Disclosed are a hydrocarbon adsorption and desorption complex that reduces emission of hydrocarbon from vehicle exhaust gas and improves hydrothermal stability of a device, and a method for preparing the same. The hydrocarbon adsorption and desorption complex may have improved adsorption ability of the hydrocarbon as metal ions are bound to a gas adsorbing portion containing aluminum, and may have improved hydrothermal stability as a reinforcing portion made of silica is formed on a surface of the gas adsorbing portion.

To provide a heavy metal adsorbent in which elution of aluminum from a zeolite is suppressed. A compound, which is a hydrous oxide or a hydroxide of Si, Ti, Zr, Ce or La, is mixed with the zeolite.

An object is to provide an adsorbent using activated carbon fiber, the adsorbent being suitable for motor vehicle canisters and enabling reduction in pressure loss.

An activated carbon fiber sheet for a motor vehicle canister fulfils the following conditions (1) to (4). (1) The sheet has a specific surface area ranging from 1100 to 2300 m.sup.2/g. (2) The sheet has a density ranging from 0.010 to 0.200 g/cm.sup.3 or less. (3) The sheet has a thickness ranging from 0.1 to 100.00 mm. (4) The sheet has a fiber size of 13.0 μm or larger.

The present disclosure provides a hydrocarbon adsorbent including a core-shell particle including a core and a shell surrounding the core, wherein the core includes ion-exchanged zeolite that is ion-exchanged with a metal other than silicon (Si) and aluminum (Al) and the shell includes a mesoporous metal oxide.

Purified air is provided, having a TVOC content of from less than 5 ppb to about 500 ppb, a Biologicals content of from less than 1 CFU/M.sup.3 to 150 CFU/M.sup.3 and a Particulate content of from about 1,000 0.3 μm particles per ft.sup.3 to about 50,000 0.3 μm particles per ft.sup.3, or from about 600 0.5 μm particles per ft.sup.3 to about 500,000 0.5 μm particles per ft.sup.3.

High-capacity dispensable moisture and hydrogen getter to be used as sealant and/or to control the level of these substances in electronic or optoelectronic sensitive devices, its use for the hermetic sealing or semi-hermetic sealing of such electronic or optoelectronic sensitive devices and a method to control the level of contaminants within them.

A sorbent cartridge device includes an ion-exchange material containing zirconium phosphate and no more than about 0.1 mg of leachable phosphate ions per about 1 g of the ion-exchange material. In one example, the cartridge also includes a phosphate-adsorbing material containing zirconium oxide. In this example, the weight ratio between zirconium phosphate and zirconium oxide in the cartridge is from about 10:1 to about 40:1. The zirconium phosphate may be alkaline zirconium phosphate prepared by a process including the following steps: (i) drying acid zirconium phosphate to obtain a dry acid zirconium phosphate; (ii) combining the dry acid zirconium phosphate with an aqueous solution to obtain an aqueous slurry; and (iii) combining the slurry with an alkali hydroxide to obtain the alkaline zirconium phosphate. During step (ii), any free phosphate ions in the dry acid zirconium phosphate leach out into the aqueous phase of the slurry.

Sorbent compositions containing calcium and iodine are added to coal to mitigate the release of mercury and/or other harmful elements into the environment during combustion of coal containing natural levels of mercury.

Provided is a method for easily and inexpensively separating a rare earth element contained in an aqueous solution.

The invention relates to a composite material, suitable for treating water. The composite material comprises an active layer and a substrate layer, with the active layer including titanium dioxide and silver nanoparticles. The active layer is bonded to the substrate layer such that, in use, there is substantially no leaching of the active layer into the body of water. The invention further relates to a method of preparing the composite material.