the role of mineral dissolution in the adsorption of

Transformation of siderite to goethite by humic acid in ...

Mar 25, 2020· There is a competitive adsorption relationship between HA and phosphate, but in this study, HA can induce mineral transformation, and the phosphate adsorption may …

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"The Impact of Small Organic Acids on Iron and Manganese ...

Iron and manganese oxides are ubiquitous in soils and sediments and play a critical role in the geochemical distribution of trace elements and heavy metals through adsorption and coprecipitation. At redox interfaces, biogeochemical processes generate conditions with coexisting dissolved Fe(II) and solid-phase Fe(III). In such systems, Fe(II) induces the recrystallization of iron oxides through ...

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Phosphate and phytate adsorption and precipitation on ...

@article{osti_1416015, title = {Phosphate and phytate adsorption and precipitation on ferrihydrite surfaces}, author = {Wang, Xiaoming and Hu, Yongfeng and Tang, Yadong and Yang, Peng and Feng, Xionghan and Xu, Wenqian and Zhu, Mengqiang}, abstractNote = {Phosphorous (P) sorption on mineral surfaces largely controls P mobility and bioavailability, hence its pollution potential, but the ...

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Atmospheric Chemistry Special Feature: Simulated ...

Apr 13, 2010· Role of Particle Size in the Dissolution of α-FeOOH at pH 2 Under Light and Dark Conditions. In natural systems, nanoscale-sized iron oxide and iron oxyhydroxides particles are of great interest because they are produced in the environment and may exhibit dissolution properties that differ from larger-sized particles ().Here, the dissolution of α-FeOOH was investigated in terms of total iron ...

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Role of Conduction/Valence Bands and Redox Potential in ...

The Role of Conduction/Valence Bands and Redox Potential in Accelerated Mineral Dissolution The dissolution kinetics of a number of manganese oxides in acidic solutions were studied.Using a slurry reactor, rate laws were deter- mined for each of the manganese oxides in the hydrohalogen acids.Sig-

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Adsorption of Organic Matter at Mineral/Water Interfaces ...

The effects of the adsorption of pyromellitate, an analogue for natural organic matter, on the dissolution behavior of corundum (α-Al2O3) have been examined over a wide range of pyromellitate concentrations (0−2.5 mM) and pH conditions (2−10). The adsorption modes of pyromellitate on corundum have first been examined using in situ attenuated total reflectance Fourier transform …

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Fe isotopic fractionation during mineral dissolution with ...

Fe isotopic fractionation during mineral dissolution with and without bacteria 1. ... the isotopic composition of dissolved Fe can change with time in a mineral dissolution system during formation of a surface leached layer, if there is a kinetic isotope effect when Fe is liberated from the mineral. ... and fractionation during adsorption of ...

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Role of Dissolved Mineral Species in Calcite-Apatite ...

A knowledge of the role of effects and interactions of chemical species is important in developing an understanding of the behavior of mixed minerals and natural ores in beneficiation processes such as flotation and flocculation. In this study the role of such species was examined for the calcite-apatite system by conducting flotation of each mineral in various supernatants prepared by mixing ...

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Surface coverage and its determination: Role of acid-base ...

The role of acid-base interactions in the nonreactive surface treatment of mineral fillers was studied by a dissolution method. The effect of treatment on the surface properties of CaCO 3 covered with stearic acid was determined by ESCA measurements and by the calculation of the basicity of the treated fillers. The dissolution measurements were carried out in twelve different solvents.

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MINERAL-SOLUTION EQUILIBRIA IN SPARINGLY SOLUBLE

enhanced oil recovery. The role that dissolved mineral species play in deter-mining the surface charge generation and thereby adsorption has been dis-cussed by several investigators [4-8, 18, 19]. An understanding of the influence of the factors discussed above on the solubility and hence the chemical equilibria in heterogeneous mineral/aque-

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Coupled Kinetics Model for Microbially Mediated Arsenic ...

Aug 06, 2019· 1. Environ Sci Technol. 2019 Aug 6;53(15):8892-8902. doi: 10.1021/acs.est.9b00109. Epub 2019 Jun 27. Coupled Kinetics Model for Microbially Mediated Arsenic Reduction and Adsorption/Desorption on Iron Oxides: Role of Arsenic Desorption Induced by Microbes.

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Formation of crystalline Zn-Al layered double hydroxide ...

Nov 06, 2012· To better understand the sequestration of toxic metals such as nickel (Ni), zinc (Zn), and cobalt (Co) as layered double hydroxide (LDH) phases in soils, we systematically examined the presence of Al and the role of mineral dissolution during Zn sorption/precipitation on γ-Al(2)O(3) (γ-alumina) at pH 7.5 using extended X-ray absorption fine ...

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THE ROLE OF MICROORGANISMS

adsorption or release of metals, and ... play an important role in mineral leaching, T. ferrooxidans has often been used as a model bacterium for studying iron oxidation (8). It is ... mineral dissolution increases with increasing mineral surface area and decreasing pH (13).

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The role of mineral dissolution in the adsorption of ...

The role of mineral dissolution in the adsorption of dodecylbenzenesulfonate on kaolinite and alumina. ... Precipitation of dodecylbenzenesulfonate with these dissolved mineral species results in an adsorption maximum in sulfonate micellar solutions. A minimum in residual aluminum concentrations is observed and this coincides with the ...

