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Method for treating tetracycline and ciprofloxacin single and compound polluted water by using modified graphene oxide

A technology of stone oxide and graphene, applied in chemical instruments and methods, water pollutants, alkali metal compounds, etc., can solve the problems of difficult separation and limited adsorption sites of graphene oxide, and achieve low product toxicity and good adsorption effect. , the effect of simple preparation process

Inactive Publication Date: 2018-04-20
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene oxide has limited adsorption sites and is very difficult to separate from aqueous solutions.

Method used

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  • Method for treating tetracycline and ciprofloxacin single and compound polluted water by using modified graphene oxide
  • Method for treating tetracycline and ciprofloxacin single and compound polluted water by using modified graphene oxide
  • Method for treating tetracycline and ciprofloxacin single and compound polluted water by using modified graphene oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 5~6g graphite powder, 4~6gK 2 S 2 o 8 , 4~6gP 2 o 5 and 20-30mL of 98% H 2 SO 4 Add it to a 1L Erlenmeyer flask, and stir in a 70-100°C water bath for 4-6 hours. Cool to room temperature, then add 0.5-2L ultrapure water to dilute and leave overnight. The supernatant was discarded, and the mixture was filtered and washed with deionized water until neutral. Oven drying at 50-60°C to obtain pre-oxidized graphite. Add the obtained pre-oxidized graphite into the Erlenmeyer flask, and then add 200-260mL of 98% H 2 SO 4 solution, while stirring, add 4 ~ 6g NaNO 3 , 25~35gKMnO 4 (Potassium permanganate is slowly added to the mixed solution with a medicine spoon), stirred and reacted in an ice bath for 3 to 6 hours. Then raise the temperature to 30-40°C for 1-2.5 hours, slowly add 400-700mL of ultra-pure water with a drop bottle and react at 90-100°C for 1-2 hours, after the mixture is cooled to room temperature, use 1-2L to remove Dilute with deionized water, add 3...

Embodiment 2

[0024] In TC and CIP solutions with different pH values, add the above-mentioned DTPA-modified magnetic graphene oxide composite material, comprising the following steps:

[0025] Add 2.30mg of DTPA-modified magnetic graphene oxide composite material to 25mL 50mg / L TC and 50mg / L CIP solutions respectively, adjust the pH to 2.0-10.0, and carry out oscillation adsorption reaction in a water bath constant temperature oscillator at 30°C. After 24 hours, pass The magnet separates the adsorbent from the waste water, and measures the content of unadsorbed TC and CIP in the waste water at 357 and 276 nm with a UV spectrophotometer. The calculated adsorption results are shown in Table 1:

[0026] Table 1: Adsorption data of adsorbents for TC and CIP under different pH conditions

[0027]

[0028] It can be seen from Table 1 that with the increase of pH, the adsorption capacity of the adsorbent to tetracycline and ciprofloxacin first increases and then decreases, indicating that pH p...

Embodiment 3

[0030] Add 0-20mg / L CIP to the 50mg / L TC solution, add 0-20mg / L TC to the 50mg / L CIP, and then add the above-mentioned DTPA-modified magnetic graphene oxide composite material, including the following steps:

[0031] Add 0-20mg / L CIP to the TC solution with an initial concentration of 50mg / L, and add 0-20mg / L TC to the CIP solution with an initial concentration of 50mg / L, and add 2.30mgDTPA to the two mixed solutions to modify magnetic graphene oxide composites. Oscillating adsorption reaction was carried out in a constant temperature oscillator in a water bath at 30°C. After 24 hours, the adsorbent was separated from the wastewater by a magnet, and the content of unadsorbed TC and CIP in the wastewater was measured at 357 and 276 nm with a UV spectrophotometer, and calculated. The adsorption capacity results are shown in Table 2:

[0032] Table 2: Adsorption data of tetracycline by adsorbent at different CIP concentrations

[0033] Concentration of CIP (mg / L)

[0...

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Abstract

The invention provides a method for adsorbing and removing TC (tetracycline) and CIP (ciprofloxacin) single and compound polluted water by using a DTPA modified magnetic graphene oxide composite. Theexperiment result shows that the mass of the TC exchanged through each gram of adsorbent in the single antibiotic water is near to hundreds of milligrams, the mass of the exchanged CIP is up to more than 100 milligrams, the adsorbing effects of the DTPA modified magnetic graphene oxide on the TC and the CIP are both quite excellent, and meanwhile, the solid and the liquid can be well separated after the adsorption. The influence of the competitive adsorption on the ciprofloxacin is relatively weak in the compound polluted water, and a new thought is provided for the removal of the ciprofloxacin in the compound polluted water. Compared with the prior art, the treatment method is simple, the material preparation cost and the operation are low, a new way is provided for the treatment of the pollution of antibiotics in the wastewater, and the method can be popularized in the treatment of the antibiotic pollution as a novel adsorbent.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and new water treatment technologies, and in particular relates to a method for treating tetracycline and ciprofloxacin single and compound polluted water bodies with graphene oxide modified by diethylene triamine pentaacetic acid. Background technique [0002] As one of the most common organic compounds in sewage, antibiotics are considered as persistent pollutants, which can lead to changes in animal and human resistance genes, thereby inhibiting the activity of antibiotics against diseases and interfering with the growth of plants, animals and microorganisms. The antibiotics left in the environment have very weak degradation ability under natural conditions. Therefore, effective treatment technologies need to be studied to treat antibiotic-contaminated water sources. Tetracycline (TC) and ciprofloxacin (CIP), two antibiotics widely used in humans and animals, are frequently de...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/22C02F1/28C02F1/48C02F101/34C02F101/36C02F101/38
CPCB01J20/20B01J20/22B01J20/28007B01J20/28009C02F1/28C02F1/281C02F1/285C02F1/48C02F2101/34C02F2101/36C02F2101/38
Inventor 李美芳刘云国舒鼎刘少博曾光明胡新将谭小飞江卢华刘妮王胜凡
Owner HUNAN UNIV
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