Kinetics and Products of Chromium(VI) Reduction by Iron(II/III)-Bearing Clay Minerals

Claresta Joe-Wong; Gordon E. Brown; Kate Maher

doi:10.1021/acs.est.7b02934

Kinetics and Products of Chromium(VI) Reduction by Iron(II/III)-Bearing Clay Minerals

Environmental Science & Technology ◽

10.1021/acs.est.7b02934 ◽

2017 ◽

Vol 51 (17) ◽

pp. 9817-9825 ◽

Cited By ~ 38

Author(s):

Claresta Joe-Wong ◽

Gordon E. Brown ◽

Kate Maher

Keyword(s):

Clay Minerals ◽

Chromium Vi

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Clay Minerals Functionalized by Magnetite (Fe3O4) Nanoparticles as Solid Platform for Removal of Chromium (VI) from Water: Characterization, Kinetics, Thermodynamics, Analytical Utility and Reusability Studies

Analytical Chemistry Letters ◽

10.1080/22297928.2020.1861974 ◽

2020 ◽

Vol 10 (5) ◽

pp. 636-653

Author(s):

H.M Harbi ◽

A.H Al-Baqawi ◽

M.S El-Shahawi

Keyword(s):

Clay Minerals ◽

Fe3o4 Nanoparticles ◽

Chromium Vi ◽

Magnetite Fe3o4 ◽

Analytical Utility

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Chromium isotope fractionation during reduction of Chromium(VI) by Iron(II/III)-bearing clay minerals

Geochimica et Cosmochimica Acta ◽

10.1016/j.gca.2020.09.034 ◽

2021 ◽

Vol 292 ◽

pp. 235-253

Author(s):

Claresta Joe-Wong ◽

Karrie L. Weaver ◽

Shaun T. Brown ◽

Kate Maher

Keyword(s):

Clay Minerals ◽

Isotope Fractionation ◽

Chromium Vi

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Manganese(II)-Catalyzed and Clay-Minerals-Mediated Reduction of Chromium(VI) by Citrate

Environmental Science & Technology ◽

10.1021/es401568k ◽

2013 ◽

Vol 47 (23) ◽

pp. 13629-13636 ◽

Cited By ~ 48

Author(s):

Binoy Sarkar ◽

Ravi Naidu ◽

Gummuluru SR Krishnamurti ◽

Mallavarapu Megharaj

Keyword(s):

Clay Minerals ◽

Chromium Vi ◽

Mediated Reduction

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Understanding the role of clay minerals in the chromium(VI) bioremoval by Pseudomonas aeruginosa CCTCC AB93066 under growth condition: microscopic, spectroscopic and kinetic analysis

World Journal of Microbiology and Biotechnology ◽

10.1007/s11274-015-1928-9 ◽

2015 ◽

Vol 31 (11) ◽

pp. 1765-1779 ◽

Cited By ~ 14

Author(s):

Chunxi Kang ◽

Pingxiao Wu ◽

Yuewu Li ◽

Bo Ruan ◽

Liping Li ◽

...

Keyword(s):

Pseudomonas Aeruginosa ◽

Kinetic Analysis ◽

Clay Minerals ◽

Growth Condition ◽

Chromium Vi

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Kinetics and Products of Chromium(VI) Reduction by Iron(II/III)-Bearing Clay Minerals

10.31223/osf.io/36bhk ◽

2020 ◽

Author(s):

Claresta Joe-Wong ◽

Kate Maher ◽

Gordon Brown

Keyword(s):

Clay Minerals ◽

Chromium Vi

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Hydrated form of some clay minerals observed using a film sealed environmental cell

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100107502 ◽

1978 ◽

Vol 36 (1) ◽

pp. 72-73

Author(s):

N. Kohyama ◽

K. Fukushima ◽

A. Fukami

Keyword(s):

Clay Minerals ◽

Morphological Changes ◽

Carbon Film ◽

Electron Microscopic Observation ◽

Adsorbed Water ◽

Electron Microscopic ◽

Hydrated Form ◽

Thin Carbon ◽

Environmental Cell ◽

Thin Carbon Film

Since the interlayer or adsorbed water of some clay minerals are quite easily dehydrated in dried air, in vacuum, or at moderate temperatures even in the atmosphere, the hydrated forms have not been observed by a conventional electron microscope(TEM). Recently, specific specimen chambers, “environmental cells(E.C.),” have been developed and confirmed to be effective for electron microscopic observation of wet specimen without dehydration. we observed hydrated forms of some clay minerals and their morphological changes by dehydration using a TEM equipped with an E.C..The E.C., equipped with a single hole copper-microgrid sealed by thin carbon-film, attaches to a TEM(JEM 7A) with an accelerating voltage 100KV and both gas pressure (from 760 Torr to vacuum) and relative humidity can be controlled. The samples collected from various localities in Japan were; tubular halloysite (l0Å) from Gumma Prefecture, sperical halloysite (l0Å) from Tochigi Pref., and intermediate halloysite containing both tubular and spherical types from Fukushima Pref..

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Colloidal systems in soils

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100168050 ◽

1994 ◽

Vol 52 ◽

pp. 64-65

Author(s):

J. Thieme ◽

J. Niemeyer ◽

P. Guttman

Keyword(s):

Clay Minerals ◽

Polymeric Materials ◽

Spatial Arrangement ◽

High Specific Surface Area ◽

Turnover Rates ◽

Colloidal Systems ◽

Chemical Conditions ◽

Aggregation Phenomena ◽

Iron And Manganese ◽

Soil Colloids

In soil science the fraction of colloids in soils is understood as particles with diameters smaller than 2μm. Clay minerals, aquoxides of iron and manganese, humic substances, and other polymeric materials are found in this fraction. The spatial arrangement (microstructure) is controlled by the substantial structure of the colloids, by the chemical composition of the soil solution, and by thesoil biota. This microstructure determines among other things the diffusive mass flow within the soils and as a result the availability of substances for chemical and microbiological reactions. The turnover of nutrients, the adsorption of toxicants and the weathering of soil clay minerals are examples of these surface mediated reactions. Due to their high specific surface area, the soil colloids are the most reactive species in this respect. Under the chemical conditions in soils, these minerals are associated in larger aggregates. The accessibility of reactive sites for these reactions on the surface of the colloids is reduced by this aggregation. To determine the turnover rates of chemicals within these aggregates it is highly desirable to visualize directly these aggregation phenomena.

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