Preparation method of sea squirt nanocellulose-based heavy metal adsorbent

A technology of nanocellulose and true ascidian, which is applied in the directions of alkali metal compounds, chemical instruments and methods, adsorbed water/sewage treatment, etc., to achieve the effects of good degradability, strong physical cross-linking, and wide application prospects

Active Publication Date: 2021-11-30
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Preparation method of sea squirt nanocellulose-based heavy metal adsorbent
  • Preparation method of sea squirt nanocellulose-based heavy metal adsorbent
  • Preparation method of sea squirt nanocellulose-based heavy metal adsorbent

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preparation example Construction

[0073] The embodiment of the present invention discloses a method for preparing an ascidian nanocellulose-based heavy metal adsorbent, which specifically includes the following steps:

[0074] (1) Isolate tunicin from true sea squirt, then add sulfuric acid to hydrolyze it, let it stand still, then centrifuge to obtain the centrifugate, then dialyze it with deionized water to neutrality, and then freeze-dry to obtain white flocculent tunicin nano Whiskers;

[0075] Wherein, the mass concentration of sulfuric acid solution is 60wt%, and the mass volume ratio of tunicin and sulfuric acid solution is 400g / 400mL;

[0076] The temperature of hydrolysis is 60°C, the time is 3 hours, and the number of times is 3 times;

[0077] The standing time is 8 hours, and the temperature is 25°C;

[0078] Centrifugal speed 2000r / min, time 5min;

[0079] For dialysis, add it to a dialysis bag with a specification of MD44 (1000), then soak it in deionized water for dialysis, and change the dei...

Embodiment 1

[0097] Embodiment 1 of the present invention discloses a preparation method of a high-strength and high-efficiency E. ascidian nanocellulose-based heavy metal adsorbent, which specifically includes the following steps:

[0098] (1) Preparation of tunicin nanowhiskers

[0099] (a) Wash and dissect the fresh ascidian, cut off the root of the true ascidian, and remove the viscera; then place it in a beaker, add 5wt% NaOH solution, soak for 8 hours at room temperature, then pour off the NaOH solution, and repeat with deionized water Wash until neutral; then remove the inner membrane to separate the outer capsule from the inner membrane, so as to facilitate the subsequent alkali washing to remove lipids, and the outer capsule of the true ascidian can be obtained;

[0100] (b) Cut the outer coat of Ascidian ascidian into small pieces, add 5wt% NaOH solution and place it in a beaker, put the beaker in a water bath, stir with a stirring bar at 45°C for 8 hours; then repeat the above o...

Embodiment 2

[0111] Embodiment 2 of the present invention discloses a preparation method of a high-strength and high-efficiency E. ascidian nanocellulose-based heavy metal adsorbent. The steps and specific technical parameters are the same as in Embodiment 1. Only the methacrylic acid N, N -Dimethylaminoethyl ester and acrylic acid are replaced by 0:100 according to the mass ratio.

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Abstract

The invention discloses a sea squirt nanocellulose-based heavy metal adsorbent and a preparation method thereof. The preparation process comprises the following steps of: separating tunicin from sea squirt, and carrying out acidolysis and other operations on the tunicin to obtain a tunicin nanowhisker suspension; and adding a chitosan solution, a mixture of methacrylic acid N, N-dimethylaminoethyl ester and acrylic acid as well as an initiator solution into the tunicin nanowhisker suspension, reacting in a constant-temperature water bath to obtain a nano-composite hydrogel product, and freeze-drying to obtain a solid product. The preparation method disclosed by the invention is easy to operate, mild in condition, simple in reaction and low in preparation cost. The obtained sea squirt nanocellulose-based heavy metal adsorbent is large in adsorption capacity and good in regeneration performance, and has wide application prospects in the water treatment fields such as treatment of heavy metal industrial pollutants.

Description

technical field [0001] The invention relates to the technical field of heavy metal wastewater treatment, and more specifically relates to an ascidian nanocellulose-based heavy metal adsorbent and a preparation method thereof. Background technique [0002] With the development of modern industry, the problem of heavy metal pollution in water is becoming more and more serious. Heavy metals are not biodegradable and can enter the human body along with the biological chain, causing various diseases. Therefore, effective treatment of excessive heavy metal ions in wastewater, reducing their concentration to dischargeable standards, and avoiding harm to human body and organisms are very important for sustainable development. [0003] At present, the treatment methods for heavy metal pollution in water mainly include chemical precipitation, ion exchange, electrochemical treatment, flotation, membrane separation technology, adsorption, etc., among which chemical precipitation, ion ex...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J20/28011C02F1/286C02F2101/20B01J2220/4812
Inventor 车玉菊刘峰孟凡君刘晓楠熊攀马庆林
Owner SHANDONG UNIV
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