Method for treating tetracycline waste water with iron-modified attapulgite adsorbent

A technology of attapulgite and adsorbent, which is applied in the field of adsorption and removal of tetracycline compounds in medical sewage, and achieves the effects of simple operation process, good economic and environmental benefits, and high adsorption efficiency

Inactive Publication Date: 2012-07-04
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current literature has reported that attapulgite can remove COD from sewage, the removal rate can be as high as 90%, some even reach 100%, and the

Method used

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  • Method for treating tetracycline waste water with iron-modified attapulgite adsorbent
  • Method for treating tetracycline waste water with iron-modified attapulgite adsorbent
  • Method for treating tetracycline waste water with iron-modified attapulgite adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Weigh 5g of the purified attapulgite into a 500mL beaker, add 250mL of distilled water, stir magnetically for 0.5h, then add 0.724g of FeCl 3 ·6H 2 O (equivalent to 0.15gFe), magnetic stirring for 30min, to ensure that FeCl 3 ·6H 2 Dissolve O completely, adjust the pH value to 7, continue stirring for 1 hour, centrifuge and wash for 3 times, then dry at 40°C for 36-48 hours, grind to a particle size of ≤100 mesh, and obtain an iron-modified attapulgite adsorbent.

[0049] Accurately weigh 0.1000g (±0.0005g) of the iron-modified attapulgite adsorbent, place it in a 250mL conical flask with a stopper, add 20mL of tetracycline solution with a concentration of 100mg / L, place it in a constant temperature oscillator, and Oscillate at a rate of 150r / min at 25°C, take the supernatant and pass through a 0.45μm microporous membrane at 1h, 3h, 6h, 12h, and 24h respectively, and test the residual tetracycline concentration by liquid chromatography. The groups are parallel, and t...

Embodiment 2

[0052] The iron-modified attapulgite adsorbent was prepared in the same manner as in Example 1.

[0053] Accurately weigh 0.1000g (±0.0005g) of the iron-modified attapulgite adsorbent, place it in a 250mL conical flask with a stopper, add 20mL of tetracycline solutions with concentrations of 10, 20, 50, and 100 mg / L, respectively, and place In a constant temperature oscillator, oscillate at a rate of 150r / min at 25°C for 24h to reach adsorption equilibrium, take the supernatant and pass it through a 0.45μm microporous membrane, and test the concentration of residual tetracycline by liquid chromatography. The groups are parallel, and the results are expressed as arithmetic mean, and the standard deviation is calculated to ensure the test accuracy. After calculation, the adsorption and removal rates of tetracycline were 100.0%, 99.4%, 99.4%, and 98.7%, respectively. attached figure 2 , The effect of the initial concentration of tetracycline on the adsorption removal rate.

...

Embodiment 3

[0056] The iron-modified attapulgite adsorbent was prepared in the same manner as in Example 1.

[0057] Accurately weigh 0.1000g (±0.0005g) of the iron-modified attapulgite adsorbent, place it in a 250mL conical flask with a stopper, add 20mL of tetracycline solution with a concentration of 100mg / L, place it in a constant temperature oscillator, and Oscillate at a rate of 150r / min for 24 hours at 5, 15, 25, and 40°C until the adsorption equilibrium is reached, and the supernatant is passed through a 0.45 μm microporous membrane, and the residual tetracycline concentration is tested by liquid chromatography, with three settings for each experiment. The groups are parallel, and the results are expressed as arithmetic mean, and the standard deviation is calculated to ensure the test accuracy. After calculation, the adsorption and removal rates of tetracycline were 96.6%, 97.4%, 98.7%, and 99.7%, respectively. attached image 3 , the effect of temperature on the adsorption remo...

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Abstract

The invention relates to a method for treating tetracycline waste water with an iron-modified attapulgite adsorbent, which is characterized in that concentration of tetracycline in the waste water is 5-150mg/L. The iron-modified attapulgite adsorbent is added in the tetracycline waste water, and mass ratio of the tetracycline waste water to the adsorbent is 1: (4-6). The adsorption process adopts a static mode of action and/or an oscillating and stirring mode of action at the temperature of 0-50 DEG C. The method aims at the waste water polluted by tetracycline and removes tetracycline by adding the iron-modified attapulgite adsorbent in the waste water for adsorption. The method has the advantages of having high adsorption efficiency for tetracycline compounds, simple operational process, low requirements for adsorption conditions, low cost of adsorption materials and high regeneration efficiency and being easy to popularize. The method is used for removing tetracycline compounds in a water body and has good economic and environmental benefits.

Description

technical field [0001] The invention relates to an adsorption treatment method for tetracycline compounds in wastewater, in particular to a method for adsorbing and removing tetracycline compounds in medical sewage by using an iron-modified attapulgite adsorbent. Background technique [0002] Tetracycline antibiotics (tetracycline antibiotics, TCs, hereinafter referred to as tetracyclines) are a class of broad-spectrum antibiotics produced by Streptomyces, which are used frequently and widely. According to reports, the production and usage of such antibiotics ranks second in the world, and China ranks first. Tetracyclines include natural tetracyclines and semi-synthetic tetracyclines. Natural tetracyclines are extracted from the culture fluid of Streptomyces, and tetracycline (Tetracycline) is a kind of natural tetracyclines. It has a broad antibacterial spectrum and is active against microorganisms such as Gram-positive and Gram-negative bacteria, mycoplasma, rickettsia an...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/58B01J20/12B01J20/30B01J20/34
Inventor 王金生李剑鲍文菊
Owner BEIJING NORMAL UNIVERSITY
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