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Preparation of modified magnetic zeolite imidazole framework material and adsorption of trace ceftazidime in water

A zeolite imidazole framework, magnetic technology, applied in the direction of adsorption water/sewage treatment, water pollutants, other chemical processes, etc. smooth surface effect

Inactive Publication Date: 2020-11-06
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with other methods, the activated sludge method can remove a large number of common organic pollutants in water by using microorganisms, but the removal effect of complex refractory organic substances such as trace antibiotics in water is not ideal; advanced oxidation technology has by-products risk, while the membrane technology is easily polluted, the concentrate is difficult to handle, and is greatly affected by pH; while the adsorption method is flexible, simple, high removal rate, wide application range, repeated use and no secondary pollution, it is considered to be the most important application One of the most common and valuable pollutant removal technologies

Method used

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  • Preparation of modified magnetic zeolite imidazole framework material and adsorption of trace ceftazidime in water
  • Preparation of modified magnetic zeolite imidazole framework material and adsorption of trace ceftazidime in water
  • Preparation of modified magnetic zeolite imidazole framework material and adsorption of trace ceftazidime in water

Examples

Experimental program
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Effect test

example 1

[0013] Example 1. Weigh 50 ml ethanol, 10 ml deionized water, 10 ml (25%) ammonia water, 0.3 g Fe3O4, 20 ml TEOS, ultrasonicate in a water bath at 40°C and stir for 3 hours. After the reaction, filter the product and ultrasonicate it with deionized water and ethanol Washed three times, dried in a constant temperature drying oven at 60 °C for 12 h to obtain SiO2@Fe3O4 magnetic particles. Weigh 0.405g zinc nitrate hexahydrate, 0.2 gSiO2@Fe3O4, 20 ml methanol to prepare mixed methanol solution A; 0.265 g 2-methylimidazole, 0 mmol CTAB, 0 mmolSL, 20 ml methanol to prepare mixed methanol solution B; mix After stirring at room temperature for 6 h, the product was filtered and ultrasonically washed with deionized water and ethanol three times, dried at 80 °C for 12 h, calcined at 150 °C for 1 h under N2 environment, and then calcined at 500 °C for 2 h to remove the template agent. The product obtained after cooling down is ZIF-8@SiO2@Fe3O4. Add 1mg ZIF-8@SiO2@Fe3O4 to 200 ml of 1mg / ...

example 2

[0014] Example 2. Weigh 50 ml ethanol, 10 ml deionized water, 10 ml (25%) ammonia water, 0.3 g Fe3O4, 20 ml TEOS, ultrasonicate in a water bath at 40°C and stir for 3 hours. After the reaction, filter the product and ultrasonicate it with deionized water and ethanol Washed three times, dried in a constant temperature drying oven at 60 °C for 12 h to obtain SiO2@Fe3O4 magnetic particles. Weigh 0.425g zinc nitrate hexahydrate, 0.2 gSiO2@Fe3O4, 20 ml methanol to prepare mixed methanol solution A; 0.265 g 2-methylimidazole, 0.1mmolg CTAB, 0mmol SL, 20 ml methanol to prepare mixed methanol solution B; mix After stirring at room temperature for 6 h, the product was filtered and ultrasonically washed with deionized water and ethanol three times, dried at 80 °C for 12 h, calcined at 150 °C for 1 h under N2 environment, and then calcined at 500 °C for 2 h to remove the template agent. The product obtained after cooling down is ZIF-8@SiO2@Fe3O4. Add 1mg ZIF-8@SiO2@Fe3O4 to 200 ml of 1m...

example 3

[0015] Example 3. Weigh 50 ml ethanol, 10 ml deionized water, 10 ml (25%) ammonia water, 0.3 g Fe3O4, 20 ml TEOS, sonicate in a water bath at 40°C and stir for 3 hours. After the reaction, filter the product and sonicate it with deionized water and ethanol Washed three times, dried in a constant temperature drying oven at 60 °C for 12 h to obtain SiO2@Fe3O4 magnetic particles. Weigh 0.405g zinc nitrate hexahydrate, 0.2 gSiO2@Fe3O4, 20 ml methanol to prepare mixed methanol solution A; 0.265 g 2-methylimidazole, 0 mmol CTAB, 0.1 mmol SL, 20 ml methanol to prepare mixed methanol solution B; After mixing, stir at room temperature for 6 h. After the reaction, filter the product and ultrasonically wash it with deionized water and ethanol for 3 times, dry at 80°C for 12 h, calcinate at 150°C for 1 h under N2 environment, and then calcinate at 500°C for 2 h to remove the template. , the product obtained after cooling down is ZIF-8@SiO2@Fe3O4. Add 1mg ZIF-8@SiO2@Fe3O4 to 200 ml of 1mg...

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Abstract

The invention discloses a preparation method of a pore-channel-modified magnetic zeolite imidazole framework material adsorbent (ZIF-8@SiO2-Fe3O4). According to the method, zinc nitrate hexahydrate isused as a metal source, 2-methylimidazole is used as an organic ligand, methanol is used as a reaction solvent, cetyltrimethylammonium bromide (CTAB) and sodium laurate (SL) are used as template agents, and SiO2@Fe3O4 is used as a magnetic particle. After the template agents are added to adjust a pore diameter, the optimal adsorption pore diameter is 6.27 nm. As the influence of adsorption temperature, the initial pH value of a solution, ion strength and a humic acid concentration on the adsorption effect is taken into consideration, adsorption conditions after optimization are that the adsorption temperature is 294.62 K, the initial pH value is 6.27 and the ion strength is 0.37 g.L<-1>; and under the conditions, optimal adsorption effect is obtained, and the adsorption quantity of a ceftazidime solution reaches 96.84 mg.g<-1>. Repeated regeneration experiments also show that the ZIF-8@SiO2@Fe3O4 has good cyclic utilization, and the utilization rate of the ZIF-8@SiO2@Fe3O4 after fivecycles still reaches 90% or above. The adsorbent is prepared through a room-temperature stirring method, and the template agents are removed through calcination, so the method is simple; and the adsorbent is good in cyclic utilization and can serve as an adsorbent with excellent properties.

Description

technical field [0001] The invention relates to the field of antibiotic adsorption, in particular to the pore modification and adsorption application of a magnetic zeolite imidazole framework material. Background technique [0002] In recent years, a large number of frequent use of various drugs, human and animal excretion, unreasonable disposal of waste drugs, and imperfect sewage treatment technology have led to serious drug pollution in the water environment. Residual antibiotics in the environment will lead to drug resistance of animal pathogens, and drug resistance genes will be transmitted through transformation, transduction or food chain, resulting in the transfer of drug resistance genes between ecosystems. At the same time, it will inhibit the immune system of the organism, damage the immune cells of the organism, and lead to a significant reduction in the disease resistance and immunity of the organism. When the self-purification ability of the environment itself...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28C02F101/34C02F101/38
CPCB01J20/06B01J20/103B01J20/226B01J20/28009B01J20/28014B01J20/3057B01J20/3064C02F1/288C02F2101/34C02F2101/38C02F2101/40
Inventor 胡翔段浛笑
Owner BEIJING UNIV OF CHEM TECH
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