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Evaluating the role of re-adsorption of dissolved Hg2 ...

@article{osti_1327774, title = {Evaluating the role of re-adsorption of dissolved Hg2+ during cinnabar dissolution using isotope tracer technique}, author = {Jiang, Ping and Li, Yanbin and Liu, Guangliang and Yang, Guidi and Lagos, Leonel and Yin, Yongguang and Gu, Baohua and Jiang, Guibin and Cai, Yong}, abstractNote = {Cinnabar dissolution is an important factor controlling mercury (Hg) cycling.

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Role of surface speciation in the low-temperature ...

Surface species control the mechanism and rate of low-temperature silicate dissolution and precipitation reactions in dilute solutions. This has been repeatedly emphasized 1-7 . The interaction between dissolved species and silicate surfaces involves exchange and adsorption phenomena, which equilibrate rapidly, and are accessible to determination by surface titration8,9.

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Roles of Siderophores, Oxalate, and Ascorbate in ...

In aerobic, circumneutral environments, the essential element Fe occurs primarily in scarcely soluble mineral forms. We examined the independent and combined effects of a siderophore, a reductant (ascorbate), and a low-molecular-weight carboxylic acid (oxalate) on acquisition of Fe from the mineral hematite (α-Fe2O3) by the obligate aerobe Pseudomonas mendocina ymp.

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Kinetics of lead(IV) oxide (PbO2) reductive dissolution ...

Lead(IV) oxide (PbO 2) is a corrosion product on lead pipes used for drinking water distribution, and its dissolution can control lead release to drinking water.This study evaluated the adsorption of Pb(II) to PbO 2 and its impact on the dissolution rate of PbO 2.The dissolution rate of PbO 2 was determined as a function of pH in the absence and presence of free chlorine using continuously ...

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Role of microbial iron reduction in the dissolution of ...

Role of microbial iron reduction in the dissolution of iron hydroxysulfate minerals Elizabeth J. P. Jones,1 Tracie-Lynn Nadeau,2 Mary A. Voytek,1 and Edward R. Landa1 Received 12 August 2005; revised 30 November 2005; accepted 23 December 2005; published 28 March 2006.

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Role of mineral genesis, dissolution, and sorption on ...

Role of mineral genesis, dissolution, and sorption on arsenic fate in contaminated waste sites (2010-2015) Project Leader(s): ... Their projects study how mineral genesis and dissolution impacts arsenic mobility. Arsenic's association with natural and engineered mineral phases controls its aqueous concentration. ... (e.g., adsorption ...

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Role of microbial iron reduction in the dissolution of ...

Mar 28, 2006· 1. Introduction [2] The formation and dissolution of iron‐hydroxysulfate minerals such as jarosite and schwertmannite can influence the mobility of metals and radionuclides in the environment. Jarosite can incorporate lead, mercury, copper, zinc, silver, and radium by substitution for structural K +1 or Fe +3, and anions such as chromate, arsenate, and selenate by substitution for SO 4 −2 ...

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Effect of Salinity on Silica Nanoparticle Adsorption ...

The nanoparticle adsorption mechanisms and the effects on calcite dissolution are addressed. It was shown that nanoparticle adsorption was best described with the second-order-kinetic model and that silica nanoparticle adsorption reduced calcite dissolution.

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The effect of bacterial cell wall adsorption on mineral ...

The effect of bacterial cell wall adsorption on mineral solubilities Article in Geochmica et Cosmochimica Acta 212(3):247-254 · December 2004 with 16 Reads How we measure 'reads'

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Developing a molecular picture of soil organic matter ...

Aug 30, 2017· Additionally, the contribution of reactive mineral surfaces is often simplified by considering Langmuir adsorption kinetics, which may not provide an accurate view of mineral-bound C …

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Effects of Bacillus subtilis endospore surface reactivity ...

Primary mineral dissolution products, such as silica (Si), calcium (Ca) and magnesium (Mg), play an important role in numerous biologic and geochemical cycles including microbial metabolism, plant growth and secondary mineral precipitation. The flux of these and other dissolution products into the environment is largely controlled by the rate of primary silicate mineral dissolution.

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The Role of Mineral Dissolution in the Adsorption of ...

The Role of Mineral Dissolution in the Adsorption of Dodecylbenzenesulfonate on Kaolinite and Alumina PAUL A. SIRACUSA I and P. SOMASUNDARAN2.. 1 Union Carbide Corporation, Technical Center, P.O. Box 8361, S. Charleston, WV 25303 (U.S.A.) 2Henry Krumb School of Mines, Columbia University, New York, NY 10027 (U.S.A.)

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Surface dissolution-assisted mineral flotation: A review ...

The results show that through the surface dissolution the adsorption rate constant for ilmenite increases from 5.272 to 8.441 mol/(g·min) while it decreases for Ol-Px, Tr-Cch and quartz from 6 ...

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Formation of Crystalline Zn–Al Layered Double Hydroxide ...

To better understand the sequestration of toxic metals such as nickel (Ni), zinc (Zn), and cobalt (Co) as layered double hydroxide (LDH) phases in soils, we systematically examined the presence of Al and the role of mineral dissolution during Zn sorption/precipitation on γ-Al2O3 (γ-alumina) at pH 7.5 using extended X-ray absorption fine structure spectroscopy (EXAFS), high-resolution ...

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