The present invention aims to provide core-shell particles that can be used in a method of separating a substance to be separated and that allow obtainment of a highly purified product. Each of a plurality of core-shell particles (C) of the present invention includes a core layer (P) as magnetic silica particles containing the magnetic metal oxide particles (A) and a shell layer (Q) that is a silica layer on a surface of the core layer (P), an average thickness of a plurality of shell layers (Q) being 3 to 3000 nm, wherein a weight percentage of the magnetic metal oxide particles (A) in the core layer (P) is 60 to 95 wt % based on a weight of the core layer (P), and the plurality of core-shell particles (C) have a particle size distribution with a coefficient of variation of 50% or less.

The disclosed subject matter relates to a microcapsule including a particle core selected from activated carbon (AC), super activated carbon (SAC), MOF composition, multifunctional material or a mixture thereof and a water-soluble polymer shell, including a membrane into which the microcapsule is incorporated, a membrane with exposed AC, SAC, MOF, or multifunctional materials or mixture thereof formed therefrom and methods used is the formation of all of the above.

The present invention relates to a process for the manufacture of microporous carbon materials to perform selective separations of nitrogen in gas mixtures such as hydrogen sulfide, carbon dioxide, methane and C.sub.2, C.sub.3 and C.sub.4.sup.+ hydrocarbons, with high efficiency, shaped of microspheres or cylinders from copolymers of poly (vinylidene chloride-co-methyl acrylate) with density of 1.3 to 1.85 g/cm.sup.3 or poly (vinylidene chloride-co-vinyl chloride) with density of 1.3 to 1.85 g/cm.sup.3, using two stages. The first stage consists of a surface passivation of the material by chemical attack in a highly alkaline alcohol solution, with the aim of effecting a precarbonization on the surface of the copolymer that during the pyrolysis process is not deformed and gradually develops microporosity. The material of the first stage presents, in the layer, percentages between 55% to 85% carbon, between 5% to 20% oxygen, and between 10% to 40% chlorine. The interior of the material presents lower percentages of carbon, between 30% to 65%, oxygen in the amount of between 2% to 6%, and chlorine in the amount of between 30% to 60%. The second stage consists of the gradual pyrolysis of the passivated copolymer, with the aim of developing microporosity and high surface area values; as well as during the melting and gas dehydrohalogenation stages thereof, the deformation of the material is avoided. The morphology of the copolymers are microspheres of 125 to 225 micrometers, or cylinders of 4 mm in height and 3 mm in diameter, which after pyrolysis reduce its size by 35% with respect to the initial one. The material of the second stage, which is already microporous carbon material, presents in the layer percentages between 90% to 100% carbon and between 10% to 0% oxygen.

Provided is a mordenite zeolite which can be produced without using an organic structure-directing agent, and has superior multivalent metal cation exchange capability. The mordenite zeolite according to the present invention containing silicon, a divalent metal M and aluminum in a skeletal structure, wherein the mordenite zeolite has the following atomic ratios in the state of Na-form. The mordenite zeolite preferably has a BET specific surface area of 250 m.sup.2/g or more and 500 m.sup.2/g or less and a micropore volume of 0.07 cc/g or more and 0.25 cc/g or less in the state of Na-form or H-form. Si/(M+Al)=5 or more and 10 or less, M/(M+Al)=0.1 or more and less than 1, and Na/(M+Al)=1 or more and less than 2

A method for preparing a hollow hydroxyl iron-manganese composite by employing a cubic structure template comprises: (1) preparation of a template: adding a certain mass of potassium permanganate to diluted hydrochloric acid, and dissolving and mixing evenly the same by magnetic stirring at room temperature; then adding polyvinylpyrrolidone thereto, and continuing to dissolve the same thoroughly by magnetic stirring; and finally adding a certain mass of potassium ferrocyanide and de-solubilizing the same for 10-60 minutes at room temperature, then transferring the above mixed solution into a sample bottle, and performing an isothermal reaction at 50-90 C. for 18-24 hours to obtain a blue-black deposit, namely a target iron-manganese composite template; and (2) preparation of a hollow iron-manganese composite: evenly dispersing the blue-black iron-manganese composite template obtained in the step (1) to a small amount of anhydrous ethanol, then adding a certain concentration of sodium hydroxide solution thereto, placing the same on a rotary shaker to react at room temperature for 6-12 hours, and then removing a supernatant liquid, so that a black substance remaining at a bottom of a centrifuge tube is a hollow hydroxyl iron-manganese composite having a cubic structure. Also provided are a hollow hydroxyl iron-manganese composite prepared by the above method, and an application thereof to adsorption and removal of heavy metal in water.

A method for producing a core-shell hybrid material made of an activated carbon core surrounded by a mesoporous silica sol-gel shell, the method including the formation of a mesoporous silica sol-gel shell around activated carbon particles. Also, the core-shell hybrid material formed by the method, and its use as a filtering material in filtering systems.

An adsorbent composition, adsorbent apparatus, and gas purification process using the absorbent composition are provided for the removal of hydrogen sulfide from a gas containing at least hydrogen sulfide as an impurity. The adsorbent composition includes a combination of at least one carbon material, at least one clay material, and at least one metal oxide. In particular, the combination of carbon material(s), clay material(s) and metal oxide(s) provide for effective removal of hydrogen sulfide from a gas at a reduced cost.

A composite particle is described herein. The composite particle can contain a seed particle of an agricultural treatment material and a shell disposed on the seed particle, wherein the shell comprises a clay.

Provided is a production method for core-shell porous silica particles, the production method including: a preparation step of preparing an aqueous solution comprising non-porous silica particles, a cationic surfactant, a basic catalyst, an electrolyte, and an alcohol; a shell precursor formation step at adding a silica source to the aqueous solution to form a shell precursor on a surface of the non-porous silica particles; and a shell formation step of removing the cationic surfactant from the shell precursor to form a porous shell.

There is disclosed a method of producing etched non-porous particles. The method includes, in some examples, coating a non-porous particle with a hydrophilic polymer and treating the coated particle with acid or base. Also provided is etched non-porous particles capable of separating a variety of analytes, including biomolecules.