Method for using photocatalytic reduction to treat waste water containing nitroimidazole antibiotics

A technology of antibiotic wastewater and nitroimidazole, which is applied in the direction of reduced water/sewage treatment, light water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of poor degradation of nitroimidazole antibiotics and achieve external interference The effect of small factors and high degradation efficiency

Inactive Publication Date: 2015-08-12
GUANGXI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a photocatalytic reduction method for treating wastewater containing nitroimidazole antibiotics, thereby overcoming the disadvantage of poor degradation of nitroimidazole antibiotics contained in wastewater, and providing a method that can efficiently degrade nitroimidazole antibiotics in wastewater. imidazole antibiotic approach

Method used

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  • Method for using photocatalytic reduction to treat waste water containing nitroimidazole antibiotics
  • Method for using photocatalytic reduction to treat waste water containing nitroimidazole antibiotics
  • Method for using photocatalytic reduction to treat waste water containing nitroimidazole antibiotics

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Embodiment 1

[0023] (1) Take 180mL of Dimetazole solution with a concentration of 40mg / L and add it to the quartz reactor as simulated wastewater, and add 180mg of titanium dioxide TiO 2 , then add 10mmol / L oxalic acid, adjust the pH value of the solution to 2.5 with HCl and NaOH, feed nitrogen until the reactor is in an anaerobic state, carry out magnetic stirring, and react in the dark for 30min to reach adsorption equilibrium, then turn on the UV emission An ultraviolet lamp with a light wavelength of less than 400nm performs photocatalytic reduction to degrade Dimetazole.

[0024] (2) Samples were taken at 5min, 10min, 15min, 20min, 30min, 40min, 50min, and 60min of degradation, and were filtered by a 0.22 μm filter membrane at 309nm with an ultraviolet spectrophotometer (UV2450, Shimadzu International Trading (Shanghai) Co., Ltd.) The absorbance was measured at the wavelength, and it was obtained as figure 2 TiO in 2 +oxalic acid+N 2 Curve (Note: figure 2 Sampling time is 15min,...

Embodiment 2

[0026] (1) Adopt formic acid as reducing agent, repeat embodiment 1 step (1).

[0027] (2) Samples were taken at 5min, 10min, 15min, 20min, 30min, 40min, 50min, and 60min of degradation, and were filtered by a 0.22 μm filter membrane at 309nm with an ultraviolet spectrophotometer (UV2450, Shimadzu International Trading (Shanghai) Co., Ltd.) The absorbance was measured at the wavelength, and it was obtained as image 3 The formic acid curve in; Wherein, the measurement result, adopting formic acid as reducing agent reaches 98.3% to the removal rate of Dimetazole in the time of 40min, promptly degradation rate reaches 98.3%, and reaction rate is 0.0970min -1 .

Embodiment 3

[0029] (1) Adopt 40mg / L ronidazole solution 180mL as simulated waste water, repeat embodiment 1 step (1).

[0030] (2) Samples were taken at 5min, 10min, 15min, 20min, 30min, 40min, 50min, and 60min of degradation, and were filtered by a 0.22 μm filter membrane at 320nm with an ultraviolet spectrophotometer (UV2450, Shimadzu International Trading (Shanghai) Co., Ltd.) The absorbance was measured at the wavelength, and it was obtained as Figure 4 The oxalic acid curve in; Wherein, measurement result, adopting oxalic acid is that the removal rate of ronidazole reaches 96.4% when 60min, promptly degradation rate reaches 96.4%, and reaction rate is 0.0537min -1 .

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Abstract

The invention discloses a method for using photocatalytic reduction to treat waste water containing nitroimidazole antibiotics. The method includes: adding TiO2 into the waste water containing nitroimidazole antibiotics to serve as catalyst, adding organic acid to serve as reducing agent, adjusting the pH of the waste water to be 2-4, controlling a system to be under an oxygen-free condition, and using ultraviolet radiation to degrade the nitroimidazole antibiotics in the waste water. The method has the advantages that the fast opening and decomposition of the heterocyclic nitrogen in the nitroimidazole antibiotics can be achieved, so that the nitroimidazole antibiotics in the waste water can be effectively degraded; the method is high in degrading efficiency, low in external interference factor, and capable of fully utilizing the small-molecule organic acids, containing carboxylic acid functional groups, in the waste water.

Description

technical field [0001] The invention belongs to the technical field of chemical environmental protection, and relates to a method for photocatalytic reduction treatment of wastewater containing nitroimidazole antibiotics. Background technique [0002] In recent years, the environmental pollution and potential harm to human body caused by medicinal antibiotics have aroused great concern. The total annual production of antibiotics in the world is 100,000-200,000 tons. China is the world's largest producer and consumer of antibiotics, consuming up to 25,000 tons of antibiotics each year. Nitroimidazole antibiotics are a class of drugs widely used in the treatment of infectious diseases caused by anaerobic bacteria and protozoan infections, and are widely used in humans, poultry and fish. Such drugs have genotoxic, carcinogenic and mutagenic side effects, and are difficult to be decomposed by organisms. They can accumulate in large quantities in animals, and eventually endanger...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30C02F1/70C02F1/66
Inventor 喻泽斌陈冬梅胡晓孙蕾
Owner GUANGXI UNIV
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