Preparation method of carboxymethyl chitosan modified montrillonite

A technology of carboxymethyl chitosan and sodium-based montmorillonite, which is applied in the field of preparation of antibiotic adsorption materials, can solve problems such as the decrease of adsorption removal rate and limit the application of modified montmorillonite, and achieve rapid adsorption and good application prospects , good water solubility effect

Inactive Publication Date: 2018-11-02
NANJING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

However, the above-mentioned modified montmorillonites are all affected by the pH value in the process of tetracycline wastewater treatment. As the pH value increases, the adsorption and removal rate decreases, which limits the use of modified montmorillonites in tetracycline wastewater treatment to a certain extent. application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 2g of Na-montmorillonite and dissolve it in water to form a suspension with a mass concentration of 1%, and add HNO with a concentration of 0.1mol / L 3 The solution was acidified, the pH was adjusted to 4-6, and after stirring for 10 min, 0.02 g of N,O-carboxymethyl chitosan was added. Stir in a constant temperature water bath at 70°C for 2 hours, then filter with suction, wash with distilled water until the pH is neutral, dry the resulting filter cake at 60°C for 24 hours, grind, and pass through a 200-mesh sieve (≤75μm) to obtain a carboxymethyl shell Polysaccharide-modified montmorillonite adsorbent.

[0017] Weigh the above-mentioned adsorbents 0.01g, 0.02g, 0.04g, 0.06g, 0.08g respectively (that is, the amount of soil input is 0.5g / L, 1g / L, 2g / L, 3g / L, 4g / L), and add In 20mL of tetracycline solution with a concentration of 100mg / L, under constant temperature water bath stirring at 25°C, react for 3h to adsorption equilibrium, take the supernatant and pass thr...

Embodiment 2

[0019] Take by weighing the carboxymethyl chitosan modified montmorillonite adsorbent 0.04g that the embodiment 1 makes, add 20mL concentration and be in the tetracycline solution of 100mg / L, under 25 ℃ of constant temperature water baths stirring, respectively in 20min, 40min, At 60 min, 90 min, 120 min, 150 min, and 180 min, the supernatant was passed through a 0.45 μm microporous membrane, and the concentration of residual tetracycline was measured with a UV-visible spectrophotometer. Each experiment was repeated three times, and the results were expressed as arithmetic mean. After calculation, the removal rates of tetracycline adsorption were 90.0%, 93.7%, 94.3%, 95.7%, 96.0%, 96.2%, 96.2%. It shows that the adsorption time of the above-mentioned adsorbent to tetracycline in wastewater is fast, and the removal rate of tetracycline has reached 90% in 20 minutes. With the increase of time, the removal rate increases gradually, and the removal rate reaches more than 96% after...

Embodiment 3

[0021] Take by weighing the carboxymethyl chitosan modified montmorillonite adsorbent 0.04g that embodiment 1 makes, add 20mL concentration and be in the tetracycline solution of 100mg / L, respectively at 5 ℃, 15 ℃, 25 ℃, 35 ℃, Under stirring in a constant temperature water bath at 45°C, react for 3 hours until adsorption equilibrium, take the supernatant and pass through a 0.45 μm microporous membrane, and measure the concentration of residual tetracycline with a UV-visible spectrophotometer. Each experiment was repeated three times, and the results were expressed as arithmetic mean. After calculation, the adsorption and removal rates of tetracycline were 94.1%, 94.7%, 95.7%, 95.5%, 95.5%, respectively. It shows that temperature has little influence on the adsorption process, and the present invention is applicable to the removal of tetracycline in waste water under the temperature condition of 5°C-45°C, that is, the adsorption process can be carried out at room temperature. ...

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Abstract

The invention discloses a preparation method of carboxymethyl chitosan modified montrillonite. According to the method, firstly, sodium-based montrillonite is subjected to acidification treatment; then, a modifying agent of carboxymethyl chitosan is added; after the constant temperature water bath reaction, the carboxymethyl chitosan modified montrillonite is obtained. The carboxymethyl chitosan modified montrillonite prepared by the method can be used as an adsorbing agent to adsorb tetracycline; the adsorption on tetracycline is fast; the removal rate is high; the removal rate reaches 90 percent in 20min; the adsorption balance is reached in 3h; the influence by the temperature and pH value in the adsorption process is small; the application range is wide; good application prospects arerealized in the tetracycline waste water treatment.

Description

technical field [0001] The invention belongs to the technical field of preparation of antibiotic adsorption materials, and relates to a preparation method of carboxymethyl chitosan modified montmorillonite, in particular to a carboxymethyl chitosan modified montmorillonite for treating tetracycline wastewater method of preparation. Background technique [0002] In recent years, antibiotics have provided many benefits to human life as clinical drugs, agricultural veterinary drugs, and animal growth promoters. As a kind of antibiotic, tetracycline compound (Tetracycline, TC) has the advantages of low price, good antibacterial effect and high feed remuneration, and is widely used in aquaculture and animal husbandry. Because most people have misunderstandings about the use of antibiotics, the abuse of antibiotics often occurs. Studies have shown that after tetracycline compounds enter the organism, they are not fully absorbed, and will diffuse into the water body through human...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/34C02F101/38
CPCB01J20/12B01J20/24B01J2220/46B01J2220/4806B01J2220/4825C02F1/281C02F1/286C02F2101/34C02F2101/38
Inventor 王风云杨蕾褚玉婷王阿龙徐莹夏明珠雷武
Owner NANJING UNIV OF SCI & TECH
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