situ in a flow-cell device via a two-electrode method (Figure 7a). Figure 7b indicates the removal efficiency of formaldehyde (initial concentration of 14.0 mg/L) at different cell potentials for 60 min.…”

Section: Resultsmentioning

confidence: 99%

“…[9] Formaldehyde is very harmful to the environment and human health, and treating industrial wastewater containing formaldehyde is therefore of great importance. [10] The removal of formaldehyde in an alkaline solution using H 2 O 2 is a promising method. However, the danger and costs of the storage and transportation of H 2 O 2 may be very high.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electrocatalyst Derived from Abundant Biomass and its Excellent Activity for In Situ H₂O₂Production

Liao

Wang

et al. 2019

ChemElectroChem

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Hydrogen peroxide (H2O2) is considered an essential chemical and is widely used in many fields. The in situ electrochemical production of H2O2 using oxygen reduction has become promising in H2O2 applications because it can reduce the danger and costs of the storage and transportation of H2O2. Developing high‐performance and metal‐free electrocatalysts with cheap and commercially available source materials for in situ H2O2 production remains challenging. Here, the N, O‐co‐doped microporous carbons derived from abundant biomass (bean dregs) were prepared by a simple hydrothermal treatment and annealing process. Electrochemical measurement results showed a high selectivity (up to 98 %) of the typical product in 0.1 M KOH, a satisfactory disk current density and a high productivity of H2O2 (380 mg L−1 h−1) with an excellent faradaic efficiency (up to 97.0 %), which were achieved through RRDE technology and flow cell. Additionally, the system equipped with a (GDE, containing N‐O‐MC‐750) as the cathode exhibited high performance in removing formaldehyde, and it may have potential application in the treatment of wastewater containing formaldehyde. This method can avoid the danger and costs of the storage and transportation of H2O2. This work is helpful for developing a high‐performance electrocatalyst for the production of H2O2, and for its practical application.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrocatalyst Derived from Abundant Biomass and its Excellent Activity for In Situ H₂O₂Production

Liao

Wang

et al. 2019

ChemElectroChem

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“…Surface defective oxides and hydroxyl groups were reported to take part in the formation of formates intermediates and further oxidation of surface carbonates into CO2. 7,51 On the other hand, it is interesting to observe that the carbonates peak (1653 cm -1 ) on 0.05Cu δ-MnO2 nearly became the dominant peak, thereby indicating the surface accumulation of carbonates with time. Furthermore, additional weak feature appeared at around 840 cm -1 on 0.05Cu δ-MnO2, which is attributed to carbonate species.…”

Section: Reaction Mechanismmentioning

confidence: 98%

“…35,48,50 The bands observed at 2730-2732, 1440-1453, and 1127-1161 cm -1 are characteristic features of dioxymethylene (DOM) species. 6,11,48 Features attributed to bidentate carbonates (1653, 1240, and 1015-1053 cm -1 ) and monodentate carbonates (1470-1490, 1315-1331 cm 1 ) were also observed, 7,25,[51][52][53] while the bands at around 1620 cm -1 correspond to the bending vibration of adsorbed water molecules. [54][55] In the presence of Co, the DOM species (1161 cm -1 ) are quickly converted to formates intermediates, and exhibited the highest production rate of formates (1567 cm -1 ).…”

Section: Reaction Mechanismmentioning

confidence: 99%

Opposite Effects of Co and Cu Dopants on the Catalytic Activities of Birnessite MnO₂ Catalyst for Low-Temperature Formaldehyde Oxidation

et al. 2020

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Defect engineering is an effective strategy to enhance the activity of catalysts for various applications. Herein, it was demonstrated that in addition to enhancing surface properties via doping, the influence of dopants on the surface–intermediate interaction is a critical parameter that impacts the catalytic activity of doped catalysts for low-temperature formaldehyde (HCHO) oxidation. The incorporation of Co into the lattice structure of δ-MnO2 led to the generation of oxygen vacancies, which promoted the formation of surface active oxygen species, reduced activation energy, and enhanced catalytic activity for low-temperature oxidation of HCHO. On the contrary, Cu doping led to a drastic suppression of the catalytic activity of δ-MnO2, despite its enhanced redox properties and slight increase in the surface concentration of active oxygen species, compared to pristine δ-MnO2. Diffuse reflectance infrared Fourier transform analysis revealed that in the presence of Cu, carbonate intermediate species accumulate on the surface of the catalysts, leading to partial blockage of active sites and suppression of catalytic activity.

