Refractory organic pollutants with photo- excited holes as electron acceptors

Patent metadata

Field	Value
Publication number	US-12497312-B2
Application number	US-202017798210-A
Country	US
Kind code	B2
Filing date	Dec 3, 2020
Priority date	Jul 22, 2020
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

Abstract

The present invention relates to the technical field of wastewater treatment, and discloses a method for enhanced bio-treatment of refractory organic pollutants with photo-excited holes as electron acceptors. The method comprises the following steps: 1) placing a composite semiconductor-coated carrier material into a reactor, introducing wastewater into the reactor inoculated with anaerobic sludge, and allowing the composite semiconductor-coated carrier material to be immersed in the wastewater, wherein the composite semiconductor-coated carrier material comprises a conductive carrier and composite semiconductor materials loaded on the conductive carrier; 2) carrying out habituated culture on the anaerobic sludge for a period of time, and loading a biological membrane on the surface of the composite semiconductor materials, to construct a photo-excited hole enhanced bioreactor; and 3) treating the refractory pollutants in the wastewater by utilizing the reactor under irradiation.

First claim

What is claimed is:

1 . A method for enhanced bio-treatment of refractory organic pollutants with photo-excited holes as electron acceptors, comprising the following steps:
1-1) placing a composite semiconductor-coated carrier material into a reactor, introducing wastewater into the reactor inoculated with anaerobic sludge, and allowing the composite semiconductor-coated carrier material to be immersed in the wastewater, wherein the composite semiconductor-coated carrier material comprises a conductive carrier and composite semiconductor materials loaded on the conductive carrier, wherein the composite semiconductor materials comprise BiVO 4 /FeOOH; 1-2) carrying out habituated culture on the anaerobic sludge for a period of time, and loading a biological membrane on a surface of the composite semiconductor-coated carrier material, to construct a photo-excited hole-enhanced bioreactor; and 1-3) treating the refractory pollutants in the wastewater by utilizing the reactor under irradiation, wherein the conductive carrier comprises carbon paper, and the reactor comprises a quartz reactor or a glass reactor, wherein the composite semiconductor-coated carrier material comprises BiVO 4 /FeOOH@CP, and wherein the BiVO 4 /FeOOH@CP is prepared through a method comprising: preparing BiOI@CP by electrodeposition, converting the BiOI@CP into BiVO 4 @CP, immersing the BiVO 4 @CP in a solution of FeCl 3 ·6H 2 O for a period of time, and rinsing with deionized water, to obtain the BiVO 4 /FeOOH@CP.

2 . The method for enhanced bio-treatment of refractory organic pollutants with photo-excited holes as electron acceptors according to claim 1 , wherein the anerobic sludge is inoculated at a concentration of about 3.0-6.0 g/L, and the anaerobic sludge is subjected to habituated culture for at least 30 days.

3 . The method for enhanced bio-treatment of refractory organic pollutants with photo-excited holes as electron acceptors according to claim 1 , wherein the electrodeposition comprises the following steps:
7-1) dissolving Bi(NO 3 ) 3 ·5H 2 O and KI in deionized water; adjusting the pH with nitric acid, and mixing the solution with a solution of p-benzoquinone in ethanol for a period of time, to obtain a mixture; and 7-2) adding the mixture to a three-electrode system, and electrodepositing at a cathodic potential for a period of time, to deposit BiOI onto carbon paper, so as to form the BiOI@CP.

4 . The method for enhanced bio-treatment of refractory organic pollutants with photo-excited holes as electron acceptors according to claim 3 , wherein the BiOI@CP is converted into the BiVO 4 @CP through steps comprising:
8-1) coating a VO(acac) 2 /DMSO solution onto the BiOI@CP, heating to a certain temperature at a certain heating rate and holding for a period of time; and 8-2) treating with NaOH to remove excess V 2 O 5 , to obtain the BiVO 4 @CP.

5 . The method for enhanced bio-treatment of refractory organic pollutants with photo-excited holes as electron acceptors according to claim 1 , wherein the wastewater comprises refractory organic pollutants, Na 2 HPO 4 ·12H 2 O, KH 2 PO 4 , MgSO 4 ·7H 2 O, CaCl 2 , and a mixed solution of trace elements.

6 . The method for enhanced bio-treatment of refractory organic pollutants with photo-excited holes as electron acceptors according to claim 5 , wherein the refractory organic pollutants comprise nitrogen-containing heterocyclic organic compounds, chlorinated organic compounds and antibiotic organic compounds.

7 . The method for enhanced bio-treatment of refractory organic pollutants with photo-excited holes as electron acceptors according to claim 2 , wherein the electrodeposition comprises the following steps:
7-1) dissolving Bi(NO 3 ) 3 ·5H 2 O and KI in deionized water; adjusting the pH with nitric acid, and mixing the solution with a solution of p-benzoquinone in ethanol for a period of time, to obtain a mixture; and 7-2) adding the mixture to a three-electrode system, and electrodepositing at a cathodic potential for a period of time, to deposit BiOI onto carbon paper, so as to form the BiOI@CP.

Assignees

• Univ Nanjing Sci & Tech

Inventors

• Jiang Xinbai
• Shi Hefei
• Shen Jinyou
• Chen Dan
• Hou Cheng

Classifications

• C25D9/08 Primary

  by cathodic processes · CPC title

• C02F2305/10

  Photocatalysts · CPC title

• C02F2101/38

  containing nitrogen · CPC title

• C02F2101/36

  containing halogen · CPC title

• C02F3/2806

  Anaerobic processes using solid supports for microorganisms · CPC title