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Method for purifying tetracycline in sewage by photocatalysis method

A tetracycline and photocatalytic technology, applied in the field of environmental water treatment, can solve the problems of water environmental ecosystem damage, breaking water body balance, low mechanization intensity, etc., and achieve efficient removal, convenient operation, and wide visible light range.

Inactive Publication Date: 2017-05-17
BEIJING NORMAL UNIVERSITY
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  • Description
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AI Technical Summary

Problems solved by technology

The long-term existence of tetracycline in large quantities will break the water balance and cause great damage to the water environment ecosystem
During the treatment process of Fenton oxidation technology, since ferrous ions are easy to form iron hydroxide precipitates under alkaline conditions, tetracycline can only be degraded under specific pH conditions. In addition, the actual treatment of high-concentration tetracycline wastewater still remains There is room for improvement
The electrochemical oxidation technology has the disadvantages of high energy consumption and low mechanization intensity in the treatment

Method used

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  • Method for purifying tetracycline in sewage by photocatalysis method

Examples

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Effect test

Embodiment 1

[0033] Measure 100 milliliters of tetracycline-contaminated sewage with a tetracycline concentration of 5 mg / liter and place it in a 150 milliliter glass beaker, add 25 milligrams of (CuAg) 0.15 In 0.3 Zn 1.4 S 2 Quaternary sulfide visible light catalyst. The above mixed system was ultrasonically dispersed for 5 minutes in the dark to completely disperse the photocatalyst in the solution. Before irradiation, the mixed solution was placed on a magnetic stirrer to start stirring (800 rpm), and kept away from light for 20 minutes to achieve the adsorption-desorption equilibrium of tetracycline on the surface of the photocatalyst. Then irradiate with a xenon lamp (500 watts, 300-800 nm) at 800 rpm, and the temperature of the reaction solution is kept at (20±2)° C. by a water bath. Take 1 ml of samples regularly, centrifuge to get the supernatant, and use HPLC to analyze the concentration of tetracycline after sampling. After 3 hours, the removal rate of tetracycline in water ...

Embodiment 2

[0035] Measure 100 milliliters of tetracycline-contaminated sewage with a tetracycline concentration of 10 mg / liter and place it in a 150 milliliter glass beaker, add 25 milligrams of (CuAg) 0.15 In 0.3 Zn 1.4 S 2 Quaternary sulfide visible light catalyst. The above mixed system was ultrasonically dispersed for 5 minutes in the dark to completely disperse the photocatalyst in the solution. Before irradiation, the mixed solution was placed on a magnetic stirrer to start stirring (800 rpm), and kept away from light for 20 minutes to achieve the adsorption-desorption equilibrium of tetracycline on the surface of the photocatalyst. Then irradiate with a xenon lamp (500 watts, 300-800 nm) at 800 rpm, and the temperature of the reaction solution is kept at (20±2)° C. by a water bath. Take 1 ml of samples regularly, centrifuge to get the supernatant, and use HPLC to analyze the concentration of tetracycline after sampling. The method can remove 89.5% of tetracycline in water aft...

Embodiment 3

[0037] Measure 100 milliliters of tetracycline-contaminated sewage with a tetracycline concentration of 15 mg / liter and place it in a 150 milliliter glass beaker, add 25 milligrams of (CuAg) 0.15 In 0.3 Zn 1.4 S 2 Quaternary sulfide visible light catalyst. The above mixed system was ultrasonically dispersed for 5 minutes in the dark to completely disperse the photocatalyst in the solution. Before irradiation, the mixed solution was placed on a magnetic stirrer to start stirring (800 rpm), and kept away from light for 20 minutes to achieve the adsorption-desorption equilibrium of tetracycline on the surface of the photocatalyst. Then irradiate with a xenon lamp (500 watts, 300-800 nm) at 800 rpm, and the temperature of the reaction solution is kept at (20±2)° C. by a water bath. Take 1 ml of samples regularly, centrifuge to get the supernatant, and use HPLC to analyze the concentration of tetracycline after sampling. The method can remove 82.6% of tetracycline in water aft...

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Abstract

The invention relates to a method for treating sewage by a photocatalysis method, in particular to a method using (CuAg)0.15In0.3Zn1.4S2 quaternary sulfide as a photocatalyst to purify tetracycline in water under the simulated sun light radiation condition, which aims at solving the problems of higher cost and lower removal rate in the existing water tetracycline removal method. The method comprises the following steps of 1, mixing and stirring a photocatalyst and to-be-treated tetracycline sewage; 2, magnetically stirring to reach adsorption balance; 3, using a xenon lamp to radiate the sewage; 4, recycling the photocatalyst. Proved by tetracycline photocatalysis degrading results, the method has the advantages that the tetracycline in the water can be purified at high efficiency; the energy consumption is low, the operation is simple, the purifying ability is high, the reaction condition is moderate, and the like; the flow process is short, the equipment is simple, the tetracycline purifying effect is good, and the broad industrial application prospect is realized.

Description

technical field [0001] The invention relates to a method for purifying tetracycline in water, specifically a method for using (CuAg) 0.15 In 0.3 Zn 1.4 S 2 The quaternary sulfide is a method for photocatalyst to purify tetracycline in sewage under the condition of simulating sunlight irradiation, and belongs to the field of environmental water treatment. Background technique [0002] Tetracycline is a common compound in drugs and personal care products. It has strong biological activity, optical rotation and polarity. It is a typical bactericidal drug and is widely used in the treatment of human diseases and the prevention of bacterial diseases in poultry and livestock. One of the main sources of tetracycline is pharmaceutical wastewater, which is discharged into surface water after incomplete treatment, thereby polluting natural water bodies. In recent years, tetracycline has been detected in sewage and surface water in my country, Europe, the United States and other co...

Claims

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Application Information

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IPC IPC(8): C02F1/30C02F1/36C02F1/72C02F101/34C02F101/36C02F101/38
CPCY02W10/37C02F1/30C02F1/36C02F1/725C02F2101/34C02F2101/36C02F2101/38C02F2305/023C02F2305/10
Inventor 李阳赵俭商恩香庞文
Owner BEIJING NORMAL UNIVERSITY
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