負載型奈米貴金屬對含氯有機物的脫氯反應(2/2)
Date Issued
2004-07-31
Date
2004-07-31
Author(s)
DOI
922211E002063
Abstract
Nanoscale zerovalent copper supported on a cation resin was successfully
synthesized to enhance the removal of carbon tetrachloride (CCl4) from contaminated
water. The use of the cation resin as a support prevents the reduction of surface area
due to agglomeration of nanoscale zero valent copper particles. Moreover, the cation
resin recycles the copper ions resulting from the reaction between CCl4 and Cu0 by
simultaneous ion exchange. The decline in the amount of CCl4 in aqueous solution
results from the combined effects of degradation by nanoscale zero valent copper and
sorption by the cation resin; thus the amount of CCl4 both in aqueous solution and
sorbed onto the resin were measured. The pseudo-first-order rate constant normalized
by the surface-area and the mass concentration of nanoscale zero valent copper (kSA)
was 2.1 0.1 L h ± 2 10− × -1 m-2, approximately twenty times that of commercial
powdered zero valent copper (0.04 mm). Due to the exchange between Cu2+ and the
strongly acidic ions (H+ or Na+), the pH was between 3 and 4 in unbuffered solution
and Cu2+ at the concentration of less than 0.1 mg L-1 was measured after the
dechlorination reaction. In the above-ground application, resin as a support would
facilitate the development of a process that could be designed for convenient
emplacement and regeneration of porous reductive medium.
Subjects
nanoscale
zerovalent metal
copper
dechlorination
carbon
tetrachloride
tetrachloride
Publisher
臺北市：國立臺灣大學環境工程學研究所
Type
report
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