To provide a filter medium, a process for producing filter medium, a filtration device, a method for operating the filtration device, and a filtration system, which are capable of promptly regenerating the adsorption power by backwashing and realizing efficient operation of a filtration device. The filter medium of the present invention contains a carbon-based material in which a cumulative pore volume of pores having a pore radius of 2 nm or less is 25% or less with respect to a cumulative pore volume of pores having a pore radius of 50 nm or less.

The present invention relates to an adsorption filter including activated carbon and a fibrillated fibrous binder, in which the activated carbon has a 0% particle diameter (D0) of 10 μm or more in a volume-based cumulative particle-size distribution and has a 50% particle diameter (D50) of 90 to 200 μm in the volume-based cumulative particle-size distribution; the fibrillated fibrous binder has a CSF value of 10 to 150 mL; and the adsorption filter includes 4 to 8 parts by mass of the fibrillated fibrous binder relative to 100 parts by mass of the activated carbon.

A positive electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same. The positive electrode may include a current collector and a positive active material layer on the current collector, wherein the positive active material layer may include a positive active material and a Fe-containing oxide, and the Fe-containing oxide is included in an amount of about 0.015 parts by weight to about 8.5 parts by weight based on 100 parts by weight of the positive active material.

Provided is a granular activated carbon that can be used for applications similar to wood-based steam-activated carbons; and also provided is a method for manufacturing the same. The granular activated carbon is obtained in the following manner. An activated carbon raw material is carbonized, and then pulverized. The pulverized product is then mixed with a calcium component, and the mixture is molded. Subsequently, the molded product is carbonized and activated, followed by washing.

The present disclosure pertains to materials for CO.sub.2 adsorption at pressures above 1 bar, where the materials include a porous material with a surface area of at least 2,800 m.sup.2/g, and a total pore volume of at least 1.35 cm.sup.3/g, where a majority of pores of the porous material have diameters of less than 2 nm as measured from N.sub.2 sorption isotherms using the BET (Brunauer-Emmett-Teller) method. The present disclosure also pertains to materials for separation of CO.sub.2 from natural gas at partial pressures of either component above 1 bar, where the materials include a porous material with a surface area of at least 2,200 m.sup.2/g, and a total pore volume of at least 1.00 cm.sup.3/g, where a majority of pores of the porous material have diameters of greater than 1 nm and less than 2 nm as measured from N.sub.2 sorption isotherms using the BET method.

[Object]To provide an adsorbent, an adsorbent sheet, and a carbon/polymer composite for adsorbing a virus having further improved virus adsorption capability. [Solving Means] An adsorbent for adsorbing a virus according to the present invention has a specific surface area value as measured by the nitrogen BET method of 10 m.sup.2/g or more and a pore volume as measured by the BJH method of 0.1 cm.sup.3/g or more. An adsorbent sheet for adsorbing a virus according to the present invention includes a porous carbonaceous material having a specific surface area value as measured by the nitrogen BET method of 10 m.sup.2/g or more and a pore volume as measured by the BJH method of 0.1 cm.sup.3/g or more. A carbon/polymer composite for adsorbing a virus according to the present invention includes a porous carbonaceous material having a specific surface area value as measured by the nitrogen BET method of 10 m.sup.2/g or more and a pore volume as measured by the BJH method of 0.1 cm.sup.3/g or more; and a binder.

Porous three-dimensional networks of polyimide and porous three-dimensional networks of carbon and methods of their manufacture are described. For example, polyimide aerogels are prepared by mixing a dianhydride and a diisocyanate in a solvent comprising a pyrrolidone and acetonitrile at room temperature to form a sol-gel material and supercritically drying the sol-gel material to form the polyimide aerogel. Porous three-dimensional polyimide networks, such as polyimide aerogels, may also exhibit a fibrous morphology. Having a porous three-dimensional polyimide network undergo an additional step of pyrolysis may result in the three dimensional network being converted to a purely carbon skeleton, yielding a porous three-dimensional carbon network. The carbon network, having been derived from a fibrous polyimide network, may also exhibit a fibrous morphology.

An activated carbon powder comprising activated carbon particles that comprise D-band carbon corresponding to a sp.sup.3 hybridized disordered carbon phase and G-band carbon corresponding to a sp.sup.2 hybridized graphitic phase at a controlled proportion. Additionally, the activated carbon particles comprise nitrogen at an amount that is in a range of about 0.3 atomic % to about 1.8 atomic % of the activated carbon particles, wherein at least some of the nitrogen atoms are substituted for carbon atoms in the crystal lattice structure of the G-band carbon. Also, the carbon particles have a surface area that is in a range of about 900 m.sup.2/g to about 2,500 m.sup.2/g, an average pore width in a range of about 1 nm to about 4 nm, a microporous surface area in a range of about 300 m.sup.2/g to about 1,350 m.sup.2/g, and a cumulative surface area of pores with a hydraulic radius in a range of 0.285 nm to 1.30 nm that is in a range of about 1,000 m.sup.2/g to about 3,000 m.sup.2/g.

A method for producing porous graphite capable of realizing higher durability, output and capacity, and porous graphite. A carbon member having microvoids is obtained by a dealloying step for selectively eluting other non-carbon main components into a metal bath by immersing a carbon-containing material, composed of a compound including carbon or an alloy or non-equilibrium alloy, in the metal bath, wherein the metal bath has a solidifying point lower than the melting point of the carbon-containing material, and is controlled to a temperature lower than the minimum value of a liquidus temperature within a composition fluctuation range extending from the carbon-containing material to carbon by reducing the other non-carbon main components. The carbon member obtained in the dealloying step is graphitized by heating in a graphitization step. The carbon member graphitized in the graphitization step is subjected to activation treatment by an activation step.

[OBJECT] To provide an activated carbon for adsorbing per- and polyfluoroalkyl compounds in a water sample, the activated carbon having a high collection rate of per- and polyfluoroalkyl compounds in a water sample, and a filter body using the same.

[ACHIEVING MEANS] An activated carbon for adsorbing per- and polyfluoroalkyl compounds in a water sample to desorbably adsorb per- and polyfluoroalkyl compounds in a water sample, wherein the activated carbon is composed of an activated carbon adsorbent having a BET specific surface area of 800 m.sup.2/g or more or a surface oxide amount of 0.20 meq/g or less, or alternatively, a BET specific surface area of 800 m.sup.2/g or more and a surface oxide amount of 0.50 meq/g or less, and wherein a sum (V.sub.mic) of a volume of micropores of 1 nm or less of the activated carbon adsorbent is 0.30 cm.sup.3/g or more.