Degradation of ciprofloxacin by persulfate activation with CuO supported on Mg Al layered double hydroxide

CuO is an efficient catalyst for persulfate (PS) activation. However, the leaching of Cu ions is usually serious and the improvement of CuO stability is highly desired for its practical application. Herein, CuO supported on Mg Al layered double hydroxide (LDH) and CuO-LDH composite were synthesized...

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Published inJournal of environmental chemical engineering Vol. 9; no. 5; p. 106178
Main Authors Zhang, Yaxin, Zhang, Chenhui, Zhou, Zicheng, Wu, Yinsu, Xing, Shengtao
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.10.2021
Subjects
CuO
Mg Al layered double hydroxide
Persulfate activation
Reactive species
Mg Al layered double hydroxide
Persulfate activation
CuO
Reactive species
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Abstract CuO is an efficient catalyst for persulfate (PS) activation. However, the leaching of Cu ions is usually serious and the improvement of CuO stability is highly desired for its practical application. Herein, CuO supported on Mg Al layered double hydroxide (LDH) and CuO-LDH composite were synthesized by two-step precipitation and co-precipitation methods, respectively. The leaching of Cu ions was avoided due to the high alkalinity and buffer capacity of LDH. CuO supported on LDH had larger surface area, higher alkalinity and more exposed CuO, thus exhibiting much higher activity than CuO-LDH composite. The sample with the Cu:Mg ratio of 1:1 (Cu4/LDH) exhibited the highest activity and could remove more than 99% of ciprofloxacin within 30 min at pH 4–10. The removal efficiency was still above 94% in the presence of various coexisting substances. Moreover, it showed good stability and reusability. Activated PS generated via the non-radical pathway and SO4−• generated via the radical pathway were the dominant reactive species for ciprofloxacin degradation. The results indicate that Cu4/LDH is a promising catalyst for the removal of organic pollutants with PS activation. [Display omitted] •CuO supported on LDH shows much higher activity than CuO-LDH composite.•CuO supported on LDH can provide more active sites for persulfate activation.•The leaching of Cu ions was avoided due to the high alkalinity of LDH.•It can effectively degrade ciprofloxacin with persulfate over a wide pH range.•Activated persulfate and SO4−• are the dominant active species.
AbstractList CuO is an efficient catalyst for persulfate (PS) activation. However, the leaching of Cu ions is usually serious and the improvement of CuO stability is highly desired for its practical application. Herein, CuO supported on Mg Al layered double hydroxide (LDH) and CuO-LDH composite were synthesized by two-step precipitation and co-precipitation methods, respectively. The leaching of Cu ions was avoided due to the high alkalinity and buffer capacity of LDH. CuO supported on LDH had larger surface area, higher alkalinity and more exposed CuO, thus exhibiting much higher activity than CuO-LDH composite. The sample with the Cu:Mg ratio of 1:1 (Cu4/LDH) exhibited the highest activity and could remove more than 99% of ciprofloxacin within 30 min at pH 4–10. The removal efficiency was still above 94% in the presence of various coexisting substances. Moreover, it showed good stability and reusability. Activated PS generated via the non-radical pathway and SO4−• generated via the radical pathway were the dominant reactive species for ciprofloxacin degradation. The results indicate that Cu4/LDH is a promising catalyst for the removal of organic pollutants with PS activation. [Display omitted] •CuO supported on LDH shows much higher activity than CuO-LDH composite.•CuO supported on LDH can provide more active sites for persulfate activation.•The leaching of Cu ions was avoided due to the high alkalinity of LDH.•It can effectively degrade ciprofloxacin with persulfate over a wide pH range.•Activated persulfate and SO4−• are the dominant active species.
ArticleNumber 106178
Author Xing, Shengtao
Zhou, Zicheng
Wu, Yinsu
Zhang, Yaxin
Zhang, Chenhui
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Keywords Mg Al layered double hydroxide
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CuO
Reactive species
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Snippet CuO is an efficient catalyst for persulfate (PS) activation. However, the leaching of Cu ions is usually serious and the improvement of CuO stability is highly...
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StartPage 106178
SubjectTerms CuO
Mg Al layered double hydroxide
Persulfate activation
Reactive species
Title Degradation of ciprofloxacin by persulfate activation with CuO supported on Mg Al layered double hydroxide
URI https://dx.doi.org/10.1016/j.jece.2021.106178
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