A compact air purification apparatus which can improve an acetaldehyde removal performance and of which the size can be reduced is provided. A compact air purification apparatus using a photocatalyst includes a housing, a photocatalyst member that is disposed in the housing and contains titanium oxides, a light emitting unit that is disposed in the housing to irradiate the photocatalyst member with ultraviolet light and includes a plurality of LED elements, and a fan that circulates air inside the housing.

An air purifying device (10) for reducing risk of air borne infection. The device has a hollow body having an inlet (14), an outlet (16) and an internal surface comprising a metal oxide layer. A fan (18) moves air through the body in contact with the surface, while a UV source comprises a first section for producing ozone in the air and a second section for producing hydroxyl ions. In one form the device may operate in two modes, a first mode for air purification where ozone output is minimised or not generated at all and a second mode for surface and air sterilisation where ozone output is maximised.

A device for air purification, incorporated into a vehicle, which comprises a case, fixed to the outside of the vehicle and having a longitudinal duct through which air passes, the air entering impure through at least one opening located in the front part, with respect to the direction of travel of the vehicle, and exiting through at least one opening located in the rear part under the suctioning effect of at least one fan disposed in the opening. From the inlet to the outlet, the air purification device successively includes the following devices: a photocatalytic reactor; a reverse microwave; an activated carbon filter; and a HEPA filter, just before the fans located in the outlet conduit.

Devices, systems, and methods to selectively emit scent control material responsive to local conditions of a scent control device. The local conditions may dictate the effectiveness of a given set of output parameters of a scent control device. The scent control device accepts as input, one or more conditional inputs carrying information about the local conditions around the scent control device, such as weather conditions, elevation, barometric pressure, or functional status of the scent control device. Operational programs corresponding to the conditional inputs may be automatically selected based on the combination of conditional inputs to cause the output parameters of the scent control device to match or take into account the local conditions. The scent control device then outputs scent control material such as ozone at a rate effective to control one or more scents to a level that is not perceivable by animals or humans.

The invention provides an air purifier (1) comprising a catalytic converter (100), the catalytic converter (100) comprising (i) a catalytically active material (120) and (ii) a heatable material (130) in thermal contact with said catalytically active material (120), wherein the heatable material (130) is heatable by one or more of an alternating electrical field and an alternating magnetic field, the air purifier (1) further comprising a field generator (140), configured free from electrical contact with the heatable material (130) and configured to heat during operation of the air purifier (1) the heatable material (130) by one or more of the alternating electrical field and the alternating magnetic field.

The present invention relates to an air cleaner and, more particularly, to an air cleaner provided with a housing divided into an outer housing and an inner housing, wherein the outer housing and the inner housing are separated from one another, a photocatalytic filter and a collection filter are installed in the inner housing, and air flows even through the space between the inner housing and the outer housing. The present invention provides an air cleaner comprising: an outer housing defining an inlet and an outlet; an inner housing disposed in the outer housing and formed to be separated from the outer housing; a fan installed in the inner housing to forcibly discharge air in the outlet direction; a photocatalytic filter installed in the inner housing and disposed in the direction in which air from the fan is discharged or in the direction opposite to that in which the air is discharged; and an ultraviolet light source disposed upstream of the photocatalytic filter in the direction of airflow created by the fan in order to irradiate the photocatalytic filter with ultraviolet rays.

A system (10) for removing airborne pathogens can include a housing (1, 4, and 6) having at least one or more chambers, a bipolar ionizer (9A), at least one particle filter (8), and an ultra violet light radiation source (5A) residing in at least one or more chambers. Furthermore, the embodiments can include the use of a ventilation system which can include a fan (3) that draws in surrounding air at an intake (7A) and directs the surrounding air towards the at least one particle filter, the bipolar ionizer, and the ultra violet light radiation source before the ventilation system expels the surrounding air drawn through the intake through an exhaust vent (7B).

A method is disclosed in which a gas of hydrogen and nitrogen, or hydrogen and ammonia, or hydrogen, nitrogen, and ammonia, is introduced to a fluidized bed. The gas flows through the fluidized bed, and titanium dioxide particles are introduced to the fluidized bed to form a fluid mixture of the particles and gas in the fluidized bed. The particles are reacted with the gas in the fluid mixture to form particles including titanium dioxide and nitrogen. The particles can be disposed along an air flow path in operative communication with a light source for air treatment.

A sanitizer has substrates which are coated with an optically-activated nanomaterial TiO2 coating for cleaning air which comes into contact with the surfaces of the coating. UV LED light sources are arranged to emit light to be incident on the surfaces to activate the coatings. There is a large surface for impingement of air on the coatings due to a grille arrangement of the substrates, and the LED-emitted UV light being incident at acute angles on the grille honeycomb structure.

The present invention discloses improved ultraviolet air sterilizers. In accordance with this invention the mean reflected light path of each photon is maximized while turbulence is suppressed in order to uniformly UVC expose all conveyed pathogen particles. This invention discloses novel means of maximizing the utilization of blower power and UVC lamp power toward the destruction of pathogens. The resulting efficiencies facilitate the construction of high flow rate air sterilization systems for large buildings while also facilitating the miniaturization of UVC air sterilization systems for incorporation into personal protective equipment (PPE).