Incorporation of CoO nanoparticles in 3D marigold flower-like hierarchical architecture MnCo2O4 for highly boosting solar light photo-oxidation and reduction ability

Zheng, Juan; Zhang, Lei

doi:10.1016/j.apcatb.2018.05.060

Cited by 363 publications

(91 citation statements)

References 58 publications

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“…The obtained band gap of the Co 2 MnO 4 (0.35 eV) is in good agreement with other theoretical results ranging from 0 eV to 0.5 eV, which were calculated with different theoretical levels [13,57,59]. However, the energy gap of the Co 2 MnO 4 seems too small comparing with the experimental observations, which ranges from 1.69 eV to 2.93 eV from different researchers [60][61][62]. We mention here that all these experimental results were obtained from fitting the UV-Vis absorption spectra [60][61][62], from which the energy gap represents only the optical transition between the conduction band and the valence band.…”

Section: Accepted Manuscriptsupporting

confidence: 88%

“…However, the energy gap of the Co 2 MnO 4 seems too small comparing with the experimental observations, which ranges from 1.69 eV to 2.93 eV from different researchers [60][61][62]. We mention here that all these experimental results were obtained from fitting the UV-Vis absorption spectra [60][61][62], from which the energy gap represents only the optical transition between the conduction band and the valence band. However, there are many impurity states…”

Section: Accepted Manuscriptmentioning

confidence: 84%

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New insight into the effect of fluorine doping and oxygen vacancies on electrochemical performance of Co2MnO4 for flexible quasi-solid-state asymmetric supercapacitors

Liu

Yin

et al. 2019

Energy Storage Materials

194

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Section: Accepted Manuscriptsupporting

confidence: 88%

Section: Accepted Manuscriptmentioning

confidence: 84%

New insight into the effect of fluorine doping and oxygen vacancies on electrochemical performance of Co2MnO4 for flexible quasi-solid-state asymmetric supercapacitors

Liu

Yin

et al. 2019

Energy Storage Materials

194

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“…When they are coupled to each other to form a n-p heterojunction (Bi 2 WO 6 /Bi 2 S 3 /MoS 2 ), the Mott–Schottky curve shows an inverted ‘V-shape’ characteristic ( Figure S5d ). Generally, E VB for p-type semiconductors is very close to the flat-band potential, whereas E CB for n-type semiconductors is very close to the flat-band potential [ 57 ]. The flat-band potential in the n-type semiconductor is 0.1–0.3 eV higher than E CB , whereas that in the p-type semiconductor is 0.1–0.3 eV lower than E VB [ 58 ].…”

Section: Resultsmentioning

confidence: 99%

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Ren

Gong

et al. 2020

Nanomaterials

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Exploiting excellent photocatalytic activity and stable heterostructure composites are of critical importance for environmental sustainability. The spherical Bi2WO6/Bi2S3/MoS2 n-p heterojunction is first prepared via an in situ hydrothermal method using Bi2WO6, Na2MoO4·2H2O, and CH4N2S, in which the intermediate phase Bi2S3 is formed due to chemical coupling interaction of Bi2WO6 and CH4N2S. Scanning electron microscopy indicates that the compactness of the sample can be easily adjusted by changing the contents of S and Mo sources in the solution. The results of ultraviolet–visible (UV–vis) diffuse reflectance spectra, photoluminescence, transient photocurrent response, and electrochemical impedance spectra indicate that the formation of heterojunctions contributes to enhancing visible-light utilization and promoting photogenerated carrier separation and transfer. The composite material is used as a catalyst for the visible light photocatalytic reduction of Cr(VI). Remarkably, the optimal Bi2WO6/Bi2S3/MoS2 n-p heterojunction achieves the greatest Cr(VI) reduction rate of 100% within 75 min (λ > 420 nm, pH = 2); this rate is considerably better than the Cr(VI) reduction rate of pure Bi2WO6. The recycling experiment also reveals that the photocatalytic performance of the n-p heterojunction toward Cr(VI) is still maintained at 80% after three cycles, indicating that the n-p heterojunction has excellent structural stability. The capture experiment proves that the main active species in the system are electrons. The reasonable mechanism of Bi2WO6/Bi2S3/MoS2 photocatalytic reduction Cr(VI) is proposed. Our work provides new research ideas for the design of ternary heterojunction composites and new strategies for the development of photocatalysts for wastewater treatment.

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“…As shown in Fig. 8c and d, E CB values of n-type ZnAlLa-500CLDH and CM-CLDH10 were -0.71 V and -1.27 V (V vs NHE), after transformation from E (SCE) to E (NHE) 56 . As is known to all, Eg = E VB -E CB , calculated value of valence band potential (E VB ) were 2.66 V and 1.9 V.…”

Section: Energy Band Structurementioning

confidence: 82%

Carbonaceous composite materials from calcination of azo dye-adsorbed layered doubled hydroxide with enhanced photocatalytic efficiency for removal of Ibuprofen in water

Shen

Zhu

Zhang

et al. 2019

Preprint

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Background: The discard of used adsorbents may pose a great threat to human health and ecological environment. This work herein reported a facile and feasible method, with aims of (i) reusing the calcined layered double hydroxide (CLDH) adsorbent after azo dye adsorption, and (ii) being further used as a photocatalyst to enhance the degradation of typical pharmaceuticals. Calcination under inner gas flow has been utilized to carbonize adsorbed azo dye and a kind of novel carbonaceous CLDH composite material (CM-CLDH) was synthesized. This fabricated material was used as a catalyst for Ibuprofen removal in water samples under simulated sunlight irradiation.Results: According to our experimental results, combination of carbonaceous material with CLDH showed an enhanced photocatalytic performance compared to original CLDH materials. More than 90% of Ibuprofen could be removed in less than 180 min. Photoluminescent spectra and transient photocurrent examination confirmed that suppressed recombination of photo-induced electrons and holes led to higher photocatalytic activities. Furthermore, conduct band potential (E CB ) of the CM-CLDH became lower (-1.31 V), manifesting higher oxidation ability of accumulated electrons, leading to better photocatalytic activity. Under experimental conditions, the removal efficiency of Ibuprofen by CM-CLDH composite kept above 90% during five cycles.Conclusion: Calcination under inner gas flow can transform organic pollutant-adsorbed CLDH to CM-CLDH composite with higher photocatalytic performance. A feasible way to reuse spent LDH adsorbents was proposed, which is benefit to reduce second pollution of spent adsorbents in environment.

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Incorporation of CoO nanoparticles in 3D marigold flower-like hierarchical architecture MnCo2O4 for highly boosting solar light photo-oxidation and reduction ability

Cited by 363 publications

References 58 publications

New insight into the effect of fluorine doping and oxygen vacancies on electrochemical performance of Co2MnO4 for flexible quasi-solid-state asymmetric supercapacitors

New insight into the effect of fluorine doping and oxygen vacancies on electrochemical performance of Co2MnO4 for flexible quasi-solid-state asymmetric supercapacitors

Spherical Bi2WO6/Bi2S3/MoS2 n-p Heterojunction with Excellent Visible-Light Photocatalytic Reduction Cr(VI) Activity

Carbonaceous composite materials from calcination of azo dye-adsorbed layered doubled hydroxide with enhanced photocatalytic efficiency for removal of Ibuprofen in water

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