Synthesis of nanoscale reaction pits network on zerovalent iron powder surface |
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Authors: | Chun-man Li Kong-hwa Chiu |
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Affiliation: | a Green Chemistry Lab, Department of Chemistry, Chung Yuan Christian University, 200, Jhong Bei Road, Chung-Li 32023, Taiwan, ROC b Department of Natural Sciences, National Science Council, Taiwan, ROC |
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Abstract: | A neat and efficient method for controllable and reproducible synthesis of coral-shaped matrix containing abundant nanoscale reaction pits on micrometer-size zerovalent iron powder is described with the study of etching capability of dilute hydrochloric, sulfuric, and nitric acids with concentration ranges from 1 N to 6 N. Characterizations of surface morphology show that the specific surface area of this matrix increases up to 170 times that of the untreated iron powder, and that the reduction efficiency of a PCB congener in subcritical water is enhanced fivefold from 18% for the untreated iron to 92% for that with 170 times its surface area. The nanoscale pits may be a basis for enhancement of reaction cross-section via restriction of molecule mobility in the pits. |
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Keywords: | Zerovalent iron powder surface Hydrodechlorination of PCB Subcritical water Reductive dechlorination Nanoscale reaction sites Chloride-induced pitting |
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