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Preparation of a carboxymethylcellulose-chitosan composite xerogel and its application to absorb indigo in water

A technology of carboxymethyl cellulose and sodium carboxymethyl cellulose, which is applied in the field of wastewater treatment and material synthesis, can solve problems such as easy agglomeration and limited application range, and achieve the effect of fast adsorption rate

Active Publication Date: 2018-06-08
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong hydrogen bond in the cellulose and chitosan molecules, it is easy to agglomerate, which limits its application range to a certain extent.

Method used

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  • Preparation of a carboxymethylcellulose-chitosan composite xerogel and its application to absorb indigo in water
  • Preparation of a carboxymethylcellulose-chitosan composite xerogel and its application to absorb indigo in water
  • Preparation of a carboxymethylcellulose-chitosan composite xerogel and its application to absorb indigo in water

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Experimental program
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Effect test

Embodiment 1

[0027] Prepare 2mg / mL sodium carboxymethylcellulose solution (the electrolyte is 0.1M sodium dihydrogen phosphate solution), and then add 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride to the solution Salt and N-hydroxysuccinimide, with constant stirring, activate the carboxyl groups in the sodium carboxymethylcellulose. Prepare 1mg / mL, 2mg / mL and 4mg / mL chitosan solutions. Add the prepared chitosan solution dropwise to the sodium carboxymethyl cellulose solution, stir and keep the reaction for 4h, centrifuge the precipitated white solid and wash it with 0.1M acetic acid and ultrapure water for 3 times, and store it at -45 Freeze-drying at ℃ for 24h, grinding for subsequent use, obtaining chitosan mass percentage content (wt%) is respectively 33%, 50% and 67% carboxymethyl cellulose-chitosan composite xerogel, compared with carboxymethyl Cellulose-chitosan composite xerogel (33wt%) (attached figure 1 ) and carboxymethylcellulose-chitosan composite xerogel (67wt%) ...

Embodiment 2

[0029] The effect of adsorption time on the equilibrium adsorption capacity of indigo was investigated. Weigh 0.1g carboxymethylcellulose-chitosan composite xerogel (50wt%) and add it into 100mL 50mg / L indigo solution, absorb 10, 20, 30, 40, 50, 60, 70, 80, After 90, 120 and 150 minutes, let stand for 2 minutes, take the supernatant, record its UV absorption intensity at 612nm and calculate the adsorption amount of carboxymethylcellulose-chitosan composite xerogel (50wt%) to indigo. as attached Figure 4 As shown, the adsorption of carboxymethylcellulose-chitosan composite xerogel (50wt%) to indigo reaches equilibrium at 60 minutes, and the equilibrium adsorption amount is 27 mg / g.

Embodiment 3

[0031] The effect of the initial concentration of indigo on the equilibrium adsorption capacity of indigo was investigated. Get 0.1g carboxymethylcellulose-chitosan composite xerogel (50wt%) to add 100mL concentration and be respectively the indigo of 10mg / L, 20mg / L, 30mg / L, 50mg / L, 80mg / L and 100mg / L In the solution, after adsorbing for 60min at 100rpm, let it stand for 2min, take the supernatant, record its ultraviolet absorption intensity at 612nm and calculate the equilibrium adsorption of carboxymethylcellulose-chitosan composite xerogel (50wt%) to indigo quantity. as attached Figure 5 As shown, with the increase of indigo concentration, the adsorption amount of carboxymethyl cellulose-chitosan composite xerogel (50wt%) to indigo increases and reaches equilibrium. When the initial concentration rises to 50mg / L, the equilibrium adsorption The amount reached 27mg / g.

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Abstract

The invention relates to preparation of carboxymethyl cellulose-chitosan composite xerogel and application of the carboxymethyl cellulose-chitosan composite xerogel to adsorbing indigo in water.The preparation and the application include preparing the carboxymethyl cellulose-chitosan composite xerogel; adsorbing the indigo in the water.The preparation and the application have the advantages that a method for preparing the carboxymethyl cellulose-chitosan composite xerogel is simple, and the carboxymethyl cellulose-chitosan composite xerogel is excellent in biodegradation and high in indigo molecule absorption rate.

Description

technical field [0001] The invention relates to the preparation of a carboxymethyl cellulose-chitosan composite xerogel and its application to absorb indigo in water, belonging to the fields of waste water treatment and material synthesis. technical background [0002] Indigo is one of the most traditional and stable organic dyes in the textile industry. It is mostly used for dyeing woolen and denim fabrics. Indigo has good water solubility and the solution is dark blue. It is often discharged into rivers along with water. The color of water quality It is the most obvious identification indicator of water pollution. Discharging colored water directly without treatment not only affects the beauty of nature, but also a large number of colored water blocks the absorption and reflection of light in the water. In addition, indigo is easily oxidized to isatin and hydrolyzed to anthranilic acid, which is toxic. [0003] So far, some adsorbents have been applied to dye wastewater t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28
CPCB01J20/24B01J2220/4825C02F1/286C02F2101/308
Inventor 孔泳鲍丽平朱馨怡
Owner CHANGZHOU UNIV