Articles comprising pressure-sensitive adhesives and methods of their use for removing micro- and nanoplastic particles from various media, including wastewater effluent, laundry effluent, and indoor air, are disclosed.

A method for in-situ generation of nanoflower-like manganese dioxide catalyst on filter material is provided. The method comprises: immersing a filter material in a solution containing sodium lauryl sulfate and nitric acid; first modifying the surface of the filter material by using the sodium lauryl sulfate so that a charge layer is wound around the surface of the filter material and tightly absorbs H.sup.+ in an acid solution; and then adding potassium permanganate as an oxidant to react with H.sup.30 on the surface of the filter material to generate nano flower-like manganese dioxide in situ on the surface of the filter material, so as to obtain a composite filter material having a denitration function.

Provided is a method of preparing a superabsorbent polymer. More particularly, provided is a method of preparing a superabsorbent polymer, the method capable of preparing the superabsorbent polymer maintaining excellent basic absorption performances such as centrifugal retention capacity, absorbency under load, etc. while also exhibiting an improved absorption rate.

A diffusive air purifier includes an air permeable container containing a chemical sorbent or a sorbent precursor. The sorbent has a chemical composition selected to achieve removal of an air pollutant via a chemical reaction that renders the predetermined air pollutant immobile. A method of manufacturing the diffusive air purifier includes impregnating a porous solid with a solution of sorbent precursor and a binding agent and drying the porous solid. A method of purifying indoor air includes detecting a measured concentration of an airborne chemical in an enclosed location; selecting the diffusive air purifier to adsorb the airborne chemical; and placing the diffusive air purifier in the enclosed location. Air diffuses through the outer container and into the sorbent where the chemical to be removed is retained. Air, free of the target chemical, diffuses out of the container and the process repeats.

Provided is a method for manufacturing a polymer fiber adsorbent having an MOF uniformly distributed in the matrix thereof, the method comprising the steps of: spinning a spinning dope comprising a polymer matrix and a metal precursor of an MOF to prepare a polymer fiber adsorbent precursor comprising the metal precursor; and contacting the polymer fiber adsorbent precursor with an organic ligand of the MOF to form an MOF in the polymer fiber adsorbent precursor. A polymer fiber adsorbent manufacturing method provided by an aspect of the present invention offers a method capable of easy synthesis of an MOF which is sensitive to water, thereby obtaining a polymer fiber adsorbent excellent in terms of adsorption performance and long-term stability.

A method of producing a porous carbon composite fibrous mats formed of a network of carbon fibers incorporated with porous carbon particles. The method includes electrospinning a polymer solution to form a porous layer of polymeric fibers and the polymeric fibers are doped with a precursor of conductive metal particles, wherein the polymer solution includes a polymer and the precursor of the conductive metal particles, electrospraying a metal organic framework suspension onto the porous layer of polymeric fibers, wherein the metal organic framework suspension includes metal organic framework particles, repeating the electrospinning and electrospraying in an alternating manner to form a porous network of polymeric fibers incorporated with the metal organic framework particles, and heating the porous network of polymeric fibers incorporated with the metal organic framework particles to form the porous carbon composite fibrous mats. The porous carbon composite fibrous mats and its applications thereof are also disclosed herein.

A process for forming a composite absorbent structure by advancing a nonwoven web including from 20% to 100% by weight of superabsorbent fibers. Superabsorbent particles may be distributed to the nonwoven web and at least some of the superabsorbent particles may be drawn into void spaces of the nonwoven web to form the composite absorbent structure. The composite absorbent structure may include a nonwoven web comprising from 20% to 100% by weight of superabsorbent fibers, and the superabsorbent particles may be distributed heterogeneously into void spaces within the nonwoven web. The composite absorbent structure may be used in an absorbent article.

A method for producing a chemical reactor device based on a fluid flow comprises obtaining a substrate with a fluid channel defined by a channel wall, in which an ordered set of silicon pillar structures is positioned in the fluid channel and electrochemically anodising at least the silicon pillar structures to make the silicon pillar structures porous at least to a certain depth. After the anodising, the substrate and pillar structures are thermally treated, the treatment being carried out at a temperature, with a duration and in an atmosphere such that any silicon oxide layer formed has a thickness of less than 20 nm. The substrate and the pillar structures are further functionalized.

Magnetic nanoparticle coated porous materials for recovering a contaminant from contaminated water are provided. In embodiments, such a material comprises a porous substrate having a solid matrix defining a plurality of pores distributed through the solid matrix and further comprising a coating comprising magnetic nanoparticles on surfaces of the solid matrix.

A solid fiber is described, where the solid fiber is characterized by (a) a modification degree Do/Di, in a cross section of the solid fiber of 1.20 to 8.50 where the inscribed circle diameter is denoted by Di and the circumscribed circle diameter is denoted by Do; and (b) a porous specific surface area of not less than 30 m.sup.2/g.