Metal complex formation on the surface of amorphous aluminium hydroxide part I. Copper (II) complexes of glutamic and aspartic acids

XAFS Spectroscopy Study of Cu(II) Sorption on Amorphous SiO2and γ-Al2O3: Effect of Substrate and Time on Sorption Complexes

“…There have been a number of studies of Cu(II) sorption on ␣-SiO 2 (47,48), am-SiO 2 (15, 19, 20, 49 -52), and ␥-Al 2 O 3 (16,20,47,(53)(54)(55), as well as oxyhydroxides and clays containing AlOH groups (14,18,21,56). There are three general conclusions from these previous studies.…”

Structure and Bonding of Cu(II)–Glutamate Complexes at the γ-Al2O3–Water Interface

“…In macroscopic batch experiments, glutamate enhances Cu(II) uptake by Al-and Fe-(hydr)oxides in acidic suspensions and inhibits uptake in alkaline suspensions (11)(12)(13). Davis and Leckie (13) concluded that simple competition between Cu (II)-(hydr)oxide surface complexation and Cu(II)-glutamate complexation in solution is not sufficient to describe Cu(II) uptake in this system.…”

“…For example, an electron spin resonance (ESR) spectroscopic study was used to infer that Cu(II) at an Al-hydroxide surface is predominantly chelated by the amine and neighboring carboxyl functional groups of two glutamate molecules in acidic suspensions and a single glutamate molecule in alkaline suspensions (11). These data provide indirect constraints on the number of Cu(II) bonds and glutamate functional groups that are free to interact with the surface.…”

Adsorption of aspartic acid on kaolinite

“…Although several studies of the adsorption of amino acids to oxides and oxyhydroxides have been reported [1][2][3][4][5][6], less is known about their adsorption to alumino-silicate minerals [7,8]. As major components of soil and silt, kaolinite and other clay minerals are potentially important for the control of the availability and mobility of amino acids in soils and waterways.…”