Hierarchically porous BiOCl@NiCo2O4 nanoplates as low-cost and highly efficient catalysts for the discoloration of organic contaminants in aqueous media†,New Journal of Chemistry

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Hierarchically porous BiOCl@NiCo2O4 nanoplates as low-cost and highly efficient catalysts for the discoloration of organic contaminants in aqueous media†
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2019-11-20 , DOI: 10.1039/c9nj05100g
Lihua Zhi _{1,

2,

3,

4,

5} , Youyuan Xu _{1,

2,

3,

4,

5} , Shengya Zhang _{1,

2,

3,

4,

5} , Dongcheng Hu _{1,

2,

3,

4,

5} , Jiacheng Liu _{1,

2,

3,

4,

5}

Affiliation

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 NiCo₂O₄ 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@NiCo₂O₄ 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@NiCo₂O₄ nanoplates possessed excellent recyclability, and the original activity could be maintained even after seven consecutive cycles. Furthermore, the resultant BiOCl@NiCo₂O₄ 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.

中文翻译：

分层多孔BiOCl @ NiCo ₂ O ₄纳米板是低成本且高效的催化剂，用于使水性介质中的有机污染物脱色†

通过简单，绿色，高效和低成本的方法来构建具有显着活性和高稳定性的无贵金属材料仍然是解决水污染问题的关键任务。在此，将超薄的NiCo ₂ O ₄纳米片原位组装在具有垂直取向的BiOCl单晶纳米片的表面上，以形成明确定义的分层多孔结构。值得注意的是，获得的BiOCl @ NiCo ₂ O ₄纳米板在将4-硝基苯酚（4-NP）还原为4-氨基苯酚（4-AP）的过程中表现出出色的催化活性。由于其特殊的形貌，丰富的孔隙率和良好的稳定性，所制备的复合材料可以在280 s内完成还原反应，并具有7.18×10 ^-3 s ^-1的大速率常数（k _app）。BiOCl @ NiCo ₂ O ₄纳米板具有出色的可回收性，即使连续七个循环也可以保持原始活性。此外，所得的BiOCl @ NiCo ₂ O ₄还可作为有机染料（若丹明B，若丹明6G，刚果红和甲基橙）的还原变色反应的高活性催化剂。因此，我们的策略促进了开发低成本，高性能的无贵金属催化剂来处理水污染。

更新日期：2019-12-17

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