The rational design of covalent organic framework (COF) based hybrid materials is of paramount importance to address fundamental challenges of COF with respect to its poor electron mobilization and the...

Techniques beyond crystal engineering are critical for manufacturing covalent organic frameworks (COFs) and to explore them for advanced applications. However, COFs are normally obtained as insoluble, unmeltable, and thus nonprocessible microcrystalline powders. Therefore, it is a significant challenge to implement COFs into larger architectures and structural control on different length scales. Herein, a facile strategy is presented to prepare flexible COF nanofiber membranes by in‐situ growth of COFs on polyacrylonitrile (PAN) nanofiber substrates via a reversible polycondensation‐termination approach. The obtained PAN@COF nanofiber membranes with vertically aligned COF nanoplates combine a large functional surface with efficient mass transport, thus making it a promising adsorbent, for example, for water purification. The antibiotic pollutant ofloxacin (OFX) is removed from water with a superior absorption capacity of ≈236 mg g−1 and removal efficiency as high as 98%. The here presented in‐situ growth of COFs on nanofiber membranes can be extended to various Schiff base‐derived COF materials with different compositions, providing a highly efficient way to construct flexible COF‐based membranes for several applications.

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With the continuous improvement of the income level of Chinese residents and the popularity of coffee culture among Chinese consumers, the annual coffee consumption in the Chinese market continues to rise. More and more coffee brands are entering the market, intensifying market competition. Large chain brands, represented by Starbucks, have gradually occupied an absolute leading position in the fierce market competition. JDE Peet's is the father of Starbucks, but it is a new player in the Chinese market. Therefore, this paper is guided by the research results of the coffee industry in the world and the Chinese market, adopts the SWOT analysis method and analyzes the company's financial data to analyze Peet's business status, existing problems, internal and external environment, and its own advantages and disadvantages in the Chinese market. Through analysis, it is found that although Peet's has gradually opened up the consumer market in big cities such as Beijing and Shanghai in China, the market is still too narrow, and there is no strong competitiveness, and there are still a series of brand positioning that is not accurate and clear. In the face of strong Starbucks and Luckin Coffee, it is obviously impossible to win in the market competition. Therefore, JDE Peet's doesn't currently have big investment value.

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