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High efficient catalytic oxidation of 5-hydroxymethylfurfural into 2,5-furandicarboxylic acid under benign conditions with nitrogen-doped graphene encapsulated Cu nanoparticles

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Journal of Energy Chemistry 2020年第11期29卷 96-105页

作者： Chaoxin Yang Xiao Li Zhenzhou Zhang Bohan Lv Jiachun Li Zhenjian Liu Wanzhen Zhu Furong Tao Guangqiang Lv Yongxing Yang Shandong Provincial Key Laboratory of Molecular Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353ShandongChina Key Laboratory of Coal Processing and Efficient Utilization Ministry of EducationChina University of Mining and TechnologyXuzhou 221116JiangsuChina Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education School of Chemical EngineeringZhengzhou University.Zhengzhou 450001HenanChina School of Chemistry and Chemical Engineering Shanxi UniversityTaiyuan 030006ShanxiChina

Selective oxidation of 5-hydroxymethylfurfual(HMF) to 2,5-furandicarboxylic acid(FDCA) as a bioplastics monomer is efficiently promoted by a simple system without noble-metal and base additives. In this work, graphene oxide(GO) was first synthesised by an electrochemical method with flexible graphite paper(FGP) as start carbon material, then, nitrogen-doped graphene(NG) layers encapsulated Cu nanoparticles(NPs) was prepared by one-step thermal treatment of GO supported Cu2+ in flowing NH3 atmosphere. Compared with NG supported Cu NPs prepared by the traditional impregnation method, enhanced catalytic activity was achieved over Cu/NG and an FDCA yield of 95.2% was achieved under mild reaction conditions with tert-butylhydroperoxide(t-BuOOH) as the oxidant. Control experiments with different catalysts and different addition procedure of t-BuOOH showed the yield of HMF and various intermediates during reaction. From the changing of intermediates concentrations and reaction rates, a reaction pathway through HMF-DFF-FFCA-FDCA was proposed. This work gives a more convenient, more green,more economical and effective method in encapsulated metal NPs preparation and high selectivity in HMF oxidation to FDCA under mild conditions.

关键词： Graphene oxide encapsulated nanoparticles 5-hydroxymethylfurfual 2,5-furandicarboxylic acid Oxidation Noble-metal free

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Effect of Iron nanoparticles Synthesized by a Sol-Gel Process on Rhodococcus erythropolis T902.1 for Biphenyl Degradation

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Journal of Water Resource and Protection 2015年第3期7卷 264-277页

作者： Wissal Wannoussa Thibaut Masy Stephanie D. Lambert Benoit Heinrichs Ludivine Tasseroul Alaaeddin Al-Ahmad Frederic Weekers Philippe Thonar Serge Hiligsmann Walloon Center of Industrial Biology Department of Chemistry and Bio-industriesUniversity of LiegeGemblouxBelgium Laboratory of Nanomaterials Catalysis and ElectrochemistryUniversity of LiegeLiegeBelgium Artechno S.A. Gembloux-Les IsnesBelgium

nanoparticles (NPS) are considered as a new generation of compounds to improve environmental remediation and biological processes. The aim of this study is to investigate the effect of iron NPS encapsulated in porous silica (SiO2) on the biphenyl biodegradation by Rhodococcus erythropolis T902.1 (RT902.1). The iron NPS (major iron oxide FexOy form) were dispersed in the porosity of a SiO2 support synthesized by sol-gel process. These Fe/SiO2 NPS offer a stimulating effect on the biodegradation rate of biphenyl, an organic pollutant that is very stable and water-insoluble. This positive impact of NPS on the microbial biodegradation was found to be dependent on the NPS concentration ranging from 10-6 M to 10-4 M. After 18 days of incubation the cultures containing NPS at a concentration of 10-4 M of iron improved RT902.1 growth and degraded 35% more biphenyl than those without NPS (positive control) or with the sole SiO2 particles. Though the microorganism could not interact directly with the insoluble iron NPS, the results show that about 10% and 35% of the initial 10-4 M iron NPS encapsulated in the SiO2 matrix would be incorporated inside or adsorbed on the cell surface respectively and 35% would be released in the supernatant. These results suggest that RT902.1 would produce siderophore-like molecules to attract iron from the porous silica matrix.

关键词： Biodegradation Biphenyl Rhodococcus erythropolis encapsulated nanoparticles Sol-Gel Iron

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