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Preparation method of alginate metal cross-linked chitosan adsorption material and application thereof

A technology of metal crosslinking and composite adsorption materials, which is applied in the field of preparation of alginate metal crosslinking chitosan composite adsorption materials. Utilization, easy separation, and high adsorption capacity

Inactive Publication Date: 2019-07-30
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, more research on adsorbents has focused on micron and nanometer materials. Although these adsorbents have the advantages of large specific surface area and high adsorption capacity, they also have disadvantages such as small particles, difficult separation and post-processing, and inability to be reused. Therefore, it is limited in practical application

Method used

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  • Preparation method of alginate metal cross-linked chitosan adsorption material and application thereof
  • Preparation method of alginate metal cross-linked chitosan adsorption material and application thereof
  • Preparation method of alginate metal cross-linked chitosan adsorption material and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Weigh 2 g of chitosan powder, dissolve it in 100 mL of 1% dilute acetic acid solution under stirring with a magnetic stirrer, add 3.22 g of ZrOCl 2 ·8H 2 O, stirred at room temperature for 2-3 h to form a homogeneous mixed solution; added NaOH solution to adjust the pH>6; Add NaOH solution to adjust the pH>11; after sealing, cross-link in a refrigerator at 4°C for 12 h at low temperature; remove the supernatant of the suspension and take out the precipitate, dry it with an infrared dryer and wash it to neutral; dry and grind to obtain Zirconium-chitosan powder; weigh 6 g of the above powder and add it to 100 mL of 20 g / L sodium alginate solution, stir for 1 h to disperse it evenly; drop the above solution into 2% CaCl by constant flow pump 2 After solidification in the solution, the alginate metal cross-linked chitosan composite material can be obtained by freeze-drying. The appearance is brownish-yellow spherical particles, and the mass is about 3 mg / granule.

Embodiment 2

[0021] Weigh 100 mg of adsorption material and add it to sodium arsenate and sodium arsenite solutions with initial concentrations of 1, 5, 10, 15, 20, 30, 40, and 50 mg / L respectively, and adjust the pH value to about 2 at room temperature. Shake or stir for 48 hours. After the adsorption is completed, the solution and the adsorbent are separated, and the change of the concentration of arsenic in the solution before and after adsorption is measured by plasma emission spectroscopy, and the adsorption capacity of the adsorbent for arsenic is calculated.

[0022] Depend on image 3 It can be seen that the prepared alginate metal cross-linked chitosan composite adsorption material is spherical or ellipsoidal, and its particle size is about 2.0-2.8 mm.

[0023] Depend on Figure 4 It can be seen that the prepared alginate metal cross-linked chitosan composite adsorption material has a good adsorption effect on inorganic arsenic, and its maximum adsorption capacity for arsenic (Ⅲ)...

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Abstract

The invention belongs to the field of environmental functional materials, and relates to a preparation method of an alginate metal cross-linked chitosan composite adsorption material and application thereof. The adsorption material is a composite material obtained by crosslinking of a transition metal ion with chitosan and compounding with the alginate. An adsorbent has a porous small spherical shape and is applied to the adsorption of inorganic arsenic in waste water. The adsorbent has a small input amount and a high adsorption capacity, is easily separated from an aqueous solution system, and can be regenerated and reused after being desorbed. The alginate metal cross-linked chitosan composite adsorption material prepared has good acid resistance and large adsorption capacity and can bedirectly separated; the process for treating arsenic-containing wastewater is simple, environmentally friendly and low in cost, and has excellent application prospects in the water treatment field.

Description

technical field [0001] The invention belongs to the technical field of environmental functional materials, and in particular relates to a preparation method and application of an alginate metal cross-linked chitosan composite adsorption material. Background technique [0002] Arsenic is a naturally occurring metalloid that is widely used in various fields such as electronics, agriculture, wood protection, metallurgy and medicine. Due to its high toxicity, the arsenic discharged into the environment by human production activities not only seriously endangers the safety of drinking water for human beings, but also destroys the living environment of other organisms. Therefore, the treatment of arsenic-containing wastewater is of great significance to reduce the threat to human health and protect the environment. [0003] At present, the methods for removing arsenic in water mainly include oxidation method, coagulation-flocculation method, adsorption method, membrane separation...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30B01J20/34C02F1/28C02F101/10
CPCB01J20/0207B01J20/0211B01J20/0274B01J20/24B01J20/3425B01J20/3475C02F1/286C02F2101/103
Inventor 娄思超张玲帆刘鑫刘宝贺常全张文清夏玮徐志珍
Owner EAST CHINA UNIV OF SCI & TECH
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