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“…Among these methods, catalytic oxidation of HCHO into CO 2 and H 2 O is recognized as the most promising method owing to its high HCHO removal efficiency, lack of toxic byproduct and secondary pollution, and no extra energy consumption. 14,15 A variety of catalysts such as supported noble metals [16][17][18][19][20] and transition metal oxides [21][22][23][24] have been utilized for HCHO oxidation at room temperature. Although supported noble metal catalysts have shown remarkable catalytic activities at room temperature, the high cost hinders their wide application.…”

Section: Introductionmentioning

confidence: 99%

Facile preparation, characterization, and formaldehyde elimination performance of MnO_x/natural loofah composites

Feng

Zhang

et al. 2020

Env Prog and Sustain Energy

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MnO x /natural loofah composites were first prepared by a facile in-situ reduction process under ambient conditions, in which natural loofah was impregnated in potassium permanganate solution for different time. MnO x nanoparticles were loaded on both exterior and interior of the fibrous strands of loofah after impregnation from SEM observations. The crystal structure and chemical properties of MnO x in the composites were confirmed to birnessite-type MnO x with the interplanar spacing of 0.24 nm and Mn oxidation state of 3.6 by XRD, Raman, FTIR, TEM, and XPS. Such produced MO x /loofah composites showed excellent performance for the catalytic oxidative decomposition and adsorption of formaldehyde at room temperature. The composites prepared with longer impregnation time exhibited better catalytic performance. The decomposition mechanism of HCHO over the MO x /loofah composites involved adsorbed HCHO on the loofah was oxidized into intermediates first and further CO 2 by MnO x through in-situ DRIFTS analysis.

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Effect of K+ ions on efficient room-temperature degradation of formaldehyde over MnO2 catalysts

Cited by 64 publications

References 44 publications

Electrocatalyst Derived from Abundant Biomass and its Excellent Activity for In Situ H₂O₂Production

Electrocatalyst Derived from Abundant Biomass and its Excellent Activity for In Situ H₂O₂Production

Opposite Effects of Co and Cu Dopants on the Catalytic Activities of Birnessite MnO₂ Catalyst for Low-Temperature Formaldehyde Oxidation

Facile preparation, characterization, and formaldehyde elimination performance of MnO_x/natural loofah composites

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Effect of K+ ions on efficient room-temperature degradation of formaldehyde over MnO2 catalysts

Cited by 64 publications

References 44 publications

Electrocatalyst Derived from Abundant Biomass and its Excellent Activity for In Situ H2O2Production

Electrocatalyst Derived from Abundant Biomass and its Excellent Activity for In Situ H2O2Production

Opposite Effects of Co and Cu Dopants on the Catalytic Activities of Birnessite MnO2 Catalyst for Low-Temperature Formaldehyde Oxidation

Facile preparation, characterization, and formaldehyde elimination performance of MnOx/natural loofah composites

Contact Info

Product

Resources

About

Electrocatalyst Derived from Abundant Biomass and its Excellent Activity for In Situ H₂O₂Production

Electrocatalyst Derived from Abundant Biomass and its Excellent Activity for In Situ H₂O₂Production

Opposite Effects of Co and Cu Dopants on the Catalytic Activities of Birnessite MnO₂ Catalyst for Low-Temperature Formaldehyde Oxidation

Facile preparation, characterization, and formaldehyde elimination performance of MnO_x/natural loofah composites