Method for degrading fluoroquinolone antibiotics by activating peroxyacetic acid with lanthanum ruthenate perovskite

Patent metadata

Field	Value
Publication number	US-10850998-B2
Application number	US-201916365678-A
Country	US
Kind code	B2
Filing date	Mar 27, 2019
Priority date	Dec 29, 2018
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

A method for treating wastewater containing fluoroquinolone antibiotics by activating peroxyacetic acid heterogeneously with lanthanum ruthenate perovskite (LaRuO 3 ) catalyst. The method includes: adding peroxyacetic acid to wastewater containing ciprofloxacin, mixing to obtain a peroxyacetic acid solution, adjusting a pH of the peroxyacetic acid solution; and adding lanthanum ruthenate perovskite to the peroxyacetic acid solution to obtain a mixed solution, and stirring the mixed solution in a constant temperature shaker, and removing the ciprofloxacin at a normal temperature.

First claim

What is claimed is:

1. A method for degrading fluoroquinolone antibiotics by activating peroxyacetic acid, comprising the following steps:
(1) adding peroxyacetic acid to wastewater containing ciprofloxacin, mixing to obtain a peroxyacetic acid solution, adjusting a pH of the peroxyacetic acid solution; and
(2) adding lanthanum ruthenate perovskite to the peroxyacetic acid solution obtained in step (1) to obtain a mixed solution, and stirring the mixed solution in a constant temperature shaker, and removing the ciprofloxacin.

2. The method according to claim 1 , wherein a method for preparing the lanthanum ruthenate perovskite comprises the following steps:
(1) according to a molar ratio of La:Ru:CA=1:(1-5):(2-6), respectively weighing La(NO 3 ) 3 .6H 2 O, RuCl 3 and C 6 H 8 O 7 .H 2 O for mixing in a beaker, and adding water for dissolving to obtain a solution, vigorously stirring the solution while heating the solution to a temperature of 65° C., subsequently, adding ethylene glycol and maintaining at the temperature until the solution becomes a viscous gelatinous substance due to a slow evaporation of water;
(2) transferring the beaker into a heating jacket for uniform heating, and raising the temperature to 120° C. and maintaining for 1-4 hours, wherein at this time, obtaining a polymer having a 3D structure by reacting citric acid with the ethylene glycol;
(3) placing the beaker containing the polymer in an oven for a thorough drying at a temperature not lower than 100° C.; and
(4) after the thorough drying, pulverizing the polymer and then calcining at 800° C.-1000° C. for 6-9 hours to decompose the polymer and obtain the lanthanum ruthenate perovskite.

3. The method according to claim 1 , wherein a concentration of the ciprofloxacin in the wastewater is less than 200 mg/L.

4. The method according to claim 1 , wherein a mass ratio of the peroxyacetic acid to the ciprofloxacin is controlled at 1:2-10:1.

5. The method according to claim 1 , wherein adjusting the pH of the peroxyacetic acid solution includes adjusting the pH of the peroxyacetic acid solution to 3-9 with sulfuric acid or sodium hydroxide.

6. The method according to claim 1 , wherein an additive amount of the lanthanum ruthenate perovskite is 0.5-2 g/L.

7. The method according to claim 1 , wherein reaction time of the mixed solution when stirred in the constant temperature shaker is 1-30 minutes.

Assignees

• Univ Tongji

Inventors

• Zhou Xuefei
• Zhang Yalei
• Chen Jiabin
• Zhang Longlong
• Chu Huaqiang
• Guo Huichao

Classifications

• C02F2101/38

  containing nitrogen · CPC title

• C02F2103/026

  Treating water for medical or cosmetic purposes · CPC title

• C02F2101/36

  containing halogen · CPC title

• C02F9/00 Primary

  Multistage treatment of water, waste water or sewage · CPC title

• C02F1/722

  Oxidation by peroxides · CPC title