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Activated Alumina CAS: 1344-28-1
Activated alumina is made from Aluminum Hydroxide by dehydroxy, which produces highly porous materials. The surface area of this material can significantly exceed 200m²/ g. The compound is used as a desiccant (to keep it dry by absorbing moisture from the air) and as a filter for fluoride, arsenic and selenium in drinking water. It is made of alumina (alumina; Al2O3). It has a very high surface area/weight ratio due to its many "tunnel-like" holes. The phase composition of activated alumina can only be expressed in metastable form (γ-Al2O3, etc.). Corundum (α-Al2O3), the only stable form of alumina, does not have such a chemically active surface and therefore cannot be used as an adsorbent.
application
Activated alumina spheres are widely used, so it is necessary to introduce their specific applications. The specific application of industrial activated alumina balls is divided into six categories:
1. General adsorbent, used for adsorption and drying of all kinds of hydrocarbon gases, natural gas, petroleum cracking gas, etc
. 2. Chlorine agents are used to remove fluoride in drinking and industrial water.
3. Regenerative agent, used for producing hydrogen peroxide by anthraquinone method.
4. Dechlorination agent - used for the dechlorination of various gases and viscous resins and other liquids.
5. Catalyst carrier, used as a variety of catalyst carrier.
6. Air separation desiccant - air separation desiccant
Factors affecting adsorption performance:
(1) particle size: the smaller the particle size is, the higher the adsorption capacity is, but the smaller the particle size is, the lower the particle size strength is, which affects its service life.
(2) the pH value of raw water: when the pH value is greater than 5, the lower the pH value, the higher the adsorption capacity of activated alumina.
(3) Initial fluoride concentration in raw water: the higher the initial fluoride concentration, the greater the adsorption capacity.
(4) basicity of raw water: high concentration of bicarbonate in raw water will reduce its adsorption capacity.
(5) chloride ions and sulfate ions.
(6) The effect of arsenic: activated alumina has adsorption effect on arsenic in water. The accumulation of arsenic on activated alumina will lead to the decrease of fluoride ion adsorption capacity, and it is difficult to elute arsenic ion during regeneration.
Product Categories : Inorganic Chemicals > Oxide
