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.
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[0032] Example 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 te...
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[0034] Example 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 tetra...
Example Embodiment
[0036] Example 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 tetra...
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