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Xie J, Fan W, Cui H, Feng N, Wang G, Wang H, Liu X, Qiu G, Wu H. A novel highly dispersed tetra-metal nano heterogeneous ozone catalyst derived from microbial adsorption and in situ pyrolysis. NANOTECHNOLOGY 2021; 32:065701. [PMID: 33210616 DOI: 10.1088/1361-6528/abb1ed] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In recent years, the pyrolysis of microbial biomasses that adsorb various metal ions has enabled the preparation of carbon-based polymetallic nanomaterials with excellent electrocatalytic and electrical energy storage properties. However, the preparation of ozone catalysts by this technique and the corresponding catalytic oxidation mechanism are still unclear. In this study, an Escherichia coli strain (BL21) was used for tetra-metal (Cu, Fe, Mn and Al) absorption and the obtained microbial biomass was pyrolyzed under the protection of a nitrogen flow at 700 °C and activated at 900 °C to prepare a microbial-char-based tetra-metal ozone catalyst (MCOC). This was used to degrade phenol and coking wastewater and exhibited a strong catalytic capability for coking wastewater, whose chemical oxygen demand removal efficiency of 70.86% is 16.7% higher than that of pure ozone and 14.67%, 7.21% and 3.58% higher than that of three commercial catalysts, respectively. It also improved the efficiency of ozonation for phenol by 33%. The MCOC was characterized by x-ray diffraction, x-ray photoelectron spectroscopy, scanning electron microscopy-energy-dispersive spectroscopy, transmission electron microscopy and other methods. The results demonstrated that the spherical metal nanoparticles had sizes ranging from 3 nm to 7 nm and that crystals of Fe2O3 and Fe3P were observed. The study showed that the MCOC promoted the production of more hydroxyl radicals and superoxides from ozone, which attack organics. The oxygen vacancies of the catalyst were also investigated. It was proved that the Lewis acid sites on the surface of metal oxides are the active centers of ozone decomposition. Therefore, this work provides a new method for the synthesis of multi-metal nanocomposites and expands the application of biosynthetic nanomaterials.
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Affiliation(s)
- Jianping Xie
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
| | - Wei Fan
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
| | - Hao Cui
- State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Kunming 650106, People's Republic of China
| | - Ningning Feng
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
| | - Guozhen Wang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
| | - Hui Wang
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
| | - Xinxing Liu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
| | - Guanzhou Qiu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
| | - Haiyan Wu
- School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, People's Republic of China
- Key Laboratory of Biometallurgy, Ministry of Education, Changsha 410083, People's Republic of China
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Recent Progress in Magnetron Sputtering Technology Used on Fabrics. MATERIALS 2018; 11:ma11101953. [PMID: 30322000 PMCID: PMC6213017 DOI: 10.3390/ma11101953] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 10/04/2018] [Accepted: 10/09/2018] [Indexed: 11/24/2022]
Abstract
The applications of magnetron sputtering technology on the surface coating of fabrics have attracted more and more attention from researchers. Over the past 15 years, researches on magnetron sputtering coated fabrics have been mainly focused on electromagnetic shielding, bacterial resistance, hydrophilic and hydrophobic properties and structural color etc. In this review, recent progress of the technology is discussed in detail, and the common target materials, technologies and functions and characterization of coated fabrics are summarized and analyzed. Finally, the existing problems and future prospects of this developing field are briefly proposed and discussed.
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