Activated alumina

About: Activated alumina is a research topic. Over the lifetime, 1430 publications have been published within this topic receiving 31090 citations.

Water contaminant adsorption composition

Abstract: A very effective adsorption composition has been produced for the removal of heavy metal ions, halocarbons, aromatic organics, radon and microbiological substances from water. This adsorption composition consists of up to 7 different components. These include aluminum silicate, diatomite, granulated activated carbon, catalytic chlorine removal media, tri-sodium phosphate, bone charcoal and activated alumina. This adsorption composition has a tri-disperse structure. By this it is meant it has three different types of pores. The adsorption composition is utilized by being packaged into cartridges, containers and alike where it is held in place while contaminated water passes through the adsorption composition and the contaminants are removed.

Process for removal of carbonyl sulfide from organic liquid by adsorption using alumina adsorbent capable of regeneration

Abstract: An adsorption process is disclosed for removal of carbonyl sulfide (COS) from a liquid hydrocarbon which comprises providing an activated alumina adsorbent which has preferably impregnated with a compound selected from the class consisting of one or more alkali metal compounds, one or more alkaline earth metal compounds, or a mixture of such compounds; passing a liquid hydrocarbon containing COS through the activated alumina adsorbent at a flow rate sufficient to adsorb enough COS in the liquid hydrocarbon to lower the COS content of the liquid hydrocarbon to less than 1 ppm; monitoring the effluent liquid hydrocarbon to determine when the capacity of the adsorbent to adsorb the COS has been reached; and then regenerating the activated alumina adsorbent by passing a gas, heated to a temperature of from about 150° to about 300° C., through the adsorbent for a period of time sufficient to remove a substantial amount of the sulfur adsorbed thereon.

A Critical Review on Occurrence of Fluoride and Its Removal through Adsorption with an Emphasis on Natural Minerals

Abstract: Being the most reactive of all chemical elements and the lightest member of halogen group, fluorine is found in the environment as fluoride. Both natural and anthropogenic activities are responsible for fluoride contamination in groundwater. Fluoride has dual effect on human health. While lower concentration ( 1.5 mg/L) leads to skeletal fluorosis and even death. The present review paper is aimed at providing detailed occurrence of fluoride pollution around the globe and in India. Among the different defluoridation techniques to remove excess fluoride from contaminated drinking water at both community and domestic levels, adsorption is found to be very effective due to its technical feasibility, simple characteristics and comparative low-cost nature. Various adsorbents have been tested for their ability to treat fluoride contaminated water, viz., activated carbon, activated alumina, soil, clay and a variety of waste materials. Since fluoride pollution of drinking water is a major concern of poor people as they cannot afford to spend on purification of water, usage of low-cost natural mineral (natural mineral) as adsorbent for fluoride removal is one of the most essential issues in modern era. The present review bestows a detailed discussion on natural mineral as adsorbent used in defluoridation process with special emphasis on soil and low-cost clay minerals.

Sorption of SO2 on metal oxides in a fluidized bed

Abstract: A preliminary experimental study is described in which a low concentration of SO/sub 2/ (0.2% v/v) is removed from air at temperatures between 358 and 640 K by reaction with bauxite and red mud, which consists of several metal oxides in a lab-size fluidized bed reactor of 5-cm diameter. CuO on activated alumina, a well-known sorbent for SO/sub 2/, was also tested in the same system for comparison. A model based on the two-phase theory of fluidization was used to simulate the sorption process. It was shown that a kinetic rate expression for sorption of SO/sub 2/ on a single metal oxide to yield a metal sulfate can also be used for mixtures of metal oxides by defining an overall apparent rate coefficient and an overall consumption coefficient for active sites. The work identified that bauxite and red mud could also be considered as potential sorbents like CuO for SO/sub 2/ sorption in a typical range of stack gas temperatures.