Metal-organic framework-derived transition metal chalcogenides (S, Se, and Te): Challenges, recent progress, and future directions in electrochemical energy storage and conversion systems

Electrolysis is one of the clean, environmentally friendly, and sustainable pathways to produce hydrogen for renewable energy storage. However, to make electrolysis a competitive technology for hydrogen production, developing nonprecious metal‐based catalysts for oxygen evolution reaction (OER) is mandatory. Several new classes of electrocatalysts are developed with outstanding OER catalytic activity, stability, and commercial viability. Owing to the structural diversity, porosity, and accessibility of catalytically active metal centers, nickel‐based metal–organic frameworks (MOFs) are intensively explored as OER catalysts. In particular, bi‐ and trimetallic Ni MOFs with Fe and Co as additional metal nodes show excellent OER activity which can be tailored through the fine tuning of the metal compositions. Herein, the current state of research in Ni‐based MOFs as OER catalyst materials for alkaline electrolysis is presented. Strategies to improve the catalytic performance like compositional variations, choice of synthetic routes, and support materials are presented. Furthermore, OER activities are compared and presented based on the performance metrics (current density, overpotential, and Tafel slopes). Finally, concluding remarks featuring the key findings in Ni‐based MOFs and the possible rooms for future developments are summarized.

https://onlinelibrary.wiley.com/doi/pdfdirect/10.1002/sstr.202200263

Minireview: Ni–Fe and Ni–Co Metal–Organic Frameworks for Electrocatalytic Water‐Splitting Reactions

Discharging large amounts of domestic and industrial wastewater drastically increases the reactive nitrogen content in aquatic ecosystems, which causes severe ecological stress and biodiversity loss. This paper reviews three common types of denitrification processes, including physical, chemical, and biological processes, and mainly focuses on the membrane technology for nitrogen recovery. The applicable conditions and effects of various treatment methods, as well as the advantages, disadvantages, and influencing factors of membrane technologies, are summarized. Finally, it is proposed that developing effective combinations of different treatment methods and researching new processes with high efficiency, economy, and energy savings, such as microbial fuel cells and anaerobic osmotic membrane bioreactors, are the research and development directions of wastewater treatment processes.

/pdf/a-comprehensive-review-on-wastewater-nitrogen-removal-and-2ktbdg6m.pdf

A Comprehensive Review on Wastewater Nitrogen Removal and Its Recovery Processes

Impact of leachate and landfill gas on the ecosystem and health: Research trends and the way forward towards sustainability.

Multi-interfacial Dendritic Engineering Facilitating Congruous Intrinsic Activity of Oxide-Carbide/MOF Nanostructured Multimodal Electrocatalyst for Hydrogen and Oxygen Electrocatalysis

Facile Synthesis of Mesoporous Hierarchical TiO2 Micro-Flowers Serving as the Scaffolding of 0D Ag3PO4 Nanoparticles for the Ultra-Fast Degradation of Organic Pollutants

Construction of black phosphorus nanosheets and Ag nanoparticles co-sensitized TiO2 nanorod arrays as high-performance SERS substrate and photocatalyst

Efficient treatment of aged landfill leachate containing high ammonia nitrogen concentration using dynamic wave stripping: Insights into influencing factors and kinetic mechanism.

In this study, to improve the biological treatment of nitrogenous wastewater, a series of hybrid embedding materials were synthesized and applied in microbial immobilization to form novel biocomposites, which utilize MgAl-LDH as additives to modify the polyvinyl alcohol/sodium alginate (PVA/SA) beads. As proved by several characterizations, the synthesized PVA/SA/LDH biocomposites formed well in quality and possessed suitable features, such as the dense surface morphology and three-dimensional internal network structure. By regulating the addition amount of LDHs, a better cross-linking reinforcing effect of PVA/SA/LDH biocomposite was achieved. Among the different synthesized materials, PS0.6LDH (0.6 g addition in each synthesis process) exhibited improved mechanical strength and stability, thereby providing a protected environment for the proliferation of embedded microorganisms. Based on this, a significant treatment performance was observed in the biological process of PS0.6LDH, and the removal efficiencies of TN and COD reached above 90% in the periodic experiments. Microbial community analysis indicated that the dominant microorganisms of the genera Acinetobacter , Chryseobacterium , and unclassified-Enterobacteriaceae contribute to the biological nitrogen removal, and the heterotrophic nitrification-aerobic denitrification and assimilation were the main pathways. This study would be a valuable reference for the development of microbial immobilization technology in the practical applications of wastewater treatment. • Novel PVA/SA/LDH composites applied in microbial immobilization were synthesized. • Synthesized PVA/SA/LDH showed favorable structure features for microbial proliferation. • PVA/SA/LDH bioprocess effectively achieved above 90% of TN and COD removals. • Moderate LDH addition can reinforce mechanical strength for more operation periods. • Bioprocess mechanisms of nitrogen removal by PVA/SA/LDH biocomposite were revealed. 

Synthesis, characterization and performance of microorganism-embedded biocomposites of LDH-modified PVA/SA hydrogel beads for enhanced biological nitrogen removal process

“Trunk-Leaf Vein” structure inspired synthesis of mesoporous Carbon@Nickel oxide/nickel ternary composite for sustainable supercapacitor electrode

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