Activated alumina

Corundum (alpha-Al2O3), the only stable form of aluminum oxide, does not have such a chemically active surface and is not used as a sorbent.

A study from the Harvard school of Public Health found exposure to high levels of fluoride as a child correlated with lower IQ.

Rajasthan, activated alumina, when used as a fluoride filter, under field conditions can best be regenerated by a solution of lye (sodium hydroxide; NaOH), sulfuric acid (H2SO4).

Chhabra's method can be determined as follows: Fluoride solution: Dissolve 22.1 g anhydrous NaF in distilled water and dilute to 1,000 mL.

Procedure: To one litre of simulated distilled water containing 100 mg/L of fluoride, agitate at 100 rpm using the jar test machine.

In high vacuum applications, activated alumina is used as a charge material in fore-line traps to prevent oil generated by rotary vane pumps from back streaming into the system.

[2] A baffle of activated alumina can also replace the refrigerated trap often required for diffusion pumps, though this is rarely used.

Activated Alumina process is one of the widely used adsorption methods for the defluoridation of drinking water.