A multifunctional membrane, prepared by filtration of partial deacetylated chitin nanofibers, was reported to realize one-step green recovery of noble metal ions from surfactant-stabilized oil/water emulsions. The chitin nanofibrous membrane (CNFM) has nanoporous structure with superhydrophilic and underwater superoleophobic surface and could effectively separate oil/water emulsion. Combining with the chelation ability/reduction of amino groups of chitin, CNFM could simultaneously extract noble metal ions from oily wastewater. Furthermore, the noble metal ions adsorbed on the CNFM could be in situ reduced into metal nanoparticles (NPs) by amino groups on chitin without adding extra reducing agents, to yield NPs-loaded CNFM. Surprisingly, the recovered NPs-loaded CNFM maintained excellent catalytic activities and even displayed peroxidase mimic behavior, showing high potentials in biosensing, green catalysis and related fields. Hence, this work provides a simple and sustainable way to realize directly recovery of noble metal ions from oil/water emulsion.
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http://dx.doi.org/10.1016/j.carbpol.2019.115064 | DOI Listing |
ACS Appl Mater Interfaces
January 2025
State Key Laboratory of Fine Chemicals, Research and Development Center of Membrane Science and Technology, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.
The electrocatalytic nitrogen reduction reaction (eNRR) is an attractive strategy for the green and distributed production of ammonia (NH); however, it suffers from weak N adsorption and a high energy barrier of hydrogenation. Atomically dispersed metal dual-site catalysts with an optimized electronic structure and exceptional catalytic activity are expected to be competent for knotty hydrogenation reactions including the eNRR. Inspired by the bimetallic FeMo cofactor in biological nitrogenase, herein, an atomically dispersed FeMo dual site anchored in nitrogen-doped carbon is proposed to induce a favorable electronic structure and binding energy.
View Article and Find Full Text PDFSmall
January 2025
Institute of Materials for Energy and Environment, College of Materials Science and Engineering, Qingdao University, Qingdao, 266071, P. R. China.
Construction of core-shell structured electrocatalysts with a thin noble metal shell is an effective strategy for lowering the usage of the noble metal and improving electrocatalytic properties because of the structure-induced geometric and electronic effects. Here, the synthesis of a novel core-shell structured nanocatalyst consisting of a thin amorphous Pd shell and a crystalline PdCu core and its significantly improved electrocatalytic properties for both formic acid oxidation and oxygen reduction reactions are shown. The electrocatalyst exhibits 4.
View Article and Find Full Text PDFMaterials (Basel)
December 2024
Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland.
Cyclic voltammetry (CV) can be applied as a reliable method for the determination of chloride ions in a range from several to a couple hundred (about 200) ppm. Since the standard potential of chloride ion/gaseous chlorine is 1.36 V vs.
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December 2024
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, China.
Catalyzing hydrogen evolution reaction (HER) is a key process in high-efficiency proton exchange membrane water electrolysis (PEMWE) devices. To replace the use of Pt-based HER catalyst, tungsten carbide (WC) is one of the most promising non-noble-metal-based catalysts with low cost, replicable catalytic performance, and durability. However, the preparation access to scalable production of WC catalysts is inevitable.
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December 2024
Department of Environment and Sustainable Development, Singidunum University, Danijelova 32, 11010 Belgrade, Serbia.
The growing demand for metal production promotes the search for alternative sources and novel modalities in metallurgy. Flotation tailings are an important secondary mineral resource; however, they might pose a potential environmental threat due to containing toxic metals. Therefore, proper leaching reagent selection is required.
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