Due to the shape-selectivity of the pores and the induced polymer crosslinking, zeolite filled elastomers are excellent solvent-resistant nanofiltration membranes with enhanced fluxes and retentions compared to commercial membranes, allowing use in non-polar solvents and at high temperatures.
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http://dx.doi.org/10.1039/b500401b | DOI Listing |
RSC Adv
January 2025
Institute of Fundamental Physics (AbinitSim Unit, ABINITFOT Group), Consejo Superior de Investigaciones Científicas (CSIC) E-28006 Madrid Spain
The unique structural properties of zeolites make them ideal environments for encapsulating subnanometric metal clusters on their microporous channels and cavities, showing an enhanced catalytic performance. As a first step towards the functionalization of these clusters as photocatalysts as well, this work addresses the optical properties of zeolite-encapsulated Cu-TiO nanoparticles as well as their application in the photo-induced activation of CO by sunlight. Model density functional theory (DFT) calculations indicate the stability of the Cu cluster adsorbed on the TiO nanoparticles filling the pores of a model zeolite structure.
View Article and Find Full Text PDFJ Environ Manage
January 2025
College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China; School of Automation, The Belt and Road Information Research Institute, Hangzhou Dianzi University, Hangzhou, 310018, China. Electronic address:
In this study, a combined system of anaerobic-oxic-anoxic-oxic, coagulation and adsorption (AOAOCA) was used to treat the real waste transfer station (WTS) wastewater. The effects of hydraulic retention time (HRT), sludge reflux ratio (SRR), mixed liquid reflux ratio (MLRR), coagulant and zeolite on the contaminants removal efficiency were investigated. When the AOAOCA system was operated at the optimal conditions (HRT of 8 d, SRR of 70%, MLRR of 200%, PAFC as coagulant with dosage of 750 ppm and 1-3 mm zeolite with filling rate of 60%), the effluent COD, NH-N and TP could reach 82.
View Article and Find Full Text PDFACS Appl Mater Interfaces
December 2024
State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
In the present study, a zeolitic imidazolate framework with mixed ligands, ZIF-8-90, was synthesized and embedded into an ultrathin polydimethyldiethoxysilane (PDMDES) matrix to prepare a ZIF-8-90/PDMDES mixed matrix membrane (MMM) for the enhanced recovery of alcohols from dilute aqueous solutions via pervaporation, using a facile solution coating method. The synthesized ZIF-8-90 particles demonstrated superior hydrophobicity and thermal stability compared to those of both ZIF-8 and ZIF-90 particles. Furthermore, the hydrophobicity, thermal stability, and sorption ability for alcohols of the ZIF-8-90/PDMDES MMM were significantly improved, attributed to the incorporation of mixed-ligand ZIF-8-90.
View Article and Find Full Text PDFMaterials (Basel)
October 2024
Electric Power Research Institute of Guizhou Power Grid Co., Ltd., Guiyang 550002, China.
Enlarging the M-Nx active-site density is an effective route to enhance the ORR performance of M-N-C catalysts. In this work, a single-atom catalyst Cu-N@Cu-N-C with enlarged Cu-N active site density was prepared by the second doping and pyrolysis (SDP) of Cu-N-C derived from Cu-doped zeolite imidazole frameworks. The half-wave potentials of Cu-N@Cu-N-C were measured as 0.
View Article and Find Full Text PDFEnviron Res
December 2024
Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, School of Ecology and Environmental Science, Yunnan University, Kunming, 650500, China; Yunnan Field Scientific Station for Restoration of Ecological Function in Central Yunnan of China, Yunnan University, Kunming, 650091, China. Electronic address:
Import of agricultural runoff containing nutrients considerably contributes to eutrophication of receiving water bodies. Surface-flow constructed wetlands (SFCWs) are commonly applied for agricultural runoff purification, but the performance is usually unsatisfactory. In this study, suspended bio-balls filled with zeolite and iron-carbon (Fe-C) composite substrates, submerged macrophyte (Ceratophyllum demersum) and functional denitrifying bacteria were collectively added into SFCW microcosms to enhance the remediation efficiency for real agricultural runoff with high nutrient concentrations and low content of bioavailable organic matter.
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