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On January 20, 2019, the film materials and surface technology research team of Central South University has been conducting in-depth research on the application of diamond coatings in the fields of ultra-hard tool coating, organic wastewater treatment, advanced thermal management materials and biosensors, and has pioneered the use of chemical vapor deposition (CVD) to prepare foam diamond. On this basis, breakthroughs have been made in the manufacture of water treatment electrodes and diamond-reinforced high thermal composites, both of which have recently been published in the international authoritative journals Applied Catalysis B: Environment (Impact Factor 11.698) and Appleed Energy (Impact Factor 7.9).
China's annual wastewater emissions of more than 70 billion tons, electrochemical oxidation technology is one of the most potential difficult biochemical degradation of organic wastewater treatment technology, the core of the technology is electrode materials and their preparation, boron-doped diamond (BDD) electrodes are the focus of research in recent years, these electrodes have the widest electrochemical window (up to 4.5V), extremely high electrode (up to nearly 3V), excellent chemical stability, can be in strong acid, strong alkali, high salt environment for a long time. However, closed two-dimensional flatBD electrodes are widely used, which are smaller than the surface area, slow mass transfer rate, the reaction process is controlled by the diffusion process, organic matter in the liquid phase can not quickly spread to the electrode surface is directly oxidized or electro catalytic strong oxidizing substances (such as hydroxyl free radicals) indirect oxidation, seriously restricting the efficiency of BDD electrochemical oxidation degradation of organic wastewater
China
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the team used chemical vapor deposition (CVD) technology for the first time in the world to build BDD foam electrodes with a three-dimensional network large-hole structure on foam nickel, compared to closed 2D flat electrodes of the same size, BDD foam The electrode not only increases the electrochemical active area by 20 times, but also the three-dimensional network hole structure with uniform distribution and adjustable size can be used for the free flow of wastewater, which greatly accelerates the convex flow of the liquid phase and the electrode surface and improves the mass transfer rate of the liquid phase. The synergy effect of "large ratio surface area and high transfer rate" greatly improves the degradation efficiency of the electrode, and at the small current density of 2.4mA/cm2, the electrochemically degraded active blue 19 of the BDD foam electrode has a transfer rate of more than 95% and a mineralization rate of more than 80%. BDD foam electrode electrochemical performance is excellent, the preparation method is simple and repeatable, the space utilization rate is high, a number of BDD foam electrodes are assembled together, can form a light weight, small footprint, high efficiency, low energy consumption of the actual wastewater treatment device, in the field of non-degradable organic wastewater has a very broad application prospects. In addition, the successful preparation of BDD foam electrodes will also facilitate the application of diamond in electro-catalytic, electrosynthesis, electrochemical sensing, super-capacitors and other fields.
"3D macroporous boron-doped diamond electrode with interconnected liquid flow channels: A high-efficiency electrochemically degraded to RB-19 dyeing under low current", published in the international authoritative journal Applied Catalysis B: Environment (Influence factor 11.698), 2016 graduate students Mei Ruiqiong and Wei Qiuping associate professor as co-first authors, powder metallurgy research institute Professor Zhou Keya, Associate Professor Mary and associate professor Wei Qiuping of the School of Materials Science and Engineering as co-communications author, Central South University as the first unit.
Latent thermal storage can absorb or release a large amount of heat through phase change of materials, and realize the storage and utilization of energy, which can effectively solve the contradiction between energy supply and demand in space and time, and has become a hot research topic in the field of energy storage and utilization in recent years. However, the potential thermal energy storage materials generally have the disadvantages of low thermal conductivity and poor heat exchange performance, which greatly restricts its wide application and development. For the first time, the team introduced high-quality foam diamond into phase-change materials, increasing thermal conductivity from 0.25 W/mK to 6.7 W/mK by building a 3D-connected diamond fast thermal channel in paraffin phase-change materials, a 25.8-fold increase over paraffin. Moreover, with graphite, carbon nanotubes, graphene and other high thermal carbon materials, foam diamond has no obvious thermal anobiographicity, composite unit volume enhancer contribution to thermal conductivity in the same field leading level.
the results of the study, "Thermal Conductivity of the phase change materials with 3D porous diamond foam for thermal energy storage", published in the international authoritative journal Applied Energy (impact factor 7.9), 2016 phD students Zhang Long and Zhou Xuan as co-first authors, Associate Professor Wei Qiuping as the first unit.
While strengthening the basic research of application, the team focused on the national scientific and technological needs, actively responded to the call of "Made in China 2025" and "Innovation drives economic development transformation and upgrading", published more than 80 SCI papers on the application of diamond in sewage treatment, advanced thermal management materials, coating tools and biosensors, declared 32 patents for Chinese inventions (26 authorized), and successfully carried out relevant research results in a timely manner. Independently developed "chemical vapor deposition equipment and its supporting technology" 4 patented technology, "chemical vapor deposition diamond coating tools and mold products and its industrial production technology" 5 patented technology and "wastewater treatment with boron doped diamond electrode and its industrial production technology" 3 patented technology has completed the technology incubation, become the only domestic can achieve boron doped diamond electric large area, large-scale preparation of scientific research units, related devices and products have been large-scale production and marketing.