Hydrogen has the characteristics of high combustion calorific value and no pollution, and is regarded as the clean energy with the most development potential in the 21st century. However, traditional hydrogen production technology consumes a lot of energy and is accompanied by a large amount of carbon dioxide release. The use of renewable energy to produce hydrogen has always been a research focus at home and abroad.
Biomass is an energy carrier with a wide range of sources, large reserves, cheap and sustainable use. Rice straw, wheat straw, and straw in agricultural production, paper cups and trays made of wood fiber in daily life, and sludge discharged from pulp and paper all contain a large amount of biomass, but these biomass are often discarded as waste. Photocatalytic biomass hydrogen production technology can use solar energy to convert biomass into hydrogen. It is a very potential new energy production method and provides a new solution for the recycling of biomass resources and the sustainable development of hydrogen energy. way.
The photoelectric functional materials and device research team of the Institute of Test and Analysis, Guangdong Academy of Sciences designed and developed a new polymeric carbon nitride-based photocatalyst with edge amino functionalization, and combined with spectrometer, electrochemical workstation, gas chromatography and other means and theoretical calculations. It performs performance characterization and optimization. The study found that the modified photocatalyst has a broad spectrum of visible light absorption (see the figure below), and its spectral response activity range can be extended to 600nm, compared with the existing biomass hydrogen production photocatalyst (generally only can absorb less than 475 nm Light), which significantly broadens the absorption of visible light. At the same time, the energy band structure of the catalyst is analyzed, and it is found that the oxidation capacity of the catalyst is improved, and it can promote the adsorption and activation of biomass on the catalyst surface, thus effectively improving the efficiency of photocatalytic biomass hydrogen production.
Relevant results were published in "Chemical Engineering Journal" (District 1, Chinese Academy of Sciences, IF:10.652) with the title of "Edge functionalization of terminal amino group in carbon nitride by in-situ C–N coupling for photoreforming of biomass into H2", tested by the Provincial Academy of Sciences The Institute of Analysis is the only unit, and the above work has been supported by the National Natural Science Foundation of China (61904167) and the Guangdong Academy of Sciences to build a domestic first-class research institution special fund project (2020GDASYL-20200102006). (Provincial Academy of Sciences Testing and Analysis Institute Wang Fuxian/contribution)
Figure 1 Energy band structure of materials and hydrogen production performance of biomass
The utility model discloses a Kitchen Shower head that is convenient to switch the water outlet mode, has a compact structure, and is easy to use and a kitchen faucet using the kitchen shower head. The shower head includes a shower body and a shower head provided with a spray water outlet and a V-shaped water outlet. , The shower head is provided with a water separator, and the water separator is provided with an annular flow channel and an inner flow channel respectively connected to the spray water outlet body and the V-shaped water outlet body, and the lower end of the outer wall of the water separator is upwardly circular A plurality of water inlet holes connected to the annular flow channel are provided, and a first sealing ring is provided on the lower side of the water inlet hole; the water outlet end of the shower body is connected with a converter, and the converter is provided with a communicating In the water diversion cavity at the water outlet end of the shower body, the lower end of the water diversion device is installed in the water diversion cavity and can move up and down, and the upper end of the inner wall of the water diversion cavity is provided with a matching first sealing ring
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