Method for treating polluted composition

Patent metadata

Field	Value
Publication number	US-12017925-B2
Application number	US-202318213519-A
Country	US
Kind code	B2
Filing date	Jun 23, 2023
Priority date	Sep 25, 2019
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

A method for producing crystalline α-Fe 2 O 3 nanoparticles involving ultrasonic treatment of a solution of an iron (III)-containing precursor and an extract from the seeds of a plant in the family Linaceae. The method involves preparing an aqueous extract from the seeds of a plant in the family Linacae and dropwise addition of the extract to the solution of an iron (III)-containing precursor. The method yields crystalline nanoparticles of α-Fe 2 O 3 having a spherical morphology with a diameter of 100 nm to 300 nm, a mean surface area of 240 to 250 m 2 /g, and a type-II nitrogen adsorption-desorption BET isotherm with a H3 hysteresis loop. A method for the photocatalytic decomposition of organic pollutants using the nanoparticles is disclosed. An antibacterial composition containing the crystalline α-Fe 2 O 3 nanoparticles is also disclosed.

First claim

The invention claimed is:

1. A method for the photodegradation of an organic pollutant comprising:
mixing crystalline nanoparticles of α-Fe 2 O 3 with a treatment solution containing at least one organic pollutant selected from the group consisting of a dye, a phenol, and a polycyclic aromatic hydrocarbon, and a solvent to form a treatment composition; and
irradiating the treatment composition with visible light to photodegrade the organic pollutant and form an exposed composition; then
separating a solid product containing the crystalline nanoparticles of α-Fe 2 O, from the exposed composition and form a purified solution;
wherein the crystalline nanoparticles of α-Fe 2 O; are spherical with a diameter from 50 to 500 nm and have an average sphericity of greater than 0.94 or a cross-section or projection with an average circularity of greater than 0.94;
wherein the crystalline nanoparticles of α-Fe 2 O 3 have a band gap of 2.10 to 2.16 eV, a surface area of 240 to 260 m 2 /g, a Type II BET nitrogen adsorption-desorption curve with a H3 hysteresis loop, and a mean pore size of 7.25 to 9.25 nm.

2. The method of claim 1 , wherein the nanoparticles of α-Fe 2 O 3 are monodisperse, having a coefficient of variation defined as the ratio of a standard deviation of diameters to an average diameter of less than 0.15%.

3. The method of claim 1 , wherein the nanoparticles of α-Fe 2 O 3 are present in the solution in an amount of 0.5 to 1.5 g/L.

4. The method of claim 1 , further comprising:
forming the crystalline nanoparticles of α-Fe 2 O 3 by:
ultrasonically treating a nanoparticle synthesis solution comprising an iron (III)-containing precursor and a Linaceae seed extract derived from a seed from a plant in the family Linaceae to form a nanoparticle suspension; and
recovering the crystalline α-Fe 2 O 3 nanoparticles from the nanoparticle suspension.

5. The method of claim 4 , further comprising:
forming the Linaceae seed extract by:
boiling or steeping powdered seeds from the plant in the family Linaceae in water to produce a seed extract suspension; and
filtering or otherwise removing solid particles from the seed extract suspension to produce the Linaceae seed extract.

6. The method of claim 5 , wherein the Linaceae seed extract comprises:
at least 4 of compounds selected from the group consisting of dihydroxyacetone, 2,2′-oxybisethanol, glycerin, 2-hydroxy-gamma-butyrolactone, maltol, and 3-deoxy-d-mannoic lactone; and either cyclohexylmethyl hexadecyl ester or sucrose.

7. The method of claim 4 , wherein the iron (III)-containing precursor used to make the crystalline nanoparticles is iron (III) nitrate.

8. The method of claim 4 , comprising:
sonicating the nanoparticle synthesis solution at 45 kHz and 30 to 90 W.

Assignees

• Univ Imam Abdulrahman Bin Faisal

Inventors

• Mohamed Hanan Hussein Amin

Classifications

• B01J2235/15

  X-ray diffraction · CPC title

• B01J2235/10

  Infrared [IR] · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J35/45

  Nanoparticles · CPC title