The present invention relates to a carbon dioxide adsorbent based on a hydrophobic silane-coated amine-functionalized MOF/alumina composite and, more specifically, to a carbon dioxide adsorbent based on a hydrophobic silane-coated amine-functionalized MOF/alumina composite, capable of maintaining structural stability by means of the moisture present in exhaust gas, and thus can effectively capture carbon dioxide in a real fluidized bed. According to the present invention, provided are a carbon dioxide adsorbent and a preparation method therefor, the carbon dioxide adsorbent being capable of maintaining structural stability by means of the moisture present in exhaust gas since the surface of a porous metal-organic framework/alumina oxide composite is coated with hydrophobic silane.

The present invention relates to a carbon dioxide adsorbent based on a hydrophobic silane-coated amine-functionalized MOF/alumina composite and, more specifically, to a carbon dioxide adsorbent based on a hydrophobic silane-coated amine-functionalized MOF/alumina composite, capable of maintaining structural stability by means of the moisture present in exhaust gas, and thus can effectively capture carbon dioxide in a real fluidized bed. According to the present invention, provided are a carbon dioxide adsorbent and a preparation method therefor, the carbon dioxide adsorbent being capable of maintaining structural stability by means of the moisture present in exhaust gas since the surface of a porous metal-organic framework/alumina oxide composite is coated with hydrophobic silane.

A method for preparing the ferrous sulfide-containing passivator includes: dissolving a sulfide in an alkaline solution to form a mixed solution with a pH of 12-13; adding sodium silicate to the mixed solution and stirring for 0.5-1 hour at 20-40° C.; adding an aqueous solution of ferrous salt to the mixed solution containing sodium silicate, and allowing to react at 40-60° C. for 2-3 hours; where, with decrease of the pH of the mixed solution, sodium silicate is converted into silica nanoparticles, and the ferrous salt reacts with the sulfide to form ferrous sulfide; and further adding an aqueous solution of an organic modifier, and allowing to react at 40-60° C. for 1-2 hours to form a passivator slurry including surface-modified ferrous sulfide doped with silicon dioxide; filtering the passivator slurry to form a passivator.

A method for preparing the ferrous sulfide-containing passivator includes: dissolving a sulfide in an alkaline solution to form a mixed solution with a pH of 12-13; adding sodium silicate to the mixed solution and stirring for 0.5-1 hour at 20-40° C.; adding an aqueous solution of ferrous salt to the mixed solution containing sodium silicate, and allowing to react at 40-60° C. for 2-3 hours; where, with decrease of the pH of the mixed solution, sodium silicate is converted into silica nanoparticles, and the ferrous salt reacts with the sulfide to form ferrous sulfide; and further adding an aqueous solution of an organic modifier, and allowing to react at 40-60° C. for 1-2 hours to form a passivator slurry including surface-modified ferrous sulfide doped with silicon dioxide; filtering the passivator slurry to form a passivator.

The present invention relates to a metal-organic framework (MOF) having a three-dimensional porous structure and being represented by the chemical formula of [Al.sub.8(OH).sub.a(BTC).sub.b(IPA).sub.c(L).sub.d], a preparation method therefor, and a use thereof as an adsorbent and a catalyst.

The present invention relates to ZIF nanoparticles introduced with three kinds of ligands, a method for preparing the same, a hybrid membrane including the same, and a gas separation method using the hybrid membrane. Nanoparticles of a zeolitic imidazolate framework (ZIF) into which three kinds of ligands are introduced, the nanoparticles comprising metal ions, and an organic ligand bound to the metal ion, wherein the organic ligand comprises an imidazole-based first organic ligand, alkylamine-based second organic ligand, and third organic ligand comprising at least one amine group substituted on the ring.

A composite film framework that includes a support; a metal oxide layer on the support; and a metal organic framework film on the metal oxide layer 2, wherein a metal atom is shared by a metal oxide in the metal oxide layer and a metal organic framework in the metal organic framework film at an interface between the metal oxide layer and the metal organic framework film.

A composite film framework that includes a support; a metal oxide layer on the support; and a metal organic framework film on the metal oxide layer 2, wherein a metal atom is shared by a metal oxide in the metal oxide layer and a metal organic framework in the metal organic framework film at an interface between the metal oxide layer and the metal organic framework film.

Water harvesting systems and methods of making and using such water harvesting systems, for capturing water from surrounding air using configurations that reduce overall energy costs and improves water harvesting cycle efficiency in the water harvesting system. In particular embodiments, the water harvesting system can be configured for dehumidification-humidification of air, and a method in the water harvesting system for dehumidification-humidification to control moisture level in the air conditioned by the water harvesting system. The systems and methods use sorbent materials, such as metal-organic frameworks, to adsorb water from the air. The systems and methods desorb this water in the form of water vapor, and the water vapor can be condensed into liquid water and collected to dehumidify air conditioned by the water harvesting system. The collected liquid water can be sprayed to humidify air conditioned by the water harvesting system.

Yttria containing hybrid organic-inorganic sol-gels may be used in coatings for capillary microextraction, optionally hyphenated to online HPLC analysis. The sol-gel reaction mixture can use an yttrium trialkoxyalkoxide, such as yttrium trimethoxyethoxide, and a [bis(hydroxyalkyl)-amino-alkyl]-terminated polydialkyl/arylsiloxane, such as [bis(hydroxyethyl)-amine] (BHEA)-terminated polydimethylsiloxane, that can undergo hydrolysis and polycondensation, to form coating materials. Capillaries coated with such sol-gels can have improved extraction efficiency compared, e.g., to pure yttria-based coatings. The CME-HPLC can analyze water samples containing analytes of varied polarity, with excellent extraction of amides, phenols, alcohols, ketones, aldehydes, and polyaromatic hydrocarbons and detection limits ranging from 0.18 to 7.35 ng/mL (S/N=3). Such capillaries can exhibit solvent stability at pH 0 to 14, RSD % between 0.6 to 6.8% (n=3), at a preparative reproducibility RSD between 4.1 and 9.9%.