An ice-templating process was used to fabricate polymer/MOF monoliths, specifically chitosan/UiO-66, as adsorbents for water treatment. The ice-templated macropores enhanced mass transport, while the monoliths could be easily recovered from solution. This was demonstrated by the adsorption of methylchlorophenoxypropionic acid (MCPP, a herbicide compound) from dilute aqueous solution. To enhance the stability, the freeze-dried monoliths were treated with NaOH solution, solvent exchanged, and dried. The treated chitosan/UiO-66 monolith achieved an adsorption capacity of 34.33 mg g (a maximum theoretic value of 334 mg g by the Langmuir model), closer to the capacity (36.00 mg g) of the freshly prepared UiO-66 nanoparticles and much higher than that of the NaOH-washed UiO-66 nanoparticles (18.55 mg g), by performing the tests in 60 ppm MCPP solution. The composite monolith could be easily picked up using tweezers and used for recycling tests. Over 80% of the adsorption capacity was retained after three more cycles. The powder X-ray diffraction and N sorption studies suggested the crystalline structure of UiO-66 was destroyed during NaOH washing procedure. This, however, provides the potential to improve the adsorption capacity by developing methods to fabricate true polymer/MOF composites.
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http://dx.doi.org/10.1021/acsami.7b10872 | DOI Listing |
Adv Mater
January 2025
School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China.
Sulfur conversion reactions are the foundation of lithium-sulfur batteries but usually possess sluggish kinetics during practical battery operation. Herein, a high-entropy single-atom catalyst (HESAC) is synthesized for this process. In contrast to conventional dual-atom catalysts that form metal-metal bonds, the center metal atoms in HESAC are not bonded but exhibit long-range interactions at a sub-nanometer distance (<9 Å).
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College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, Fujian, PR China.
Steam explosion (SE) and cellulase treatment are potentially effective processing methods for by-products, for use in high-value applications. The treatment conditions were optimized by response surface methodology, increasing the soluble dietary fiber (SDF) yield by 1.52 and 1.
View Article and Find Full Text PDFHeliyon
January 2025
Alanya Alaaddin Keykubat University, Rafet Kayis Engineering Faculty, Department of Engineering Basic Science, 07450, Alanya, Antalya, Turkiye.
Removal of Rhodamine B (RhB) from aqueous solutions was performed by the batch adsorption process. Colemanite was characterized as an adsorbent by Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD) and X-Ray Fluorescence (XRF). The effects of contact time, the effect of the initial concentration of the dye, the amount of adsorbent and temperature parameters on the removal of RhB were investigated.
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January 2025
Water Management and Treatment Technologies Institute, King Abdulaziz City for Science and Technology, Riyadh, Saudi Arabia.
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View Article and Find Full Text PDFACS Appl Mater Interfaces
January 2025
Geochemistry Department, Sandia National Laboratories, Albuquerque, New Mexico 87123, United States.
Porous liquids (PLs) are an exciting new class of materials for carbon capture due to their high gas adsorption capacity and ease of industrial implementation. They are composed of sorbent particles suspended in a nonadsorbed solvent, forming a liquid with permanent porosity. While PLs have a vast number of potential compositions based on the number of solvents and sorbent materials available, most of the research has been focused on the selection of the sorbent rather than the solvent.
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