Wenfeng Tan

TL;DR: Birnessite, cryptomelane and todorokite showed the greatest adsorption capacity on Pb(2+) among the tested heavy metals, and hausmannite had a much higher PZC than others with the least surface variable negative charge.

TL;DR: In this article, the effect of variable substructures on the sorption sites of hexagonal birnessites with various Mn average oxidation states (AOS) was investigated, and the results showed that a decrease in Mn AOS of a given birnessite decreased considerably the capacity for heavy metals, despite the fact that the specific surface area increased almost linearly.

TL;DR: In this article, the adsorption-desorption behavior of phosphate on ferrihydrite, goethite, and hematite and underlying mechanisms were comparatively investigated with batch kinetics, solution equilibrium, and mineral characterization.

TL;DR: In this article, the PZC values of three synthetic Mn oxides (birnessite, cryptomelane, and todorokite) were determined by using three classical techniques (potentiometric titration or PT, rapid PT or R-PT, and salt titration method with a prolonged equilibration time [PST]).

TL;DR: The EXAFS results at high Pb loading testified that Pb was bound in bidentate complexes of one carboxylic and one phenolic group (salicylate- type) or two phenolic groups (catechol-type) in ortho position.