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FeIIFeIII layered double hydroxide modified carbon felt cathode for removal of ciprofloxacin in electro-Fenton process

The disadvantages of limited working pH range and poor stability have hindered the practical application of traditional electro-Fenton process. In this research, a novel heterogeneous electro-Fenton (HEF) process with FeIIFeIII layered double hydroxide/carbon felt (FeIIFeIII LDH/CF) as cathode was developed for the rapid destruction of ciprofloxacin (CIP) in bulk solution. Effects of crucial influencing factors (initial pH, current intensity) on CIP degradation were investigated. Results indicated that FeIIFeIII LDH/CF cathode was efficient for CIP degradation (88.11%). Furthermore, CIP degradation performance in HEF could remain stable over wide range of pH (pH 3?9). The catalytic degradation of CIP in HEF process might be a combined effect of homogeneous EF reaction, anodic oxidation, and surface catalysis process via ?FeII/?FeIII cycle. Possible degradation pathways were proposed. The results suggested that FeIIFeIII LDH/CF cathode showed great application potential for CIP degradation.

» Author: Bin Yao, Zirui Luo, Jian Yang, Dan Zhi, Yaoyu Zhou

» Publication Date: 01/06/2021

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