以電化學技術探討零價金屬去除Cr(VI)之反應研究
Date Issued
2005-07-31
Date
2005-07-31
Author(s)
DOI
932211E002035
Abstract
Chromium is a common pollutant in
groundwater in industrial region because it is
a raw material which is often used by many
industries. The potential for using zero valent
iron to treat chromium pollution in situ has
been concerned in recent years. The surface
area and the passivity of the passive film on
the iron surface are very important factors for
chromium removal by zero valent iron. The
surface area for nanolized iron is much larger
and the passive film for nanolized iron is
much thinner than that for commercial
powder iron. Therefore, the chromium
removal rate in nanolized iron system should
be much higher than that in commercial
powder iron system. The efficiencies ofchromium removal in nanolized iron and
commercial powder iron (J.T. Baker)
systems were compared in this work. The
results show that the existence of chloride
and sulfate ions can increase the rate of
chromium removal by zero valent iron in
commercial powder iron system. Otherwise
existence of the phosphate, perchloride and
nitrate ions can reduce the rate of chromium
removal by zero valent iron in commercial
powder iron system. However, in nanolized
iron system, the influences of chloride,
sulfate, nitrate and perchloride ions on
chromium removal rate were very relatively
insignificant. But the existence of phosphate
ion can still decrease the chromium removal
rate. This above phenomenon and the results
of electrochemical analysis indicated the
destruction of passive film is the ratedetermining
step for chromium removal by
zero valent iron in commercial powder iron
system but is not in nanolized iron system.
Subjects
chromium
commercial powder
iron
iron
nanolized iron
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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