Abstract
Mg–Al Layered double hydroxides (LDH) with weak alkalinity can improve the activity and stability of transitional metal oxides for peroxydisulfate (PDS) activation. Herein, NiO supported on LDH (Ni-LDH-TP) and Ni doped LDH samples (Ni-LDH-CP and Ni-LDH-SP) were prepared by two-step precipitation and co-precipitation methods, respectively. Their structure and surface properties were characterized and their performance for PDS activation was compared using ciprofloxacin as the target pollutant. The results indicate that Ni-LDH-TP exhibited much higher activity than Ni-LDH-CP and Ni-LDH-SP due to its more surface exposed NiO. The two-step precipitation method should be a better alternative for the synthesis of Ni-LDH catalyst for PDS activation. Ni-LDH-TP exhibited high activity over a wide pH range and good reusability in the presence of bicarbonate, demonstrating its potential application in real water treatment. Activated PDS and SO4•− should be the dominant reactive species for ciprofloxacin degradation. This finding provides an effective strategy for preparing Ni-based PDS catalyst.
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