Arsenate and chromate retention mechanisms on goethite. 1. Surface structure

Article Abstract:

A study aimed at determining the stability and oxyanion sorption mechanisms of arsenic and chromium is presented. Chromate and arsenate are present in the environment in high levels and prove to be very harmful to living organisms. It is deemed important to identify the reactions that will remove these contaminants from the aqueous phase, thereby limiting their mobility and bioavailability. The study utilized extended X-ray absorption fine structure (EXAFS) spectroscopy to deduce the local coordination environment of the two contaminants on the mineral goethite (alpha-FeOOH).

All Other Basic Inorganic Chemical Manufacturing, Analytical Laboratory Instrument Manufacturing, Industrial inorganic chemicals, not elsewhere classified, Analytical instruments, Arsenic & Compounds, Chromium, X-Ray Energy Spectrometers, Methods, Equipment and supplies, Environmental aspects, Extended X-ray absorption fine structure, Chromium (Metal), Arsenic, Spectrometers, Chemical models, X-ray equipment

---

Investigation of Ni sorption on pyrophyllite: an XAFS study

Article Abstract:

The local atomic structure of Ni(II) sorbed into pyrophyllite was studied using X-ray absorption fine structure spectroscopy. It was shown that the first coordination shell featured six O atoms at 2.02-2.04 anstrom. The second shell consisted of a single Ni-Al/Si distance. The number of Ni second-neighbor atoms between 2.99-3.00 angstrom increased along with Ni surface loading on pyrophyllite.

Absorption, Nickel

---

The nature of Zn precipitates formed in the presence of pyrophyllite

Article Abstract:

Researchers from the University of Delaware studied the partitioning of zinc to pyrophyllite as a function of surface loading using x-ray absorption fine structure spectroscopy. Reaction products reveal the formation of a Zn-Al layered hydroxide surface precipitate.

Science & research, Argentina, Zinc, All Other Nonmetallic Mineral Mining, Miscellaneous nonmetallic minerals, Pyrophyllite, Mining industry, Zinc products, Zinc industry, Mineral industry, Silicate minerals, University of Delaware

Similar abstracts:

• Abstracts: Arsenate and chromate retention mechanisms on goethite. 2. Kinetic evaluation using a pressure-jump relaxation technique
• Abstracts: Photodechlorination mechanism of DDT in a UV/surfactant system

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.