Hierarchically porous BiOCl@NiCo 2 O 4 nanoplates as low-cost and highly efficient catalysts for the discoloration of organic contaminants in aqueous media

The construction of noble metal-free materials with remarkable activity and high stability via a simple, green, efficient, and low-cost method remains a crucial task for addressing the problem of water contamination. Herein, ultrathin NiCo 2 O 4 nanosheets were in situ assembled on the surface of Bi...

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Veröffentlicht in:New journal of chemistry 2020, Vol.44 (1), p.258-264
Hauptverfasser: Zhi, Lihua, Xu, Youyuan, Zhang, Shengya, Hu, Dongcheng, Liu, Jiacheng
Format: Artikel
Sprache:eng
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Zusammenfassung:The construction of noble metal-free materials with remarkable activity and high stability via a simple, green, efficient, and low-cost method remains a crucial task for addressing the problem of water contamination. Herein, ultrathin NiCo 2 O 4 nanosheets were in situ assembled on the surface of BiOCl single-crystal nanosheets with a vertical orientation to form a well-defined hierarchically porous structure. Notably, the obtained BiOCl@NiCo 2 O 4 nanoplates displayed outstanding catalytic activity in the reductive conversion of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). On account of their special morphology, plentiful porosity, and good stability, the as-prepared composite could finish the reduction reaction within 280 s with a large rate constant ( k app ) of 7.18 × 10 −3 s −1 . The BiOCl@NiCo 2 O 4 nanoplates possessed excellent recyclability, and the original activity could be maintained even after seven consecutive cycles. Furthermore, the resultant BiOCl@NiCo 2 O 4 could also act as a hyperactive catalyst for the reductive discoloration of organic dyes (rhodamine B, rhodamine 6G, Congo red, and methyl orange). Our strategy, therefore, promotes the development of low-cost and high-performance noble metal-free catalysts to treat water pollution.
ISSN:1144-0546
1369-9261
DOI:10.1039/C9NJ05100G