期刊
CHEMOSPHERE
卷 146, 期 -, 页码 308-314出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2015.12.047
关键词
Iron metal matrix composite; Dechlorination; 2-Chlorophenol; Ball milling; Quartz sand; Iron-carbon
资金
- National High-Tech Research and Development Program of China [2013AA06A305]
- National Natural Science Foundation of China [21177089, 21547011, 41172210, 51108330]
- State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRY11005]
- National Science and Technology Support Program [2013BAC01B01]
In this work, we tested a novel iron metal matrix composite (MMC) synthesized by mechanically introducing quartz sand (SiO2) into an iron matrix (denoted as SiO2-Fe MMC). The pseudo-first-order reaction rate constant of the SiO2 Fe MMC (initial pH 5.0) for 20 mg/L of 2-chlorophenol (2-CP) was 0.051 x 10(-3) L/m(2)/min, which was even higher than that of some reported Pd/Fe bimetals. This extraordinary high activity was promoted by the quick iron dissolution rate, which was caused by the formation of Fe-C internal electrolysis from carbonization of process control agent (PCA) and the active reinforcement/metal interfaces during the milling process. In addition, pH has slight effect on the dechlorination rate. The SiO2 Fe MMC retained relatively stable activity, still achieving 71% removal efficiency for 2-CP after six consecutive cycles. The decrease in dechlorination efficiency can be attributed to the rapid consumption of Fe. A dechlorination mechanism using the SiO2 Fe MMC was proposed by a direct electron transfer from Fe to 2-CP at the quartz sand/iron interface. (C) 2015 Elsevier Ltd. All rights reserved.
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