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Application of nano‐scale zero‐valent iron adsorbed on magnetite nanoparticles for removal of carbon tetrachloride: Products and degradation pathway
Author(s) -
Lv Xiaofan,
Prastistho Widyawanto,
Yang Qi,
Tokoro Chiharu
Publication year - 2020
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.5592
Subject(s) - zerovalent iron , chemistry , ferrous , magnetite , adsorption , carbon tetrachloride , ferric , degradation (telecommunications) , catalysis , carbon fibers , inorganic chemistry , nanoparticle , chloroform , reductive dechlorination , nuclear chemistry , composite number , chemical engineering , metallurgy , biodegradation , organic chemistry , materials science , telecommunications , computer science , engineering , composite material
Nano‐scale zero‐valent iron (nZVI) attached to Fe 3 O 4 nanoparticles (Fe 0 @Fe 3 O 4 ), which has better dispersibility and a larger specific surface area than the nanoparticles alone, were prepared and applied to the reductive dechlorination of carbon tetrachloride (CT). CT removal efficiencies by Fe 0 @Fe 3 O 4 composites with different ratios of the two components were compared. Under optimum conditions, when the Fe 0 /Fe 3 O 4 ratio was 1:2, almost no CT was detected after 50 min and it took only about 30 min to reach a removal efficiency of 90%, compared with 120 min for an Fe 0 /Fe 3 O 4 ratio of 1:4. An increase in the amount of nZVI in the catalyst effectively improved the removal of CT and accelerated the reaction rate. Chloroform was the main product. Compared with Fe 3 O 4 alone, a significant increase in the solution concentrations of ferrous and ferric ions occurred in the Fe 0 @Fe 3 O 4 system: both Fe 2+ and Fe 3+ reached their maximum concentrations at 60 min and then tended to decline over the next 60 min. The increase in Fe 2+ concentration was attributed to the reaction between nZVI and CT, which produces ferrous ions when electrons transfer from Fe 0 to organic chlorides. Synergistic effects between the composite constituents promoted the relative rates of mass transfer to reactive sites and Fe 2+ generated in solution facilitated the reduction of chlorinated organic pollutants by magnetite. Thus, Fe 0 @Fe 3 O 4 nanoparticles effectively achieved reductive dechlorination of CT and provide an improved nZVI catalyst for the remediation of chlorinated organic compounds.