Abstract
Publisher Summary This chapter discusses the adsorption of various amino acids from aqueous solutions using MCM-41-type mesoporous molecular sieves based on their adsorption isotherms. The amounts adsorbed strongly depend on the pH and the nature of the individual amino acid––that is, amino acids with acidic side chains are hardly adsorbed, whereas basic amino acids show very high affinities to the mesoporous adsorbent. The uptake of amino acids with nonpolar side chains increases with the chain length. The adsorption complex is proposed to consist of the cationic form of the amino acid attached to the negatively charged silica surface.
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