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Sodium alginate/carboxylated cellulose nanocrystal hydrogel microsphere for adsorbing lead ions

A technology of nanocrystalline cellulose and hydrogel microspheres, which is applied in the fields of adsorption water/sewage treatment, water/sewage treatment, water/sludge/sewage treatment, etc. , water toxic residues and other problems, to achieve the effect of no toxic side effects, good uniformity, high adsorption capacity

Active Publication Date: 2018-05-11
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are many methods for the technology of adsorbing lead ions. The prior art, such as the Chinese invention patent with authorized public number CN 104437389 B, discloses a preparation method and application of an adsorbent for treating lead-containing wastewater. The inventive method pre-processes phosphogypsum. treatment, and then use sodium dodecylbenzenesulfonate to modify the pretreated phosphogypsum, and then perform ultrasonic treatment to prepare lead ion adsorbent. This adsorbent has the advantages of simple preparation and good stability, but its modification The agent sodium dodecylbenzene sulfonate has weak toxicity, and it is easy to cause toxic and side effects residues on the water body. The raw material phosphogypsum itself also has heavy metal ions and radioactive substances, which are harmful to the human body and the environment. The adsorbent in the inventive method is powder , the adsorbent cannot be reused after elution, so its utilization rate is low

Method used

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  • Sodium alginate/carboxylated cellulose nanocrystal hydrogel microsphere for adsorbing lead ions

Examples

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Effect test

Embodiment 1

[0018] A sodium alginate / carboxylated nanocrystalline cellulose hydrogel microsphere adsorbing lead ions, the preparation method of which comprises the following steps:

[0019] 1) Accurately weigh 15 parts of microcrystalline cellulose in a container, use a measuring cylinder to measure 150 parts of sulfuric acid solution with a concentration of 60%, add it to the container, stir and react at 45°C and 280r / min for 60 minutes, and then add An equal volume of distilled water was used to terminate the reaction; after standing for 8 hours, the suspension was centrifuged at a high speed of 20,000r / min for 10 minutes, and the centrifugation was repeated 5 times. The liquid becomes neutral and dried at low temperature to obtain nanocellulose; the nanocellulose prepared by sulfuric acid hydrolysis has a large specific surface area and strong hydrophilicity, and more hydroxyl groups are exposed to form hydrogen bonds, which makes the nanocellulose agglomerate and form a coagulate. 2) ...

Embodiment 2

[0021]A sodium alginate / carboxylated nanocrystalline cellulose hydrogel microsphere that adsorbs lead ions, its composition and parts by weight are: 6 parts of sodium alginate, 8 parts of carboxylated nanocrystalline cellulose, and 0.52 parts of divinyl sulfone 40 parts of calcium chloride solution of 180 parts, distilled water, 0.2mol / L; Its preparation method specifically comprises the following steps:

[0022] 1) Preparation of nanocrystalline cellulose: Accurately weigh 16 parts of microcrystalline cellulose in a container, measure 180 parts of sulfuric acid solution with a concentration of 63% into the container with a graduated cylinder, and stir at 46°C and 300r / min React for 80 minutes, add an equal volume of distilled water after the reaction to terminate the reaction; after standing for 12 hours, take the suspension and centrifuge at a high speed of 21000r / min for 15 minutes, repeat the centrifugation 6 times, transfer the turbid solution into a dialysis bag of 8000-1...

Embodiment 3

[0026] A sodium alginate / carboxylated nanocrystalline cellulose hydrogel microsphere that adsorbs lead ions, its composition and parts by weight are: 6 parts of sodium alginate, 8 parts of carboxylated nanocrystalline cellulose, and 0.50 parts of divinyl sulfone 0.050 part of D-(+)-di-p-toluyl tartaric acid, 40 parts of calcium chloride solution of 160 parts of distilled water, 0.1mol / L, and its preparation method specifically comprises the following steps:

[0027] Preparation of nanocrystalline cellulose: Accurately weigh 15 parts of microcrystalline cellulose in a container, measure 150 parts of sulfuric acid solution with a concentration of 63% in a graduated cylinder, add it to the container, and stir and react at 46°C and 300r / min for 60 After the reaction, an equal volume of distilled water was added to terminate the reaction; after standing for 10 hours, the suspension was centrifuged at a high speed of 20000r / min for 10 minutes, and the centrifugation was repeated 5 ti...

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Abstract

The invention discloses a sodium alginate / carboxylated cellulose nanocrystal hydrogel microsphere for adsorbing lead ions. The sodium alginate / carboxylated cellulose nanocrystal hydrogel microsphere comprises, by weight, 5-8 parts of sodium alginate, 6-8 parts of carboxylated cellulose nanocrystals, 0.5-0.52 parts of divinyl sulfone, 150-180 parts of distilled water and 30-40 parts of a 0.1-0.2 mol / L calcium chloride solution. The sodium alginate / carboxylated cellulose nanocrystal hydrogel microsphere has the following advantages: the sodium alginate and microcrystalline cellulose which are used as raw materials in the method are natural materials, so the microsphere is nontoxic and harmless, is friendly to the environment, and realizes appreciation and full utilization of materials as a water purifier; and the prepared hydrogel microsphere has a good homogeneity, a uniform particle size, no toxic or side effects, a large specific surface area and a large porosity, has high adsorptioncapability to lead ions and other heavy metal ions, can be used as a safe and efficient lead ion adsorbent, and has a broad industrial application prospect.

Description

technical field [0001] The invention relates to the field of preparation of heavy metal ion adsorbents, in particular to sodium alginate / carboxylated nanocrystalline cellulose hydrogel microspheres for adsorbing lead ions. technical background [0002] Sodium alginate is a by-product of extracting iodine and mannitol from brown algae kelp or sargassum, and its molecules are composed of β-D-mannuronic acid (M) and α-L-guluronic acid (G) Press (1→4) to connect. Sodium alginate contains a large amount of -COO-, which can exhibit polyanionic behavior in aqueous solution and has certain adhesion, and can be used as a drug carrier for treating mucosal tissues. Under acidic conditions, -COO- transforms into -COOH, the degree of ionization decreases, the hydrophilicity of sodium alginate decreases, the molecular chain shrinks, and when the pH value increases, the -COOH group dissociates continuously, and the hydrophilicity of sodium alginate Sodium alginate has obvious pH sensitiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/28B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28021B01J20/28047C02F1/286C02F2101/20
Inventor 马剑茵
Owner ZHEJIANG OCEAN UNIV
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