Preparation method of chitosan-hydrotalcite nanocomposite material

A nanocomposite material, chitosan technology, applied in chemical instruments and methods, water pollutants, adsorbed water/sewage treatment, etc., can solve problems such as separation difficulties, influence of adsorption capacity, unfavorable chitosan applications, etc.

Active Publication Date: 2018-12-14
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although chitosan has a good adsorption effect on heavy metals, chitosan is easily soluble in an acidic environment, and the pH of the solution has a grea

Method used

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  • Preparation method of chitosan-hydrotalcite nanocomposite material
  • Preparation method of chitosan-hydrotalcite nanocomposite material
  • Preparation method of chitosan-hydrotalcite nanocomposite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Add 0.5 g of chitosan into 70 ml of 2% acetic acid solution, and dissolve it by ultrasonic to obtain a slightly yellowish transparent solution. Add 0.5-2g magnesium aluminum hydrotalcite into 50ml 2% acetic acid solution to dissolve.

[0041] (2) Put two parts of the solution into a three-hole flask at the same time, stir and react for 1 h. Add 5ml of formaldehyde, raise the temperature to 60°C, and react for 1h. Use 1mol / L NaOH solution to adjust the pH to about 9.0, add 10ml of epichlorohydrin, adjust the pH at any time to keep it at about 9.0, and react for 2.5 hours.

[0042] (3) Wash with absolute ethanol until neutral, and finally dry at 60° C., grind and sieve to obtain white solid chitosan / magnesium aluminum hydrotalcite (CS-LDH).

[0043] At room temperature, add 0.05g CS-LDH to 20ml 100mg / L cadmium nitrate solution, shake for 240min, and measure the adsorption rate. 2+ The removal rate of chitosan to Cd was 72.99%. 2+ The removal rate is 61.01%.

[00...

Embodiment 2

[0054] At room temperature, add a certain mass of CS-LDH to 20ml of 300mg / L Pb 2+ solution, shake at room temperature for 240min, then centrifuge, take the supernatant to detect Pb 2+ Concentration, according to the added Pb 2+ The initial concentration and Pb in the solution after adsorption 2+ The remaining concentration of Pb is calculated 2+ removal rate. Under the same conditions, using chitosan and magnesium aluminum hydrotalcite to adsorb Pb 2+ Conduct a comparative test.

[0055] At room temperature, add a certain mass of CS-LDH to 20ml of 100mg / L Cd 2+ solution, shake at room temperature for 240min, then centrifuge, take the supernatant to detect Cd 2+ Concentration, depending on the added Cd 2+ The initial concentration of and the Cd of the solution after adsorption 2+ The remaining concentration of the calculated Cd 2+ removal rate. Under the same conditions, chitosan and magnesium aluminum hydrotalcite were used to adsorb Cd 2+ Conduct a comparative test...

Embodiment 3

[0065] Add 0.05g CS-LDH to 20ml 300mg / L Pb at room temperature 2+ In the solution, adjust different pHs, shake for 240 minutes, and calculate the removal rate and adsorption capacity (see Table 4 for details).

[0066] Add 0.05g CS-LDH to 20ml 100mg / L Cd at room temperature 2+ In the solution, adjust different pHs, shake for 240 minutes, and calculate the removal rate and adsorption capacity (see Table 5 for details).

[0067] Table 4 pH on CS-LDH adsorption of Pb 2+ Impact

[0068]

[0069]

[0070] Table 5 pH on CS-LDH adsorption of Cd 2+ Impact

[0071]

[0072] From Table 4, 5 and Figure 9 It can be seen that the adsorption of heavy metal ions by CS-LDH is less affected by pH.

[0073] 4. Adsorption of heavy metal ions of different concentrations by CS-LDH

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Abstract

The invention relates to a preparation method of a chitosan-hydrotalcite nanocomposite material. The preparation method comprises the following steps: step one, adding 0.5g of chitosan into 70 mL of a2% acetic acid solution, carrying out ultrasonic dissolution to obtain a yellowish transparent solution, and adding 0.5-2.5 g of magnesium aluminum hydrotalcite into 50 mL of a 2% acetic acid solution for dissolution; step two, putting the two dissolving solutions into a three-necked flask at a same time, carrying out a reaction by stirring for 1 hour, adding 5 mL of formaldehyde, carrying out heating to 60 DEG C, carrying out a reaction for 1 hour, adjusting the pH value to be about 9.0 by using a NaOH solution with a concentration of 1 mol/L, adding 10 mL of epichlorohydrin, keeping the pHvalue to be about 9.0 at any time by adjusting, and carrying out a reaction for 2.5 hours; and step three, carrying out washing with absolute ethyl alcohol to neutrality, finally carrying out drying at a temperature of 60 DEG C, and carrying out grinding and sieving to obtain the white solid chitosan/magnesium aluminum hydrotalcite.

Description

technical field [0001] The invention relates to the field of heavy metal sewage treatment, in particular to a preparation method of a chitosan-hydrotalcite nanocomposite material. Background technique [0002] Heavy metals are widely distributed and non-biodegradable, and accumulate in the human body through the food chain, posing a serious threat to human health and life. Therefore, finding an effective method to remove heavy metals is an urgent problem in water treatment. The treatment methods of heavy metal polluted wastewater include chemical precipitation, ion exchange, membrane filtration, adsorption, electrolysis and photocatalysis. Among them, the adsorption method has become the preferred choice for the removal of heavy metals from water due to its flexible design, simple operation, high-quality effluent, and regenerable adsorbent. It is necessary to find an environmentally friendly, readily available, efficient and cheap adsorbent. [0003] Hydrotalcite compound...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/10B01J20/24C02F1/28C02F2101/20
Inventor 吕飞燕闫良国张晓慧杨松岳于海琴杜斌
Owner UNIV OF JINAN
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