Co‐Adsorption of Copper(II) and 3‐Amino‐1,2,4‐triazole at a Water–Natural Macromolecular Compound Interface: Molecular Structure from Adsorption Isotherms Combined with X‐ray Absorption Measurements

Abstract

The co-adsorption of Cu II and amitrole at a water-natural macromolecular compound interface was studied by means of batch adsorption experiments, Fourier transform infrared, and X-ray absorption spectroscopy. The binary systems, aqueous amitrole-Cu II complex, and amitrole and Cu II adsorbed on the surface of the solid were studied. The ternary system was investigated over the pH range 2-10 and at varying metal concentrations. The combination of macroscopic and molecular information shows that Cu II and amitrole interact directly at the water-solid interface to form ternary surface complexes. A two-step mechanism is proposed whereby initial formation of a Cu II -amitrole aqueous com-

Use of a Low‐Cost Biosorbent to Remove Pesticides from Wastewater

“…At lower pH, the percentage of TER adsorbed without Cu(II) ions is 30%, whereas in presence of Cu(II) ions the percentage decreases to 20%, probably due to a competitive effect. This result differs from the results of Flogeac et al (2005), where the amount of amitrole adsorbed increased in the presence of Cu(II). Sheals et al (2003) showed similar results with the glyphosate.…”

A Full Multiple Scattering Model for the Analysis of Time-Resolved X-ray Difference Absorption Spectra

“…This increases greatly the sensitivity of the experiment (differential signals below 10 -4 optical density (OD) can be identified, thanks also to the high stability of synchrotron sources), while largely reducing systematic errors such as intensity fluctuations or deterioration of the sample during the experiment. , Recently, a variant of this approach was used in a dispersive XAS setup, to retrieve by EXAFS very small structural changes induced by magnetostriction on an iron−cobalt film . These studies show the potential of differential X-ray absorption spectroscopy, not only in the case of light-induced or magnetic-field induced changes, but also when the changes are induced by temperature, , pressure, , pH changes (important in biology), − and so forth.…”