首页|Enhanced catalytic activation of H2O2 by CNTs/SCH through rapid Fe(III)/Fe(II) redox couple circulation;; Insights into the role of fiinctionalized multiwalled CNTs
Enhanced catalytic activation of H2O2 by CNTs/SCH through rapid Fe(III)/Fe(II) redox couple circulation;; Insights into the role of fiinctionalized multiwalled CNTs
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NSTL
How to achieve the efficient generation of Fe(II) from Fe(III) in Fenton reaction is a significant issue. In this work, a novel composite of oxidized multiwalled carbon nanotubes-Schwertmannite (CNTs-SCH) were successfully synthesized through a coprecipitation and hydrothermal strategy. The results indicated that the prepared 15%CNTs-SCH would exhibit an excellent catalytic performance in activation of hydrogen peroxide for degradation of tetracycline. The Fe(III)/Fe(II) redox couple circulation would be greatly enhanced from dynamic and thermodynamic aspects. The sulfate radicals generating from SO42" on the surface of Schwertmannite would contribute to TC degradation, which was in line with the enhanced generation rate of Fe(II) and hydroxyl radical in the 15%CNTs-SCH system. In addition, C = C and C = O (in CNTs) were acting as key active sites in prompting formation of Fe(II) and hydroxyl radical. What's more, the effects of pH, CNTs-SCH, hydrogen peroxide dosages, and common anions on TC removal were assessed. This investigation showed that the prepared 15%CNTs-SCH was an effective catalyst for hydrogen peroxide activation in the heterogeneous system with a wide pH range and good recyclability, confirming its stronger potential practical application.
NSTL
