Primary studyPeripheral evidenceSensor

A novel pencil graphite electrode modified with an iron-based conductive metal-organic framework exhibited good ability in simultaneous sensing bisphenol A and bisphenol S

Chen J.-Y., Weng Y.-X., Han Y.-H. et al. · Ecotoxicology and Environmental Safety · 2024 · 116065

8materials
9samples
7synthesis routes
15measurements
79results
6claims and caveats

Evidence map

Open a family to keep every result attached to its sample, method and conditions.

Author interpretations and caveats

Paraphrased for this database from the authors’ stated interpretations — never quoted verbatim — and kept separate from reported measurements.

Application RelevanceSupport assessment: High

Fe-HHTP/PGE can simultaneously detect BPA and BPS over 0.01-100 uM with low nM LODs and acceptable recovery in plastic packaging samples.

Caveat: Application was demonstrated after organic-solvent extraction and PBS dilution; human biological matrices were not tested.

10 · 4. Conclusions · Table 1; Table 3 · Linked to 6 structured results

CaveatSupport assessment: High

The authors note limitations in morphology control, semiconductive Fe-HHTP conductivity, solvent/pH effects in real samples, and untested human matrices.

10 · 3.8 · Linked to 1 structured result

Phase AssignmentSupport assessment: High

The synthesised Fe-HHTP had a typical MOF structure with good crystallinity and mixed-valence Fe.

Caveat: No CIF, Rietveld refinement, elemental quantification, or porosity data were reported in the provided main article.

5 · 3.1 · Fig. 1 · Linked to 6 structured results

Structure Property LinkSupport assessment: High

Coating conductive Fe-HHTP onto PGE reduces charge-transfer resistance and improves electron transfer compared with bare PGE and Fe-HHTP/GCE controls.

Caveat: The paper attributes the effect to conductivity and surface area but does not report a direct BET surface area measurement.

5 · 3.2 · Fig. 2 · Linked to 5 structured results

Transport MechanismSupport assessment: High

BPA and BPS oxidation on Fe-HHTP/PGE is mainly adsorption-controlled and involves approximately two electrons and two protons.

Caveat: Electron numbers were derived from Laviron analysis using assumed alpha = 0.5; proton equivalence inferred from pH slopes.

6,9 · 3.3; 3.4 · Fig. 3D-E; Fig. 4B; Scheme 2 · Linked to 6 structured results

Transport MechanismSupport assessment: Medium

Among Fe-, Co-, Ni-, Cu-, and Zn-HHTP controls, Fe-HHTP gave the greatest BPA/BPS current response, attributed to Fe-based electrical characteristics and mixed valence.

Caveat: The comparative metal-control synthesis and numerical radar-plot values were not fully tabulated.

6 · 3.3 · Fig. 3F · Linked to 1 structured result

Material identities

Names and aliases are kept exactly within the paper’s own identity model.

MaterialCompositionStructure contextSource
Co-HHTPBrowse family: Co₃(HHTP)₂ / Co–HHTPCo-HHTP; exact stoichiometry not reportedCo · HHTPunknown · PristineMetal-HHTP control MOF used in sensing comparison.2,7 · 2.2.1; 3.3 · Fig. 3F
Cu-HHTPBrowse family: Cu₃(HHTP)₂ / Cu–HHTPCu-HHTP; exact stoichiometry not reportedCu · HHTPunknown · PristineMetal-HHTP control MOF used in sensing comparison.2,7 · 2.2.1; 3.3 · Fig. 3F
Fe-HHTPBrowse family: Fe–HHTP familyFe-HHTP; exact stoichiometry not reportedFe, mixed Fe2+/Fe3+ valence · 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP)2D · PristineConductive iron-HHTP MOF with rod-shaped nanocrystals, ordered lamellar structure, XRD peaks assigned to (100), (130), and (002), and XPS evidence for mixed Fe valence.2,5 · Introduction; 3.1 · Fig. 1
Fe-HHTP/PGEBrowse family: Fe–HHTP familyFe-HHTP on pencil graphite electrodeFe in Fe-HHTP · HHTP2D · CompositeComposite electrochemical sensor made by coating Fe-HHTP dispersion on pencil graphite electrode.3 · 2.2.2 · Scheme 1
glassy carbon electrodeglassy carbonunknown · UnknownBare glassy carbon electrode control and Fe-HHTP-coated control substrate.2 · 2.1
Ni-HHTPBrowse family: Ni₃(HHTP)₂ / Ni–HHTPNi-HHTP; exact stoichiometry not reportedNi · HHTPunknown · PristineMetal-HHTP control MOF used in sensing comparison.2,7 · 2.2.1; 3.3 · Fig. 3F
pencil graphite electrodegraphite pencil leadunknown · UnknownBare pencil graphite electrode control and substrate.2 · 2.1
Zn-HHTPBrowse family: Zn–HHTP familyZn-HHTP; exact stoichiometry not reportedZn · HHTPunknown · PristineMetal-HHTP control MOF used in sensing comparison.2,7 · 2.2.1; 3.3 · Fig. 3F

Sample register

Sample form, processing state and composition status define the context for measurements.

Show 9 sample records
SampleForm and roleProcessing and geometrySource
bare GCEresearch_0848__mat__mat_gceElectrode · Pristine Control · Unknowncommercial GCE used as bare control3 · 2.2.2 · Fig. 2; Fig. 3B
bare PGEresearch_0848__mat__mat_pgeElectrode · Pristine Control · Unknownwashed with distilled water and dried at 60 deg C overnight0.5 mm x 60 mm x 1 mm pencil lead cut to 15 mm3 · 2.2.2 · Fig. 2; Fig. 3B
Co-HHTP controlresearch_0848__mat__mat_co_hhtpPowder · Pristine Control · Pristine Frameworkcontrol MOF; details not reported2,7 · 2.2.1; 3.3 · Fig. 3F
Cu-HHTP controlresearch_0848__mat__mat_cu_hhtpPowder · Pristine Control · Pristine Frameworkcontrol MOF; details not reported2,7 · 2.2.1; 3.3 · Fig. 3F
Fe-HHTP/GCEresearch_0848__mat__mat_fe_hhtpElectrode · Pristine Control · CompositePrepared by the same modification procedure as Fe-HHTP/PGEglassy carbon electrode (GCE)3 · 2.2.2 · Fig. 2; Fig. 3B
Fe-HHTP/PGEresearch_0848__mat__mat_fe_hhtp_pgeElectrode · Target Sample · CompositeFe-HHTP/DMF/Nafion dispersion sprayed twice onto pencil lead and dried at 60 deg C for 3 hpencil graphite electrode (PGE)3 · 2.2.2 · Scheme 1
Fe-HHTP powderresearch_0848__mat__mat_fe_hhtpPowder · Composite Component · Pristine Frameworkcentrifuged, washed, acetone-treated, vacuum-dried at 60 deg C for 12 h, ground to powder2 · 2.2.1 · Fig. 1
Ni-HHTP controlresearch_0848__mat__mat_ni_hhtpPowder · Pristine Control · Pristine Frameworkcontrol MOF; details not reported2,7 · 2.2.1; 3.3 · Fig. 3F
Zn-HHTP controlresearch_0848__mat__mat_zn_hhtpPowder · Pristine Control · Pristine Frameworkcontrol MOF; details not reported2,7 · 2.2.1; 3.3 · Fig. 3F