Adsorption, desorption, and precipitation reactions at environmental interfaces govern the fate of phosphorus in terrestrial and aquatic environments. Typically, a substantial part of the total pool of phosphorus consists of organophosphate, and in this study we have focused on the interactions between glucose-1-phosphate (G1P) and goethite (α-FeOOH) particles. The adsorption and surface-promot...

Arsenic has been classified as a toxic and carcinogenic chemical element. It therefore presents a serious environmental problem in different regions of the country and the world. In the present work, two adsorbent media were developed and evaluated to remove arsenic from water in the Pájaro Verde mine shaft, Huautla, Tlaquiltenango, Morelos. The media were synthesized and characterized, obtaini...

10 Heterogeneous photodegradation of pentachlorophenol (PCP) in the goethite 11 (α-FeOOH) and hematite (α-Fe2O3) systems with oxalate under UVA illumination was 12 investigated. The PCP degradation, dechlorination and detoxification, in terms of 13 Microtox acute toxicity, were achieved to the higher efficiency in the hematite 14 suspension than in the goethite suspension. The optimal initial c...

Microbial extraction of nickel from lateritic chromite overburden (COB), Sukinda by Acidithiobacillus ferrooxidans has been investigated in this work. In anoxic environment, A. ferrooxidans reduced the ferric iron in goethite [Fe(O)OH] mineral of COB by using elemental sulphur as electron donor. Nickel embedded in the complex goethite matrix of COB was successfully recovered by cumulative actio...

The uptake of Cu by particles of goethite to which humic substances (HS) were adsorbed was measured as a function of pH at fixed Cu concentration, and as a function of [Cu] at pH 5.5, at an ionic strength of 0.01 mol dm-3• Uptake was enhanced, compared to that by goethite alone, in the pH range 4-7 and at [Cuz+] ::::; 10-5 mol dm-3• The results at pH 5.5 show that the enhancement is not due sim...

[1] The ‘‘hard’’ isothermal remanent magnetization (HIRM) and the S-ratio are widely used in environmental magnetism to quantify the absolute and relative concentrations, respectively, of antiferromagnetic minerals (hematite and goethite) in mineral mixtures. We demonstrate that synthetic Al-substituted hematite and goethite exhibit a wide range of coercivities, which significantly influences t...

The speciation and fate of neptunium as Np(V)O2(+) during the crystallization of ferrihydrite to hematite and goethite was explored in a range of systems. Adsorption of NpO2(+) to iron(III) (oxyhydr)oxide phases was reversible and, for ferrihydrite, occurred through the formation of mononuclear bidentate surface complexes. By contrast, chemical extractions and X-ray absorption spectroscopy (XAS...

The formation of a bond between a bacterium and a mineral is ultimately controlled by forces that operate over length scales of a few nanometers. This manuscript presents evidence that bacteria may actively modulate forces at the cell-mineral interface to promote contact with specific mineral phases. Nanoto pico-Newton forces were measured between goethite (FeOOH) and each of two species of Gra...