Metal Sulfide Photocatalysts for Lignocellulose Valorization

Wu, Xuejiao; Xie, Shunji; Zhang, Haikun; Zhang, Qinghong; Sels, Bert F.; Wang, Ye

doi:10.1002/adma.202007129

Cited by 140 publications

(121 citation statements)

References 95 publications

(242 reference statements)

Supporting

Mentioning

121

Contrasting

Order By: Relevance

“…From ethylene glycol, the successive oxidation steps of the molecule leads initially to acetaldehyde and acetic acid (Equations ( 21) and ( 22) of Table 1) generation. The 2-methoxyacetaldehyde is formed by absorbed methoxyl and acetyltype species (Equation ( 23) of Table 1 describes the formation from methanol, the original reactant) [27,38]. An additional frequency appearing at 1261-1266 cm −1 for all samples in the presence of methanol-rich mixtures (Figures 4-7) can be ascribed to ethylene glycol [27].…”

Section: Resultsmentioning

confidence: 99%

“…From ethylene glycol, the successive oxidation steps of the molecule leads initially to acetaldehyde and acetic acid (Equations ( 21) and ( 22) of Table 1) generation. The 2-methoxyacetaldehyde is formed by absorbed methoxyl and acetyl-type species (Equation ( 23) of Table 1 describes the formation from methanol, the original reactant) [27,38]. The acetic acid product may likely be the main product responsible for the carboxylate absorbed species detected in the absence of methanol and thus may contribute to the infrared spectra reported over the methanol/water mixture.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

H2 Photoproduction Efficiency: Implications of the Reaction Mechanism as a Function of the Methanol/Water Mixture

et al. 2022

View full text Add to dashboard Cite

The influence of the reaction pathway of the sacrificial molecule oxidation to generate hydrogen is here investigated for lean and rich methanol reaction mixtures. Pt-TiO2 powders promoted or not with tin sulfide were used as catalysts. With the help of in situ infrared experiments under reaction conditions, methanol evolution was shown to take place by hole-related oxidation steps, with alkoxy and carbon-centered species as key radical species. The study analyzed quantitatively the fate and chemical use of the photons absorbed by the solids with the help of the quantum efficiency and the useful fraction of photons observables. Within this framework, the role of the sulfide component to promote photoactivity is interpreted, braiding chemical and photonic information.

show abstract

Section: Resultsmentioning

confidence: 99%

“…From ethylene glycol, the successive oxidation steps of the molecule leads initially to acetaldehyde and acetic acid (Equations ( 21) and ( 22) of Table 1) generation. The 2-methoxyacetaldehyde is formed by absorbed methoxyl and acetyl-type species (Equation ( 23) of Table 1 describes the formation from methanol, the original reactant) [27,38]. The acetic acid product may likely be the main product responsible for the carboxylate absorbed species detected in the absence of methanol and thus may contribute to the infrared spectra reported over the methanol/water mixture.…”

Section: Resultsmentioning

confidence: 99%

H2 Photoproduction Efficiency: Implications of the Reaction Mechanism as a Function of the Methanol/Water Mixture

et al. 2022

View full text Add to dashboard Cite

show abstract

“…It is apparent that Urea-CN possesses a more energetic valence band than p-CN and NCN-CN. This is due to the contribution of the O 2p orbital from the urea functionality that leads to the shift in the valence band toward a more positive value [31].…”

Section: Resultsmentioning

confidence: 99%

Improved carrier dynamics in nickel/urea-functionalized carbon nitride for ethanol photoreforming

