Electron Beam Irradiation‐Induced Formation of Defect‐Rich Zeolites under Ambient Condition within Minutes

Abstract

Zeolites are a well‐known family of microporous aluminosilicate crystals with a wide range of applications. Their industrial synthetic method under hydrothermal condition requires elevated temperature and long crystallization time and is therefore quite energy‐consuming. Herein, we utilize high‐energy electron beam irradiation generated by an industrial accelerator as a distinct type of energy source to activate the formation reaction of Na‐A zeolite. The initial efforts afford an attractive reaction process that can be achieved under ambient conditions and completed within minutes with almost quantitative yield, leading to notable energy saving of one order of magnitude compared to the hydrothermal reaction. More importantly, electron beam irradiation simultaneously exhibits an etching effect during the formation of zeolite generating a series of crystal defects and additional pore windows that can be controlled by irradiation dose. These observations give rise to significantly enhanced surface area and heavy metal removal capabilities in comparison with Na‐A zeolite synthesized hydrothermally. Finally, we show that this method can be applied to many other types of zeolites.

Sulfur edge in molybdenum disulfide nanosheets achieves efficient uranium binding and electrocatalytic extraction in seawater

“…12,13 The low concentration of uranium and the complex environment of seawater motivate researchers to develop a highly efficient strategy for uranium extraction in seawater. [14][15][16] Selective adsorption is the widely used method for uranium extraction in seawater, which requires the selective binding of uranium with adsorbents. [17][18][19] Thanks to the efforts from many research groups, various adsorbents with binding sites for uranium have been developed, such as amidoxime functionalized groups, polyphenols and phosphate groups.…”

Research Progress of Synthesis Methods for Crystalline Porous Materials

“…同时, 通过对不同剂量下合成样品的分析表征, 发现材料在高 剂量下存在明显的辐射损伤. 如图 4b 所示, 在沸石分子 筛的合成中, 高能电子束的引入不仅加速了结晶过程, 并且在材料中产生了丰富的缺陷位点和等级孔结构, 显 著提升了材料的吸附传质能力, 对金属离子及二氧化碳 吸附均有较大提升 [126] . 通过固体核磁技术深入对比分 析, 验证了 Si-OH 缺陷位点的存在.…”

Advances in Hydroxyl Free Radical Assisted Synthesis of Zeolite

“…图 8 γ 射线辐射辅助 A 型沸石的快速合成 [58] Figure 8 Accelerated synthesis of zeolite A under Gamma rays (γ•rays) irradiation [58] 高硅沸石由于其优异的催化性能和高热/水热稳定 性而成为重要的工业催化剂. 其中, 高 SiO 图 9 过氧化氢辅助高硅 Y 型沸石合成的示意图 [59] Figure 9 Schematic illustration of H 2 O 2 assisted synthesis of high-silica zeolite Y [59] Chen 等 [60] 图 10 半导体光催化剂光催化反应机理加速沸石合成的示意图 [62] Figure 10 Schematic diagram of the photocatalytic reaction mechanism of the semiconductor photocatalyst accelerating zeolite synthesis [62] 8 总结与展望 21 世纪以来, 除了传统的应用领域, 沸石分子筛材 料在可再生能源 [4b] 、环境改善 [8a] 、农业 [63] 、生物医学 [64] 等方面也逐渐崭露头角. 广泛的应用使得沸石分子筛的 需求量巨大, 因此, 快速高效地制备沸石分子筛材料具 有十分重要的意义.…”