The invention relates to regenerative, solid sorbents for adsorbing carbon dioxide from a gas mixture, including air, with the sorbent including a modified polyamine and a solid support. The modified polyamine is the reaction product of an amine and an epoxide. The sorbent provides structural integrity, as well as high selectivity and increased capacity for efficiently capturing carbon dioxide from gas mixtures, including the air. The sorbent is regenerative, and can be used through multiple cycles of adsorption-desorption.

A method for producing a modified sawdust sorbent. The method involves sulfonating sawdust with sulfuric acid and oxidizing the sulfonated sawdust with hydrogen peroxide. The method yields a modified sawdust sorbent containing sulfonated and oxidized cellulose. The modified sawdust sorbent has a higher surface area, higher organic dye adsorption capacity, and more rapid organic dye adsorption rate than unmodified sawdust. Also disclosed is a method of using the modified sawdust sorbent for organic dye removal from water.

Provided is a facilitated CO.sub.2 transport membrane having an improved CO.sub.2 permeance and an improved CO.sub.2/H.sub.2 selectivity. The facilitated CO.sub.2 transport membrane includes a separation-functional membrane that includes a hydrophilic polymer gel membrane containing a CO.sub.2 carrier and a CO.sub.2 hydration catalyst. Further preferably, the CO.sub.2 hydration catalyst at least has catalytic activity at a temperature of 100 C. or higher, has a melting point of 200 C. or higher, or is soluble in water.

Provided is a water-purifying agent formed of a granulated product including a mixture of a plant powder and a polymeric flocculant, wherein a surface of the granulated product includes a coated portion in which the plant powder is coated with the polymeric flocculant and a non-coated portion in which the plant powder is not coated with the polymeric flocculant.

The invention relates to regenerative, solid sorbents for adsorbing carbon dioxide from a gas mixture, including air, with the sorbent including a modified polyamine and a solid support. The modified polyamine is the reaction product of an amine and an epoxide. The sorbent provides structural integrity, as well as high selectivity and increased capacity for efficiently capturing carbon dioxide from gas mixtures, including the air. The sorbent is regenerative, and can be used through multiple cycles of adsorption-desorption.

A composite particle includes a solid particle, and a coating directly on the solid particle, the coating comprising a water-absorbing material. A layer includes a plurality of composite particles in contact, wherein the composite particles are comprised of: a solid particle; and a coating directly on the solid particle, the coating comprising a water-absorbing material. A method of fabricating composite particles includes combining solid particles with at least one precursor, cross-linker, and radical initiator in a solution to cause polymerization and formation of a water-absorbing coating on the solid particles resulting in composite particles, removing the solution and any unreacted precursors, and drying the composite particles. A method of forming composite particles includes mixing solid particles with at least one adhesive and with premade water-absorbing super absorbent polymer particles, curing the adhesive to form a monolithic block of solid particles with water-absorbing polymer coatings, and grinding the block to obtain composite particles.

The super absorbent polymer according to the present invention has reduced 3-hour saline solution re-wet while having a high absorption rate and absorption against pulp, and thus can be used for hygienic materials such as diapers, thereby exhibiting excellent performance.

The subject invention concerns metal or metalloid oxide-based sol-gel hybrid sorbent and methods of synthesis. In one embodiment, the sorbent is a ZrO.sub.2 polypropylene oxide based sol-gel. The subject invention also concerns a hollow tube or capillary internally coated with a sorbent of the invention. Sorbent coated tubes and capillaries of the invention can be used in extraction and/or enrichment of samples to be analyzed for catecholamines and related compounds.

The application is directed to treating wells and subterranean formations in oil and gas well operations using surfactants. Solid treatment particles may be produced comprising one or more solid adsorbent materials and one or more surfactants adsorbed on the one or more solid adsorbent materials. The solid treatment particles are operationally configured to be introduced into wells and/or subterranean formations to carry out one or more treatments in various aspects of a life cycle of oil wells and gas wells.

Methods for purifying urease are described that make use of a precipitating agent such as ammonium sulfate to obtain urease as a precipitate. The method can involve use of a solubilizing agent, such as a citrate-containing solution, to dissolve the precipitate. The method can involve the use of a sugar to provide protected urease in a sugar-urease solution and immobilization of the urease. The method can involve freeze drying of the immobilized urease. A sugar-urease preparation and an immobilized urease, and a sorbent cartridge containing the urease are described as well as methods to conduct dialysis.