Gunawan

Toe

Sun

et al. 2022

Photochem Photobiol Sci

View full text Add to dashboard Cite

Photoreforming has been shown to accelerate the H2 evolution rate compared to water splitting due to thermodynamically favorable organic oxidation. In addition, the potential to simultaneously produce solar fuel and value-added chemicals is a significant benefit of photoreforming. To achieve an efficient and economically viable photoreforming process, the selection and design of an appropriate photocatalyst is essential. Carbon nitride is promising as a metal-free photocatalyst with visible light activity, high stability, and low fabrication cost. However, it typically exhibits poor photogenerated charge carrier dynamics, thereby resulting in low photocatalytic performance. Herein, we demonstrate improved carrier dynamics in urea-functionalized carbon nitride with in situ photodeposited Ni cocatalyst (Ni/Urea-CN) for ethanol photoreforming. In the presence of 1 mM Ni2+ precursor, an H2 evolution rate of 760.5 µmol h−1 g−1 and an acetaldehyde production rate of 888.2 µmol h−1 g−1 were obtained for Ni/Urea-CN. The enhanced activity is ascribed to the significantly improved carrier dynamics in Urea-CN. The ability of oxygen moieties in the urea group to attract electrons and to increase the hole mobility via a positive shift in the valence band promotes an improvement in the overall carrier dynamics. In addition, high crystallinity and specific surface area of the Urea-CN contributed to accelerating charge separation and transfer. As a result, the electrons were efficiently transferred from Urea-CN to the Ni cocatalyst for H2 evolution while the holes were consumed during ethanol oxidation. The work demonstrates a means by which carrier dynamics can be tuned by engineering carbon nitride via edge functionalization. Graphical abstract

show abstract

“…However, TiO 2 technology for the degradation of a β- 5 model dimer involving photocatalysis recently came into limelight ( Murnaghan et al, 2021 ). Besides, TiO 2 , metal sufide photocatalysts are also gaining essence ( Wu et al, 2021 ).…”

Section: Methods Of Lignin Depolymerizationmentioning

confidence: 99%

Endophytes in Lignin Valorization: A Novel Approach

Mattoo

Nonzom

2022

Front. Bioeng. Biotechnol.

View full text Add to dashboard Cite

Lignin, one of the essential components of lignocellulosic biomass, comprises an abundant renewable aromatic resource on the planet earth. Although 15%––40% of lignocellulose pertains to lignin, its annual valorization rate is less than 2% which raises the concern to harness and/or develop effective technologies for its valorization. The basic hindrance lies in the structural heterogeneity, complexity, and stability of lignin that collectively makes it difficult to depolymerize and yield common products. Recently, microbial delignification, an eco-friendly and cheaper technique, has attracted the attention due to the diverse metabolisms of microbes that can channelize multiple lignin-based products into specific target compounds. Also, endophytes, a fascinating group of microbes residing asymptomatically within the plant tissues, exhibit marvellous lignin deconstruction potential. Apart from novel sources for potent and stable ligninases, endophytes share immense ability of depolymerizing lignin into desired valuable products. Despite their efficacy, ligninolytic studies on endophytes are meagre with incomplete understanding of the pathways involved at the molecular level. In the recent years, improvement of thermochemical methods has received much attention, however, we lagged in exploring the novel microbial groups for their delignification efficiency and optimization of this ability. This review summarizes the currently available knowledge about endophytic delignification potential with special emphasis on underlying mechanism of biological funnelling for the production of valuable products. It also highlights the recent advancements in developing the most intriguing methods to depolymerize lignin. Comparative account of thermochemical and biological techniques is accentuated with special emphasis on biological/microbial degradation. Exploring potent biological agents for delignification and focussing on the basic challenges in enhancing lignin valorization and overcoming them could make this renewable resource a promising tool to accomplish Sustainable Development Goals (SDG’s) which are supposed to be achieved by 2030.

show abstract

Metal Sulfide Photocatalysts for Lignocellulose Valorization

Cited by 140 publications

References 95 publications

H2 Photoproduction Efficiency: Implications of the Reaction Mechanism as a Function of the Methanol/Water Mixture

H2 Photoproduction Efficiency: Implications of the Reaction Mechanism as a Function of the Methanol/Water Mixture

Improved carrier dynamics in nickel/urea-functionalized carbon nitride for ethanol photoreforming

Endophytes in Lignin Valorization: A Novel Approach

Contact Info

Product

Resources

About