THE MECHANISM(S)OF NOMETALIC MINERAL REMEDYING ENVIRONMENTS
Received date: 1998-11-02
Revised date: 1999-02-08
Online published: 1999-10-01
The data and information have showed that nometalic minerals including primary and secondary silicates and apatites can absorb heavy elements, REE, organic materials, and some bacteria.These minerals can remedy environment efficially, which have been polluted both in waters and in soils.This article showed the mechanisms as follow: (1)Experiments have showed that when some heavy elements are high in environment, after adding bentonites heavy metal elements can exchange Ca2+and Na+from bentonites, according to the lowest energy law and matter conversation principle. A typical mechanism is like (Cu, Pb, Cd, Hg, Cr)(2～3)++(Ca2+, Na+)-bentonite=(Ca2+,Na+)+(Cu, Pb, Zn,Cd, Hg, Cr) -bentonite. So heavy metal elements are removed from environments. (2)Besides absorbing on the surface, some elements such as Cr3+can enter layers of bentonites and complex with oxygen of silicate radics there, which have been confirmed by different parameters. (3)To remove much more environmental organic components TMA+and TMPA+are often added into bentonite and organic clay minerals are formed. These types of clays can remove aroma and adipose efficiently. The rate of removing organic matter depends on the mineral structures. (4)Apatites can release different carbonate ions in different pH. These ions combine with Pb, Cu, Zn, Cd and pricipitate from the solutions, especialy in mining and metallurgy districts.(5)When H2O2contacts with surfaces of nometalic minerals, the free radicals (OH·) produce, in the catalysis of Fe2+or Fe2O3. The surfaces after oxidizing by OH·oxidized
phneols, aldehydes,and polychlorinebenzene easier. So rigid elements are removed. Although the five mechanisms are proposed here, some are to be further studied now. In environments when polluted elements are removed, several mechanisms are acted at the same time.
Key words： Natural nometalic minerals; Environment; Remedying mechanisms.
SUN Shenglong, LONG Zhenyong, CAI Baofeng . THE MECHANISM(S)OF NOMETALIC MINERAL REMEDYING ENVIRONMENTS[J]. Advances in Earth Science, 1999 , 14(5) : 475 -481 . DOI: 10.11867/j.issn.1001-8166.1999.05.0475
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