Citation: Zhu Wang, Shuangqiu Huang, Danni Guo, Wenhao Lao, Yiping Feng, Tong Li, Zhao-Qing Liu, Chun Hu. Reductive sequestration of Cr(Ⅵ) from water by an all-in-one polypyrrole/NiFe-layered double hydroxide filter[J]. Chinese Chemical Letters, ;2025, 36(12): 111090. doi: 10.1016/j.cclet.2025.111090 shu

Reductive sequestration of Cr(Ⅵ) from water by an all-in-one polypyrrole/NiFe-layered double hydroxide filter

Zhu Wang ^a ,
Shuangqiu Huang ^a ,
Danni Guo ^a ,
Wenhao Lao ^b ,
Yiping Feng ^{b, *,} ,
Tong Li ^{a, c, *,} ,
Zhao-Qing Liu ^d ,
Chun Hu ^a

a.
Institute of Environmental Research at Greater Bay, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China
b.
Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
c.
Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
d.
School of Chemistry and Chemical Engineering/Institute of Clean Energy and Materials/Guangzhou Key Laboratory for Clean Energy and Materials, Guangzhou University, Guangzhou 510006, China

ypfeng@gdut.edu.cn

litong619@ustb.edu.cn

Received Date: 11 October 2024
Revised Date: 5 February 2025
Accepted Date: 13 March 2025
Available Online: 13 March 2025

Figures(4)

Reducing the highly toxic Cr(Ⅵ) to safe levels is a critical challenge in water treatment, essential for protecting both ecosystems and human health. In this study, we present a facile in situ polymerization approach to prepare polypyrrole-coated layered double hydroxide composites (PPy/NiFe LDHs). Compared with other LDHs and polypyrrole-based materials, the synthesized PPy/LDHs exhibit excellent adsorption performance under mildly acidic conditions, achieving a maximum Cr(Ⅵ) adsorption capacity of 440.4 mg/g at pH 5. Notably, PPy/LDH effectively reduces Cr(Ⅵ) concentration from 10 mg/L to 0.028 mg/L, well below the maximum permissible level of 0.05 mg/L for drinking water. Additionally, PPy/LDH demonstrates durable stability; at pH 5, nickel and iron ions are not detected after adsorption, and trivalent chromium remains fixed on the material without re-release into the solution following reduction. The adsorption behavior and mechanistic analysis indicate that a combination of adsorption and reduction drives Cr(Ⅵ) removal by PPy/LDHs. This work offers an innovative approach to effectively remove the low concentrations of Cr(Ⅵ) from water, showing significant potential for efficient Cr(Ⅵ) remediation.
- Layered double hydroxide,
- Polypyrrole,
- Hexavalent chromium,
- Reductive sequestration,
- Adsorption mechanism
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