![]() The ability of some harmful gases to react chemically with other substances can be used to capture them. ![]() Chemisorption Ĭhemisorption utilizes a chemical reaction between the gas and the absorber. The sorbent's ability to capture gases depends on the properties of the gases and their concentrations, including air temperature and relative humidity. The bond strength between captured molecules and the sorbent is small, and molecules can separate from the sorbent and return to the air. The sorbent gradually saturates and loses its ability to capture pollutants. Movable harmful gas molecules collide with the surface of the sorbent and remain therein. Contaminated air travels through the cartridge's bed of sorbent granules. Typically, such sorbents are in the form of granules, and fill the cartridge. These materials ( activated carbon, aluminium oxide, zeolite, etc.) have a large specific surface area and can absorb many gases. Purification methods Absorption Ĭapturing noxious gases may be accomplished by sorbents. Cartridges are of different types, and must be chosen correctly and replaced on an appropriate schedule. Workplace air that is polluted with fine particulate matter or noxious gases but that contains enough oxygen (in the US, this is ruled to be a concentration above 19.5% in the Russian Federation, above 18% ), can be rendered safe via air-purifying respirators. The other is a mechanical filter, which removes only particulates. It is one of two basic types of filters used by air-purifying respirators. This color change may be used for timely replacement of respirators' filters, as an end-of-service-life indicator (ESLI).Ī respirator cartridge or canister is a type of filter that removes gases, volatile organic compounds (VOCs), and other vapors from air through adsorption, absorption, or chemisorption. It has a transparent body and special sorbent that changes color after saturation. ![]() Combined gas and particulate respirator filter for protection against acid gases, the type of BKF ( БКФ). For the database component, see Chemical database § Tools. ![]() This article is about the type of respirator filter. ![]()
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