Kiwaan H.A., Sh. Mohamed F., El-Bindary A.A. et al. · Journal of Molecular Liquids · 2021 · 117435
Open a family to keep every result attached to its sample, method and conditions.
Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.
Cationic dye adsorption is promoted at alkaline pH because ZIF-7 is negatively charged above pHPZC 7.5, favouring electrostatic attraction to MB and BG.
Caveat: Mechanism is inferred by the authors from pH response and kinetic/isotherm fits rather than direct surface-complex evidence.
4-5 · 3.2.2. Effect of pH · Figs. 5, 6 · Linked to 3 structured results
Adsorption thermodynamics indicate an endothermic and spontaneous adsorption process for MB and BG on ZIF-7.
Caveat: Thermodynamic constants are adsorption-derived and depend on the authors' Kc definition.
11-12 · 3.2.8. Parameters of thermodynamics · Table 6 · Linked to 4 structured results
MB and BG adsorption kinetics on ZIF-7 are best described by a pseudo-second-order kinetic model, consistent with chemisorption.
Caveat: Model-fit assignment relies on linearised kinetic models; no independent mechanistic spectroscopy is reported.
9 · 3.2.7. Kinetics of adsorption and mechanism studies · Tables 4, 5 · Linked to 2 structured results
The synthesised product is crystalline ZIF-7, supported by PXRD peaks matching known rhombohedral ZIF-7/JCPDS data and EDX detection of C, N and Zn.
Caveat: No CIF or Rietveld refinement is provided in the assigned documents.
3-4 · 3.1.1 and 3.1.5 · Figs. 1, 4 · Linked to 3 structured results
ZIF-7 is described as mesoporous with BET surface area 94.19 m2 g-1 and average pore size 2.79 nm.
Caveat: BET/BJH numerical values are reported in text; raw sorption data are not provided.
3 · 3.1.3. Brunauer-Emmett-Teller (BET) surface area · Fig. 2 · Linked to 3 structured results
The AC conduction mechanism of pristine ZIF-7 is assigned to the overlapping large-polaron tunneling (OLPT) model.
Caveat: The article does not report device preparation/contact geometry, and S values are only available from the plotted figure.
14 · 3.3. AC measurements analysis · Fig. 23 · Linked to 5 structured results
Names and aliases are kept exactly within the paper’s own identity model.
| Material | Composition | Structure context | Source |
|---|---|---|---|
| Zeolitic imidazolate framework-7 (ZIF-7) | Zn(benzimidazolate)2 / ZIF-7Zn(II) nodes from zinc nitrate hexahydrate · Benzimidazolate linker from benzimidazole | 3D · PristineCrystalline ZIF-7 assigned from powder XRD; diffraction peaks match rhombohedral ZIF-7 and JCPDS card No. 06-062-1030. | 3 · 3.1.1. X-ray diffraction (XRD) patterns · Fig. 1 |
Sample form, processing state and composition status define the context for measurements.
| Sample | Form and role | Processing and geometry | Source |
|---|---|---|---|
| ZIF-7 sample for AC measurementsresearch_0447__mat__mat_zif7 | Unknown · Target Sample · Pristine Framework | AC capacitance/loss measurements; article does not describe pellet fabrication or contact geometry.d used in dielectric equation; numeric thickness not reported | 13 · 3.3. AC measurements analysis · Eqs. 16-18; Figs. 21-23 |
| Vacuum-dried ZIF-7research_0447__mat__mat_zif7 | Powder · Target Sample · Pristine Framework | Final activation/drying step: 24 h under vacuum at 160 C. | 2 · 2.3. Preparation of the adsorbent |
| White ZIF-7 crystalsresearch_0447__mat__mat_zif7 | Powder · Target Sample · Pristine Framework | Hydrothermal product soaked in methanol, dried at room temperature, then vacuum dried at 160 C. | 2 · 2.3. Preparation of the adsorbent |
| Brilliant-green-loaded ZIF-7research_0447__mat__mat_zif7 | Powder · Target Sample · Guest Loaded | ZIF-7 after BG adsorption, regenerated by HCl/water/ethanol washing and drying. | 12 · 3.2.11. Reusability test of adsorbent |
| Methylene-blue-loaded ZIF-7research_0447__mat__mat_zif7 | Powder · Target Sample · Guest Loaded | ZIF-7 after MB adsorption, regenerated by HCl/water/ethanol washing and drying. | 12 · 3.2.11. Reusability test of adsorbent |