Zeolite, cuboidal, crystalline, synthetic, non-fibrous

Nanomaterial photocatalytic activity

Administrative data

Endpoint:

nanomaterial photocatalytic activity

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods with acceptable restrictions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2022

Report date:

2022

Materials and methods

Test guideline

Qualifier:

no guideline available

Principles of method if other than guideline:

This study was carried out to obtain information about the photochemical behavior of zeolites. For this purpose, Photoluminescence (PL) and photoluminescence excitation (PL) spectra were recorded.

GLP compliance:

not specified

Type of method:

other: Photoluminescence (PL) and photoluminescence excitation (PL)spectra were recorded.

Test material

Test material information

Constituent 1

Reference substance name:

Zeolite, cuboidal, crystalline, synthetic, non-fibrous

EC Number:

930-915-9

Cas Number:

1318-02-1

Molecular formula:

M2/nO • Al2O3 • ySiO2 • wH2O (n is the valency of the cation M, predominantly Na, y can range from 0.64 to 8.8, and w is the number of water molecules (general formula) Na: 1.34 - 24.02%, Al: 2.20 - 39.51%, Si: 15.52 - 68.64% (general composition); additionally, depending on the water quality: Ca, Mg and K might be present below 6%

IUPAC Name:

Zeolite, cuboidal, crystalline, synthetic, non-fibrous

Test material form:

solid: particulate/powder

Remarks:

no surface treatment

Specific details on test material used for the study:

Name: Zeocros CG 180 (type P zeolite)
Batch no: 2020-531
Physical state: solid
Appearance: powder
Color: white
Odor: none
Appearance: powder
Composition: homogenous
CAS No: 1318-02-1
EINECS-No: 215-283-8 / 930-985-0
Molecular formula: Nax [(AlO2-)x (SiO2)x]y H2O
Molecular weight: not stated as UVCB
Purity: 100%
Homogeneity: homogenous
Vapour pressure: not volatile
Stability: stable at room temperature
Solubility: not stated
Production date: 16.11.2020
Expiry date: not stated
Storage: Room temperature (20 ± 5°C)

Data gathering

Instruments:

FL – 2500 Spectrofluorometer

Results and discussion

Any other information on results incl. tables

The PL spectra of the test item was remarkably broad - possibly due to the emission of defects. Without the filter used, the PL would have extended even further into the UV range. There was no consistent picture for the PLE spectra; they depended strongly on the selected detection window. That indicates, that in this case the excitation spectra of different defect states were observable, rather than the intrinsic PL. Ideally, the absorption edge should have been evident from the PLE spectra.

There was no absorption, but an increase in photoluminescence could be observed.

A photochemical reactivity of the material is not to be expected.

Applicant's summary and conclusion

Conclusions:

There was no absorption, but an increase in photoluminescence could be observed.
A photochemical reactivity of the material is not to be expected.

Executive summary:

This study was carried out to obtain information about the photochemical behavior of zeolites. For this purpose, Photoluminescence (PL) and photoluminescence excitation (PL)spectra were recorded. It was concluded that a photochemical reactivity of the material is not to be expected.