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Method for catalytic degradation of antibiotics by nitrogen-doped modified nano titanium dioxide and evaluation method

A nano-titanium dioxide, catalytic degradation technology, applied in chemical instruments and methods, physical/chemical process catalysts, other chemical processes, etc., can solve the problems of incomplete removal of ciprofloxacin and secondary pollution, and achieve no secondary pollution. , good stability, the effect of reducing production costs

Inactive Publication Date: 2020-01-10
NANJING AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that conventional methods in the prior art cannot completely remove ciprofloxacin, and also cause secondary pollution; the present invention provides a method for catalytically degrading antibiotics containing nitrogen-doped modified nano-titanium dioxide, and the result It is shown that nitrogen-doped modified nano-titanium dioxide has a significant degradation effect on ciprofloxacin, and the degradation rate of ciprofloxacin can reach more than 95% in a short period of time, and the catalytic material has high stability and can be recycled and repeated. use

Method used

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  • Method for catalytic degradation of antibiotics by nitrogen-doped modified nano titanium dioxide and evaluation method
  • Method for catalytic degradation of antibiotics by nitrogen-doped modified nano titanium dioxide and evaluation method
  • Method for catalytic degradation of antibiotics by nitrogen-doped modified nano titanium dioxide and evaluation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Experimental materials

[0040] 1.1 Experimental reagents

[0041] Table 1-1 Main chemical reagents

[0042]

[0043] 1.2 Experimental instruments and equipment

[0044] Table 1-2 Main instruments and equipment

[0045]

[0046] 2. Experimental part

[0047] S01 dissolves 5 mg of ciprofloxacin in pure water to prepare a 5 mg / L ciprofloxacin solution;

[0048] S02 Take out 1L of the ciprofloxacin solution in step S01, adjust the pH value to 7.5, and calcinate the nano-TiO in a muffle furnace at 500°C with a mass ratio of urea / titanium dioxide of 1:1. 2 Add the photocatalyst to the ciprofloxacin solution, and turn on the magnetic stirrer to stir at the same time. The stirring time is 30min, and the reaction temperature is 25°C, so that the catalyst and the target pollutant reach the adsorption-desorption equilibrium. After the degradation is completed, the nano-TiO is recovered by filtration. 2 Photocatalyst and cleaning wastewater. Ciprofloxacin in clean w...

Embodiment 2

[0050] The difference between this embodiment and embodiment 1 is that for nano-TiO 2 The effect of the dosage on photocatalytic degradation was investigated:

[0051] By studying different nano-TiO 2 Dosage (0, 0.2, 0.4, 0.6, 0.8g.L -1 ) in the photocatalytic degradation experiment under the condition of nano-TiO 2 The effect of dosage on the reaction rate. The experimental conditions are as follows: the temperature is 25° C., the concentration of ciprofloxacin is 5 mg / L, and the initial pH of the reaction solution is 7.5.

[0052] The results of the study were:

[0053] Nano-TiO 2The dosage is 0, 0.2, 0.4, 0.6, 0.8g / L respectively. Depend on figure 1 It can be seen that when no photocatalyst is added, ciprofloxacin basically does not decrease, indicating that the degradation effect of the other four groups is mainly due to the nano-TiO 2 . Among the other four groups, the catalyst dosage of 0.4g / L had the best degradation effect. The reason may be that when the dos...

Embodiment 3

[0055] The difference between this embodiment and Example 1 is that the initial pH of the solution is investigated on the influence of the photocatalytic degradation of ciprofloxacin:

[0056] The effect of pH value on the reaction rate was studied in the catalytic degradation experiments under the conditions of different initial pH (3.5, 5.5, 7.5, 10.5) of the solution. The test conditions are as follows: the temperature is 25°C, the dosage is 0.4g / L, and the concentration of ciprofloxacin is 5mg / L.

[0057] The result is:

[0058] Regulating the initial pH of ciprofloxacin solution is 3.5,5.5,7.5,10.5, and the dosage of catalyst is 0.4g / L, figure 2 Indicates the effect of materials on the photocatalytic degradation of ciprofloxacin under different initial pH conditions. Such as figure 2 As shown, the initial pH of the solution increased continuously, but the degradation rate first increased and then decreased. And when the pH of the initial solution of ciprofloxacin is...

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Abstract

Belonging to the technical field of organic sewage control, the invention particularly discloses a method for catalytic degradation of antibiotics by nitrogen-doped modified nano titanium dioxide andan evaluation method. The method for catalytic degradation of antibiotics by nitrogen-doped modified nano titanium dioxide provided by the invention has a remarkable degradation effect on ciprofloxacin, and the catalytic material has high stability and can be recycled. The evaluation method for the catalytic degradation of antibiotics by nitrogen-doped modified nano titanium dioxide provided by the invention can determine the catalytic efficiency of the catalytic material, and determine the stability, reusability and adsorption kinetics of the catalytic material, thus laying a solid research foundation for practical application of nitrogen-doped modified nano titanium dioxide.

Description

technical field [0001] The invention belongs to the technical field of organic sewage prevention and control, and in particular relates to a method and an evaluation method for catalytically degrading antibiotics by nitrogen-doped modified nano-titanium dioxide. Background technique [0002] Ciprofloxacin is a synthetic third-generation fluoroquinolone antibiotic, mainly used for sexually transmitted diseases, urinary tract infections and skin infections. Most fluoroquinolone antibiotics cannot be completely metabolized in the human body, and will be excreted as metabolites and flow into sewage treatment plants with sewage. Traditional biological wastewater treatment methods do not completely remove these antibiotics, so they may have long-term damaging effects on ecosystems and human health. Therefore, it is urgent to remove the pollution caused by ciprofloxacin in water. We can remove ciprofloxacin in water through different physical and chemical methods, such as adsorpt...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J21/06B01J20/06C02F1/28C02F1/30B01J20/30C02F101/38C02F101/36C02F101/34
CPCB01J27/24B01J21/063B01J20/0259B01J20/06C02F1/281C02F1/30C02F2101/38C02F2101/36C02F2101/34C02F2305/10B01J35/39
Inventor 于洪霞罗静怡蔡天明陈立伟姜灿烂丁大虎陆玲丽张天宇张嘉琪
Owner NANJING AGRICULTURAL UNIVERSITY
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