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Layered CuNi-Cu2O/NiAlOx nanocatalyst for rapid conversion of p-nitrophenol to p-aminophenol

Authors: Lin Fu, Wei Zhou, Ming Wen1,Qingsheng Wu, Weiying Li, Dandan Wu, Quanjing Zhu, Jiaqi Ran, and Panpan Ren

Abstract: In order to well arrangeactive sites and avoid byproducts, the reasonable structured carriernanocatalyst plays a crucial role in high catalytic performance, but stillremains a challenge. Herein, the layered CuNi-Cu2O/NiAlOxnanosheets have been constructed through hydrothermal synthesis followed bycalcination and H2 reduction treatment process. The in-situ formed CuNinanoalloys (NAs) and nano-Cu2O were evenly distributed on thebilateral surface of layered NiAlOx nanosheets. Based on the planar structureof nanosheet, the synergy between catalytic active CuNi NAs and photocatalyticactive nano-Cu2O endows CuNi-Cu2O/NiAlOxnanosheets with rapid conversion efficiency for catalyzing p-nitrophenol (p-NP,14 mg·L-1) to p-aminophenol (p-AP) in 32 s with the reaction rateconstant k up to 0.1779 s-1, and no obvious performance decay can beobserved even over 27 cycles. Moreover, high concentration of p-NP at 10 and 20g·L-1 could be reduced to p-AP within 14 and 20 min, respectively.Such designed nanoalloy/bimetal-oxide heterostructure can provide a solutionfor rapid conversion of aminoaromatics from nitroaromatics wastewater even at alarge concentration range.


摘要翻译:为了更好利用活性位点,避免副产物的产生,设计合理结构载体纳米催化剂对提高催化性能起着至关重要的作用,但该工作仍然是一个挑战。本文通过水热合成、煅烧、氢气还原等工艺制备了CuNi-Cu2O/NiAlOx层状纳米片。原位生成的CuNi纳米合金和纳米Cu2O均匀分布在层状NiAlOx纳米片的双边表面。基于纳米片的平面结构,利用催化活性CuNi NAs与光催化活性之纳米Cu2O的协同作用赋予了CuNi-Cu2O/NiAlOx层状纳米片对p-NP14 mg·L-1)向p-AP的快速转换效率,即在32 s内全部转化,且反应速率常数高达0.1779 s-1。在循环试验中,即使经过27个周期,材料的性能仍没有明显的衰变。此外,1020 g·L-1p-NP可分别在1420 min内被全部还原为p-AP,表明该材料可适应高浓度对硝基苯酚下的催化还原。这种设计的纳米合金/双金属-氧化物异质结构可以为在较大浓度范围内从硝基芳烃废水中快速转化氨基芳烃提供解决方案。

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