Liquid-phase adsorptions inorganic solutes adsorption

Two other methods worth discussing are wet air oxidation and regeneration by steam. Wet oxidation may be defined as a process in which a substance in aqueous solution or suspension is oxidized by oxygen transferred from a gas phase in intimate contact with the liquid phase. The substance may be organic or inorganic in nature. In this broad definition, both the well known oxidation of ferrous salts to ferric salts by exposure of a solution to air at room temperature and the adsorption of oxygen by alkaline pyrogallol in the classical Orsat gas analysis would be considered wet oxidations. 

The role of hydrogen bonds in liquid or vapour-phase adsorption processes has not hitherto been very clearly defined. The present paper is a brief review of some recent investigations in this laboratory, many of them unpublished, which it is believed may help to define the conditions favouring hydrogen bond adsorption especially from dilute solutions, by inorganic and organic substrates. 

Adsorption of both organic and inorganic solutes from the aqueous phase has been a very important application of activated carbons. With current increasing emphasis on the more thorough removal of pollutants from potable and waste waters, the use of carbons and the demands placed on their performance are expected to increase. Many buyers of activated carbon will not be able to afford its underutilization or inefficient use. A similar situation, greatly underutilized carbon adsorbents, exists in liquid chromatography applications, and it has been... 

Activated carbon, by comparison, is the workhorse of the porous carbons. Chapter 8 initially examines the chemistry and mechanisms of adsorption of inorganic and organic compounds from aqueous solution, and then moves on to summarize the most important of gas- and liquid-phase applications. 

The efficiency and selectivity of fuUerenes as adsorbents from aqueous solutions has resulted in a number of analytical applications of C g and C g as chromatography stationary phases, as chemical sensors and, especiaUy, as sorbents for the preconcentration of analytes. In the latter case, the adsorption properties of fuUerenes are more useful for inorganic and organometaUic compounds than for organic compounds. On the other hand, the fuUerenes exhibit a selectivity for aromatic compounds and planar molecules that makes them very attractive as stationary phases for liquid chromatography. 

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