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Make waste profitable: repurposing SAPO-34 coke from the methanol-to-olefin reaction for luminescent CDs@zeolite composites
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2022-06-11 , DOI: 10.1039/d2qi00998f
Wenyan Ma 1 , Yida Zhou 1 , Jiani Zhang 1 , Siyu Zong 1 , Bolun Wang 1 , Jiyang Li 1
Affiliation  

It is critical to propose effective and facile methods to decrease the waste of deactivated zeolite catalysts and encourage waste reuse. Herein, we offer an ecologically beneficial concept to transform SAPO-34 coke left over from the methanol-to-olefin reaction into carbon dots (CDs)-confining zeolite composites with multiple luminosities by simple calcination. A batch of CDs-based zeolite composites (CDs@Z-T, CDs@Z-t) was prepared by regulating the calcination temperature and time, which exhibited variable multi-color fluorescence (orange, yellow, green, and blue) as well as green room temperature phosphorescence (RTP) with the longest lifetime of 249 ms. Further research revealed that changing the calcination conditions causes variances in the carbonization and surface functional groups of CDs, leading to tunable luminescence behaviors. The application in time-resolved encryption was realized based on the as-prepared composites. This work provides a novel synthetic route for synthesizing CDs-based composites from catalytic waste.

中文翻译:

让废物获利:将甲醇制烯烃反应中的 SAPO-34 焦炭重新用于发光 CDs@沸石复合材料

提出有效且简便的方法来减少失活沸石催化剂的浪费并鼓励废物再利用至关重要。在这里,我们提供了一个生态有益的概念,通过简单的煅烧将甲醇制烯烃反应中剩余的 SAPO-34 焦炭转化为具有多种发光度的碳点 (CDs) 限制沸石复合材料。一批CDs基沸石复合材料(CDs@Z- T、CDs@Z - t)是通过调节煅烧温度和时间制备的,它表现出可变的多色荧光(橙色、黄色、绿色和蓝色)以及绿色室温磷光(RTP),最长寿命为249 ms。进一步的研究表明,改变煅烧条件会导致 CD 的碳化和表面官能团发生变化,从而导致可调谐的发光行为。基于所制备的复合材料实现了时间分辨加密中的应用。这项工作为从催化废物中合成 CDs 基复合材料提供了一种新的合成途径。
更新日期:2022-06-11
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