An adsorbent includes a porous substrate and a carboxylic acid dimer loaded onto the porous substrate. The carboxylic acid dimer is loaded on the surface or in the plurality of holes of the porous substrate. The average pore size of the porous substrate is not smaller than 2 nm. The carboxylic acid dimer is loaded onto the porous substrate by at least one of the following manners: a) the carboxylic acid dimer is loaded onto the porous substrate through a Si—OH bond; b) the carboxylic acid dimer is loaded onto the porous substrate through the exchange between a carboxyl group and chlorine; c) the carboxylic acid dimer is loaded onto the porous substrate through the exchange between a carboxyl group and a hydroxyl group; and d) the carboxylic acid dimer is loaded onto the porous substrate through the coordination of a carboxyl group and aluminum or silicon.

An organic polymer composition (OPC) comprising guanidinium-containing A units interconnected with B units of the formula *—R*).sub.r, wherein each asterisk (*) in A units denotes a connection point with an asterisk in B units; R is a hydrocarbon linking group containing at least one carbon atom; r is an integer of 1, 2, or 3; and the composition necessarily includes an anionic species X.sup.m− with a magnitude of charge m of at least 1, wherein the sum of negative charge provided by anionic species X.sup.m− counterbalances the total positive charge provided by the A units. Also described herein is a method for removing one or more oxoanions from an aqueous source by (i) contacting the aqueous source with the above described OPC to result in absorption of the oxoanion into the OPC to produce an oxoanion-containing OPC; and (ii) removing the oxoanion-containing OPC from the aqueous source.

Disclosed is a method for producing a granular adsorbent for carbon monoxide or carbon disulfide separation. According to the method, incipient wet impregnation and sonication are performed simultaneously and the amount of an impregnation solution and the average particle diameter of a particulate adsorbent are adjusted to optimal ranges to produce a granular adsorbent that is evenly and uniformly impregnated with metal ions, achieving significantly improved carbon monoxide and carbon disulfide adsorption capacities. Also disclosed is a granular adsorbent for carbon monoxide or carbon disulfide separation produced by the method. The granular adsorbent has highly stable physical properties, does not cause problems such as pressure drop or line contamination during use, and is simple to produce because the use of a solvent such as a strong acid or base is not required during production. Also disclosed is a separator including the granular adsorbent.

A problem to be solved by the present invention is to provide a new form of adsorbent suitable for a motor vehicle canister. An activated carbon fiber sheet satisfies one or two or more of conditions for indices, such as a specific surface area, a pore volume of pores having a given pore diameter, and a sheet density. An embodiment, for example, may have: a specific surface area ranging from 1400 to 2300 m.sup.2/g; a pore volume ranging from 0.20 to 0.70 cm.sup.3/g for pores having pore diameters of more than 0.7 nm and 2.0 nm or less; an abundance ratio R.sub.0.7/2.0, which is a ratio of a pore volume of micropores having pore diameters of 0.7 nm or less occupied in a pore volume of micropores having pore diameters of 2.0 nm or less, ranging from 5% to less than 25%, and a sheet density ranging from 0.030 to 0.200 g/cm.sup.3.

An object is to provide a new form of adsorbent suitable for a high performance canister. An adsorbent including activated carbon is used as the adsorbent for the canister and satisfies the following conditions. P.sub.0.2/100 expressed by Equation 1:

P.sub.0.2/100=X÷Y×100  (Equation 1)

is 18% or more, in Equation 1, X represents an amount of adsorbed n-butane gas per 100 parts by weight of the adsorbent at 25° C. under an atmosphere where a gas pressure of n-butane gas is 0.2 kPa, and Y represents an amount of adsorbed n-butane gas per 100 parts by weight of the adsorbent at 25° C. under an atmosphere where a gas pressure of n-butane gas is 100 kPa.

Disclosed herein are nanostructured hierarchical zeolitic materials comprising: a plurality of zeolite nanotubes, each zeolite nanotube comprising a zeolitic wall perforated by a plurality of pores, the zeolitic wall defining a single longitudinal lumen. Also disclosed herein are bolaform structure directing agents comprising: a first hydrophilic end and a second hydrophilic end with a hydrophobic core therebetween; the hydrophobic core comprising one or more aromatic rings and one or more hydrophobic alkyl groups; the one or more aromatic rings comprising a biphenyl group; the one or more hydrophobic alkyl groups each independently comprising a C.sub.10 alkyl group; and the first hydrophilic end and the second hydrophilic end each independently comprising a quinuclidinium group. Also disclosed herein are methods of making and use of the plurality of zeolite nanotubes and the bolaform structure directing agents.

An oil adsorbent is manufactured by including performing heat treatment on a non-woven fabric for low-temperature carbonization, and has the effect of adsorbing and evaporating oil having various carbon numbers ranging from a low boiling point to a high boiling point to remove the oil, has photothermal conversion efficiency, high evaporation efficiency of oil by sunlight, and a high adsorption amount and high adsorption rate, thereby making the adsorption-evaporation cycle fast and efficiently performing the adsorption-evaporation, and has an environmentally friendly effect that does not cause any environmental problems even if the oil adsorbent is put into a river, a sea, or the like and then lost.

The present invention is based on the use of surface adsorption to capture CO.sub.2 molecules from air, without requiring the need for bulk absorption within the bulk of the sorbent. Since surface adsorption is a much faster process than bulk absorption, the present invention offers a greatly increased CO.sub.2 capture rate, as well as a greatly improved energy efficiency, over conventional systems. The invention involves the use of a molecular monolayer of CO.sub.2 sorbent, a process and a system for capturing CO.sub.2 from air employing such a molecular monolayer of CO.sub.2 sorbent.

A filter media composition includes a ferrihydrite material having an average pore size (BJH) in a range from 1 to 3 nm and a surface area (BET) of at least 200 m.sup.2/g or at least 250 m.sup.2/g or at least 300 m.sup.2/g.

A method for separating mixed xylene includes steps that the mixed xylene is subjected to adsorption separation by means of an adsorbent having a metal organic framework material, so that one or more of xylene isomers are separated out. An organic ligand in the metal organic framework material is 2,5-dihydroxy-1,4-benzoquinone. Xylene isomers can be effectively separated using this method.