当前位置：
X-MOL 学术
›
Chem. Mater.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Three-Dimensionally Ordered Macroporous Mixed Metal Oxide as an Indicator for Monitoring the Stability of ZIF-8
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-04-08 , DOI: 10.1021/acs.chemmater.9b05395 Minog Kim 1 , Wenyang Zhao 1 , Michael Tsapatsis 2 , Andreas Stein 1
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-04-08 , DOI: 10.1021/acs.chemmater.9b05395 Minog Kim 1 , Wenyang Zhao 1 , Michael Tsapatsis 2 , Andreas Stein 1
Affiliation
|
Three-dimensionally ordered macroporous (3DOM) ZnO-CeO2-Al2O3 (MMO)@ZIF-8 was synthesized via a vapor-phase pseudomorphic transformation from 3DOM MMO and 2-methylimidazole that maintained the periodic, interconnected pore structure of the starting material, even for relatively small (190 nm diameter) macropores. After structural optimization via the synthesis conditions, this simple, solvent-free method resulted in a thin, uniform ZIF-8 shell on the 3DOM skeleton with a capacity of 47 mg/g for Rhodamine B (RhB) dye adsorption. The 3DOM MMO@ZIF-8 composite material was suitable for monitoring the reactivity and stability of ZIF-8 in different solvent systems simply and effectively by using the included crystalline CeO2 phase as an internal standard for comparing powder X-ray diffraction (XRD) intensities after dye adsorption steps. By taking advantage of the internal standard, it was clearly shown that ZIF-8 dissolves slowly during dye adsorption in an aqueous system, exposing new adsorption sites during recycling. This behavior benefits the reuse of the ZIF-8 adsorbent during a few cycles, but leads to adsorbent loss in the long run.
中文翻译：
三维有序大孔混合金属氧化物作为监测ZIF-8稳定性的指标
通过3DOM MMO和2-甲基咪唑的气相拟晶转变合成了三维有序大孔（3DOM）ZnO-CeO 2 -Al 2 O 3（MMO）@ ZIF-8。起始材料，即使是相对较小（直径190 nm）的大孔。通过合成条件进行结构优化后，这种简单的无溶剂方法在3DOM骨架上形成了一个薄而均匀的ZIF-8壳，其吸附若丹明B（RhB）染料的能力为47 mg / g。3DOM MMO @ ZIF-8复合材料适合使用所包含的结晶CeO 2，简单有效地监测ZIF-8在不同溶剂体系中的反应性和稳定性。相作为内标，用于比较染料吸附步骤后的粉末X射线衍射（XRD）强度。通过利用内标，可以清楚地表明ZIF-8在水性体系中的染料吸附过程中溶解缓慢，在回收过程中暴露出新的吸附位点。这种行为有利于ZIF-8吸附剂在几个周期内的重复使用，但从长远来看会导致吸附剂损失。
更新日期：2020-04-08
中文翻译：
三维有序大孔混合金属氧化物作为监测ZIF-8稳定性的指标
通过3DOM MMO和2-甲基咪唑的气相拟晶转变合成了三维有序大孔（3DOM）ZnO-CeO 2 -Al 2 O 3（MMO）@ ZIF-8。起始材料，即使是相对较小（直径190 nm）的大孔。通过合成条件进行结构优化后，这种简单的无溶剂方法在3DOM骨架上形成了一个薄而均匀的ZIF-8壳，其吸附若丹明B（RhB）染料的能力为47 mg / g。3DOM MMO @ ZIF-8复合材料适合使用所包含的结晶CeO 2，简单有效地监测ZIF-8在不同溶剂体系中的反应性和稳定性。相作为内标，用于比较染料吸附步骤后的粉末X射线衍射（XRD）强度。通过利用内标，可以清楚地表明ZIF-8在水性体系中的染料吸附过程中溶解缓慢，在回收过程中暴露出新的吸附位点。这种行为有利于ZIF-8吸附剂在几个周期内的重复使用，但从长远来看会导致吸附剂损失。
京公网安备 11010802027423号