基于磁性可回收非贵金属粉煤灰的高效 4-硝基苯酚还原催化剂

IF 3.8 3区 化学 Q2 CHEMISTRY, PHYSICAL
Catalysts Pub Date : 2023-12-19 DOI:10.3390/catal14010003
I. Kuźniarska-Biernacka, Inês Ferreira, Marta Monteiro, A. C. Santos, Bruno Valentim, Alexandra Guedes, João H. Belo, João P. Araújo, Cristina Freire, A. F. Peixoto
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引用次数: 0

摘要

4- 硝基苯酚(4-NPh)是化学工业中大量生产的有害化合物,使用贵金属作为催化剂将其还原为氨基苯酚(4-APh)是研究最多的工艺之一。开发不含贵金属的催化剂在大规模应用中具有经济优势,并有助于原材料的可持续发展。煤粉灰(FA)是煤炭燃烧产生的一种主要废料,它含有一种易于回收的磁性馏分(FAmag 样品),由富含铁的颗粒组成,可以在 4-NPh 还原过程中替代贵金属催化剂,同时还具有易于通过磁性分离回收的优点。为此,我们采用一种简便、环保且经济高效的方法制备了一种含有铜铁氧体纳米颗粒的新型复合材料(FAmag@CS@CuFe),该方法由三部分组成:FAmag是核心,生物基聚合物壳聚糖(CS)是连接剂,铜铁氧体CuFe2O4纳米颗粒(CuFe)是活性位点。研究了 FAmag@CS@CuFe 材料的结构、形态、组成和磁性能,以评估制备效率。研究发现,与原始的 FAmag 和裸 CuFe 纳米粒子相比,生物聚合物能防止 CuFe 纳米粒子的聚集,并能协同提高还原 4-NPh 的活性。FAmag@CS@CuFe 催化剂在 3 分钟内对 4-NPh 的转化率高达 95%,且在四个连续循环中表现出高效性和稳定性。如此显著的催化效果证明了这种催化剂替代昂贵贵金属的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Highly Efficient and Magnetically Recyclable Non-Noble Metal Fly Ash-Based Catalysts for 4-Nitrophenol Reduction
4-nitrophenol (4-NPh) is a harmful compound produced in large amounts in the chemical industry, and its reduction to aminophenol (4-APh) using noble metals as catalysts is one of the most studied processes. The development of noble metal-free catalysts represents an economic advantage in large-scale applications and contributes to the sustainability of raw materials. Coal fly ash (FA), a major waste stream from coal combustion, contains an easily recoverable magnetic fraction (FAmag sample) composed of Fe-rich particles that could substitute noble metal catalysts in 4-NPh reduction, with the concomitant advantage of being easily recovered via magnetic separation. For this purpose, a new composite material containing copper ferrite nanoparticles (FAmag@CS@CuFe) was prepared via a facile, environmentally friendly and cost-effective method based on three components: FAmag as the core, a biobased polymer chitosan (CS) as the linker and copper ferrite CuFe2O4 nanoparticles (CuFe) as the active sites. The structure, morphology, composition and magnetic properties of the FAmag@CS@CuFe material were studied to assess the efficiency of the preparation. It was found that the biopolymer prevented the aggregation of CuFe nanoparticles and enabled a synergistically outstanding activity towards the reduction of 4-NPh in comparison to the pristine FAmag and bare CuFe nanoparticles. The FAmag@CS@CuFe catalyst showed efficiency and stability in the conversion of 4-NPh of up to 95% in 3 min over four consecutive cycles. Such remarkable catalytic results demonstrate the potential of this catalyst as a substitute for expensive noble metals.
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来源期刊
Catalysts
Catalysts CHEMISTRY, PHYSICAL-
CiteScore
6.80
自引率
7.70%
发文量
1330
审稿时长
3 months
期刊介绍: Catalysts (ISSN 2073-4344) is an international open access journal of catalysts and catalyzed reactions. Catalysts publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.
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