Abstract: There is provided an air-treatment device including an airflow generator for generating an airflow, an adsorbent material for adsorbing one or more airborne contaminants, the adsorbent material being arranged such that at least a portion of the airflow passes through the adsorbent material, a heater arranged to heat a portion of the adsorbent material to desorb adsorbed contaminants, and a photocatalytic reactor arranged to receive air containing the contaminants desorbed from the heated portion of adsorbent material. The photocatalytic reactor includes a photo-catalyst for photocatalytic degradation of one or more of the contaminants, and one or more light sources for illuminating the photo-catalyst to facilitate photocatalytic degradation. The air-treatment device is arranged such that at least a portion of the airflow that has not passed through the heated portion of the adsorbent material contacts the one or more light sources.

Abstract: There is provided a photocatalytic reactor arranged to receive one or more airborne contaminants. The photocatalytic reactor includes a photo-catalyst for photocatalytic degradation of one or more of the contaminants disposed on a substrate, and a light-emitting diode circuit board comprising a circuit board with one or more first light-emitting diodes mounted to a first side of the circuit board and one or more second light-emitting diodes mounted to a second side of the circuit board. The substrate is arranged to be illuminated by both the one or more first light-emitting diodes and the one or more second light-emitting diodes in order to facilitate photocatalytic degradation.