Confining carbon dots in extra-large pore zeolite SYSU-3 assembled in a mixed-template system

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED Microporous and Mesoporous Materials Pub Date : 2024-04-24 DOI:10.1016/j.micromeso.2024.113155

Jiali Wen , Chuanqi Zhang , Yang Zhang , Zhifeng Zeng , Fei Ma , Jiuxing Jiang

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Abstract

The 24-membered ring -SYT type extra-large pore zeolite, denoted as DESO-SYSU-3, has been synthesized by employing N,N′-diethylsophoridine and trimethylsulfanium in a mixed-template system, where the N,N′-diethylsophoridine and trimethylsulfanium played different roles in the crystallization process. A single usage of N,N′-diethylsophoridine led to the formation of an unknown phase (donated as SYSU-5). These results reveal that the utilization of alkaloid-derived organic structure-directing agents (OSDAs) is an efficient synthetic strategy to produce specific extra-large pore zeolites and related structures. Compared to the prototype SYSU-3, the addition of TMSF into the system not only improved the silicon content in the framework of DESO-SYSU-3 but also facilitated the generation of carbon dots (CDs) confined in extra-large pore structure. The structure and the proposed formation mechanism of CDs were investigated based on HRTEM, XPS, FI-IR, UV–Vis, Raman and photoluminescence spectrum. The CDs@zeolite composite exhibited intriguing optical properties of both fluorescence and room temperature phosphorescence, respectively. This work extends extra-large pore zeolite as the matrix for the development of CDs@zeolite composites with tunable optical properties.

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在混合模板系统中组装的超大孔沸石 SYSU-3 中封闭碳点

通过在混合模板体系中使用 N,N′-二乙基槐啶和三甲基锍，合成了 24 元环 -SYT 型超大孔沸石（命名为 DESO-SYSU-3），其中 N,N′-二乙基槐啶和三甲基锍在结晶过程中发挥了不同的作用。单一使用 N,N′-二乙基horidine 会导致形成未知相（捐献为 SYSU-5）。这些结果表明，利用生物碱衍生的有机结构引导剂（OSDA）是生产特异性超大孔沸石和相关结构的有效合成策略。与原型 SYSU-3 相比，在体系中加入 TMSF 不仅提高了 DESO-SYSU-3 框架中的硅含量，还促进了碳点（CD）在超大孔结构中的生成。基于 HRTEM、XPS、FI-IR、UV-Vis、拉曼和光致发光光谱研究了 CD 的结构和拟议的形成机制。CDs@zeolite 复合材料分别表现出荧光和室温磷光两种有趣的光学特性。这项研究将超大孔沸石作为基质，开发出具有可调光学特性的 CDs@ 沸石复合材料。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.