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当前位置: 网站首页 > 新闻 > 成果报道 > 2021年11月9日:美国Phys.org 以“New nanocomposite improves solar evaporation for water purification”为题报道了课题组近期在光热水净化领域的成果

2021年11月9日:美国Phys.org 以“New nanocomposite improves solar evaporation for water purification”为题报道了课题组近期在光热水净化领域的成果

来源:本站   发布时间: 2021-11-25 22:42:43   浏览:863次  字号: [大] [中] [小] [收藏]
Solar-thermal interfacial evaporation has been considered the most promising strategy for addressing this problem However, developing an optimized material featuring both eff


Solar-thermal interfacial evaporation has been considered the most promising strategy for addressing this problem. However, developing an optimized material featuring both efficient solar-vapor conversion and good environmental tolerance still remains challenging.


Researchers from the Institute of Process Engineering (IPE) of the Chinese Academy of Sciences have developed an ultra-stable amorphous Ta2O5/C nanocomposite with a hollow multishelled structure (HoMS) for solar evaporation, which can improve the efficiency of water purification.


The study was published in Advanced Materials on Oct. 29.


"The precise atomic and composition control in the building block of HoMS realizes an indirect bandgap structure with abundant energy states around the Fermi level, which enhances nonradiative relaxation to facilitate photothermal conversion," said Prof. Wang Dan, the corresponding author of the study, "The unique hollow multishelled structure can efficiently enhance light absorption like a blackbody."


HoMS decreases the energy required for water evaporation. Simulation results show that HoMS establishes a thermal field gradient, thus providing the driving force for vapor evaporation.


"HoMS also benefits water transport," said Wang, "The confined cavities in HoMS promote liquid water diffusion owing to the capillary pumping effect, and the nanopores in HoMS induce water molecules to evaporate in the form of clusters, thus enabling evaporation with less enthalpy."


With highly efficient photoabsorption and photothermal conversion, a super-fast evaporation speed of 4.02 kg m-2h-1 has been achieved. The evaporation speed barely changed after 30 days, and with no salt accumulation, indicating a long-term stability.


Notably, the concentration of pseudovirus SC2-P could be decreased by six orders of magnitude after evaporation.


This amorphous Ta2O5/C composite is readily fabricated, carried, stored, and recycled. It can be applied to the purification of seawater, or to heavy metal- or bacteria-containing water, obtaining drinkable water that meets the standard of the World Health Organization.


The scientists from IPE are preparing a prototype of seawater desalination for the residents on isolated islands.


报道直达链接https://phys.org/news/2021-11-nanocomposite-solar-evaporation-purification.html

成果直达链接https://onlinelibrary.wiley.com/doi/10.1002/adma.202107400

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友情链接: Chem. Res. Chinese Universities CCS Chemistry Materials Chemistry Frontiers 中空多壳层纳微结构香山科学会议 第二届中空纳米材料国际研讨会 佛山市高明区(中国科学院)新材料产业研究院

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