Air filter media comprising at least one active bead layer comprises an antistatic agent and polyethylenimine coated polymeric beads that can provide better formaldehyde abatement properties than incumbent activated carbon filters and can be prepared by using existing processing facilities for manufacture of incumbent activated carbon filters.

An air filtering system includes a main system and a filtering module. The main system includes a main body having an air inlet, an air flow cover having an air outlet, and a primary filtering core replaceably disposed in the main body, wherein the air flow cover is detachably coupled at the main body to form a basic air filtering mode for filtering air from the air inlet to the air outlet through the primary filtering core. The filtering module is detachably coupled between the main body and the air flow cover to form an advanced air filtering mode, wherein the filtering module includes a secondary filtering core arranged for filtering the air after passing through the primary filtering core and before existing the air outlet.

In various embodiments, methods of treating a space to reduce a concentration of volatile organic compounds present in the space using chlorine dioxide are provided. A method can include application of aqueous and gaseous chlorine dioxide solutions within the space or to materials located within the space. Treatment of materials that emit volatile organic compounds with chlorine dioxide can reduce the emission rate or shorten the volatile organic compound emission cycle of the material. Soft surface substrates such as carpeting materials can be treated with chlorine dioxide to reduce volatile organic compound emission and/or to reduce the number of microorganisms present in the material.

A dehumidifying element includes a plurality of sheets that have moisture adsorption and desorption properties and that are stacked on top of each another. At least some of the sheets each have an irregular shape. The sheets each contain a hygroscopic agent having properties of a re-moistening-type glue that exhibits adherence when adsorbing moisture and that solidifies when being dried. The sheets are bonded to each other by the hygroscopic agent.

An air conditioning (AC) system is provided, employing a sulfonated copolymer (SC) layer as a selectively permeable and ion exchanging membrane. The sulfonated block copolymer has an IEC greater than 0.5 meq/g. In embodiments, the sulfonated block copolymer is used to form the membrane itself, or bonded/coated onto a membrane or a foam. In embodiments, the AC employs a membrane electrode assembly, i.e., using electric field across a membrane in a dehumidifier to transport moisture generating a dry air stream, along with an evaporative cooler for latent heat removal via evaporation induced cooling of the dry air stream from the dehumidifier. The system operates as a closed loop wherein the room air after cooling is recycled or loop back to the dehumidifying membrane electrode assembly to generate dry air for the evaporative cooler, generating conditioned air.

One variation of a method includes: conveying a mixture of air in a working fluid through a compressor to heat and pressurize the mixture to promote absorption of carbon dioxide into the working fluid; depositing the mixture in a high-pressure vessel configured to remove air from the mixture of carbon dioxide in the working fluid; conveying the mixture through a turbine to reduce pressure and promote desorption of carbon dioxide from the working fluid; depositing the mixture in a low-pressure vessel for removal of carbon dioxide; in response to a temperature of an interior environment falling below a target range, conveying the working fluid through a heating element configured to transfer heat from the working fluid into the interior environment; and, in response to the temperature exceeding the target range, conveying the working fluid through a cooling element configured to transfer heat from the working fluid into an exterior environment.

A plasma air purifying device includes a container and at least one plasma-generating element. The container includes a container body, a plurality of first partition plates and a plurality of second partition plates. The container body has an air inlet, an air outlet, and an accommodating space between the air inlet and the air outlet, and the accommodating space includes a plasma zone and a reaction zone. The first partition plates and the second partition plates are staggered in the reaction zone to separate a plurality of reaction chambers. The reaction chambers integrate spatially first through channels of the corresponding first partition plates and second through channels of the corresponding second partition plates so as to form a repetitive bending reaction channel, such that the plasma can purify the air flowing through the air inlet, the plasma zone, the repetitive bending reaction channel and the air outlet.

Air purification and dehumidification apparatus includes a first cooler that cools air introduced through a first inlet, a first rotor that primarily adsorbs and absorbs VOCs and moisture contained in the air cooled by the first cooler, an air conditioning unit that cools or heats the air primarily purified and dehumidified by the first rotor, a blower that moves the air cooled or heated by the air conditioning unit, a second rotor that adsorbs and absorbs VOCs and moisture remaining in the air moved by the blower, a second cooler that re-cools the air secondarily purified and dehumidified by the second rotor, a first heating unit that heats air that is introduced through a second inlet and is then supplied to the first rotor, using sequentially solar energy and electric energy, and a third cooler that condenses air containing the VOCs and moisture that are released from the first rotor.

Embodiments of the present disclosure are directed to systems and methods for removing formaldehyde from indoor air. Some embodiments include flowing an indoor airflow over and/or through a solid supported amine filtering medium, such that, at least a portion of formaldehyde entrained in the indoor airflow is removed therefrom. Some other embodiments include systems having one or more fans for providing velocity to one and/or another airflows (e.g., airflows to/from a formaldehyde filter).

A hydro-enhanced air cleaner is provided as a stand-alone unit or as a component of a heating, ventilation, air conditioning system for a building which cleans and purifies ambient air and is also capable of producing potable water in humid environments. The device includes a dehumidifier which extracts polluted humid air and produces condensate including water and pollutants which adhere to the water. A degasser is connected with the dehumidifier to purify and degas the condensate to produce deionized water and pollutants. A humidifier is connected with the degasser to vaporize at least a portion of the deionized water for delivery to a living space. Excess deionized water may be collected as a potable water supply. In accordance with a method, the apparatus is used to continuously recycle air within a building further continuously clean the air.