Iuzviuk Mariia H, Bouali Anissa C, Serdechnova Maria, Yasakau Kiryl A, Wieland D C Florian, Dovzhenko Gleb, Mikhailau Aliaksandr, Blawert Carsten, Zobkalo Igor A, Ferreira Mario G S, Zheludkevich Mikhail L
Petersburg Nuclear Physics Institute named by B.P. Konstantinov of National Research Centre «Kurchatov Institute», Laboratory of Physics of Crystals, Leningradskaya Oblast, 1, mkr. Orlova Roshcha, 188300, Gatchina, Russia.
Phys Chem Chem Phys. 2020 Aug 21;22(31):17574-17586. doi: 10.1039/d0cp01765e. Epub 2020 Jul 27.
Kinetic parameters for three anion exchange reactions - Zn-LDH-NO→ Zn-LDH-Cl, Zn-LDH-NO→ Zn-LDH-SO and Zn-LDH-NO→ Zn-LDH-VO- were obtained by in situ synchrotron study. The first and the second ones are two-stage reactions; the first stage is characterized by the two-dimensional diffusion-controlled reaction following deceleratory nucleation and the second stage is a one-dimensional diffusion-controlled reaction also with a decelerator nucleation effect. In the case of exchange NO→ Cl host anions are completely released, while in the case of NO→ SO the reaction ends without complete release of nitrate anions. The exchange of Zn-LDH-NO→ Zn-LDH-VO is a one-stage reaction and goes much slower than the previous two cases. The latter is characterized by a one stage two-dimensional reaction with an instantaneous nucleation. As a result, at the end of this process there are two crystalline phases with different polyvanadate species, presumably VO and VO, nitrate anions were not completely released. The rate of replacing NO anions by guest ones can be represented as Cl > SO > VO.
通过原位同步加速器研究获得了三种阴离子交换反应——Zn-LDH-NO→Zn-LDH-Cl、Zn-LDH-NO→Zn-LDH-SO和Zn-LDH-NO→Zn-LDH-VO-的动力学参数。前两个反应是两阶段反应；第一阶段的特征是在减速成核后进行二维扩散控制反应，第二阶段是同样具有减速成核效应的一维扩散控制反应。在NO→Cl交换的情况下，主体阴离子完全释放，而在NO→SO交换的情况下，反应结束时硝酸根阴离子没有完全释放。Zn-LDH-NO→Zn-LDH-VO的交换是一个单阶段反应，比前两种情况进行得慢得多。后者的特征是具有瞬时成核的单阶段二维反应。因此，在这个过程结束时，有两种具有不同多钒酸盐物种的晶相，推测为VO和VO，硝酸根阴离子没有完全释放。客体阴离子取代NO阴离子的速率可以表示为Cl＞SO＞VO。
Zotero 插件