Removal of Aqueous Hexavalent Chromium by Nano Copper-Resin
Date Issued
2011
Date
2011
Author(s)
Peng, Shih-Hao
Abstract
The objective of this research is to use nanoscale zero valent copper supported on cation exchange resin (nano copper-resin) to reduce hexavalent chromium to trivalent chromium. Using cation exchange resin as the agent of dispersion could disperse nanoscale zero valent copper. In addition, cation resin could recycle divalent copper (Cu2+) and trivalent chromium (Cr3+).
There are three major parts in the experiment part. First one is the fabrication of nanoscale copper-resin, second one is nanoscale copper-resin surface analysis, and last one is batch experiment of hexavalent chromium reduction .
The characterizations of nanoscale copper-resin surface were investigated by SEM and AAS. The effect of specific surface area of nanoscale copper-resin on reduction of hexavalent chromium were investigated and discussed.
Different copper/resin ratios have different specific area and ability to reduce hexavalent chromium. Six Different copper/resin ratios,45, 35, 25, 15, 5, and 1 mg-copper/g-resin was investigated in this study. In each batch experiment, 2 g nanoscale copper-resin were added in 230 mL solution containing 20 mg-Cr(VI)/L. Nanoscale copper-resin in 25 mg-copper/g-resin is the best one to reduce hexavalent chromium. The efficiency for reducing is around 100% in 25 mg-copper/g-resin nanoscale copper-resin after 24 hours. The removal efficiency when pH is at 3 is better than when pH is at 5 and 7.
The used nano copper-resin can be regenerated by the reduce process. The regenerated nano copper-resin still had good performance in removal total chromium and hexavalent chromium. Furthermore, had good performance in recycling divalent copper ion and trivalent chromium ion.
Subjects
hexavalent chromium
nanoscale zero valent metal
ion-cexchange resin
Type
thesis
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