Calcium alginate/5-Cl-PADAB microspheres and preparation method and application thereof

A calcium alginate, 5-cl-padab technology, applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc., can solve problems such as unseen macromolecular organic matter, and achieve environmental friendliness, cheap and easy-to-obtain raw materials , the effect of mild reaction conditions

Active Publication Date: 2016-06-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research focuses on spectrophotometry, some of which involve titration indicators, and there is no research on grafting it into high-molecular organic matter

Method used

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  • Calcium alginate/5-Cl-PADAB microspheres and preparation method and application thereof
  • Calcium alginate/5-Cl-PADAB microspheres and preparation method and application thereof
  • Calcium alginate/5-Cl-PADAB microspheres and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: Preparation of calcium alginate / 5-Cl-PADAB microspheres

[0029] (1) Dissolve 0.2 g of sodium alginate in 20 mL of deionized water, stir to dissolve, and adjust the pH value to 6 with 0.01 mol / L hydrochloric acid solution to form a sodium alginate solution;

[0030] (2) Add 0.175g ethyldimethylaminopropylcarbodiimide (EDC) and 0.099g N-hydroxysulfosuccinimide (sulf-NHS) successively to sodium alginate solution, and stir magnetically for 15min at room temperature , fully mixed to obtain a mixed solution;

[0031] (3) 0.050g5-Cl-PADAB was dissolved in 25mL dimethyl sulfoxide (DMSO) solution to form a mixed solution of dimethyl sulfoxide, which was then added to the mixed solution obtained in step (2), and used Adjust the pH value to 7 with 0.01mol / L hydrochloric acid solution or 0.01mol / L sodium hydroxide solution, stir magnetically at room temperature for 24 hours, and mix thoroughly to obtain a mixed solution;

[0032] (4) After the mixed solution obtain...

Embodiment 2

[0036] Get 1 calcium alginate / 5-Cl-PADAB microsphere that obtains in embodiment 1, join in containing 40mg / LCu 2+ In the solution, the calcium alginate / 5-Cl-PADAB microspheres changed from yellow to obvious red by naked eyes, and the calcium alginate / 5-Cl-PADAB microspheres adsorbed Cu 2+ before and after comparison figure 2 shown.

Embodiment 3

[0038] Take 0.5g calcium alginate / 5-Cl-PADAB microspheres (moisture content is about 85%) and add to 50mL containing Cu 2+ In the solution, after reacting for 1h, the flame atomic absorption method was used to determine Cu 2+ change in concentration. The test results showed that Cu 2+ The initial concentration was 36.87mg / L, and it was 5.51mg / L after 1h of reaction, and the removal rate was about 85%. 2+ The adsorption efficiency is about 20.87 mg / g.

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Abstract

The invention belongs to the field of environment pollution detection and wastewater treatment and discloses calcium alginate/5-Cl-PADAB microspheres and a preparation method and application thereof. The preparation method includes: by EDC/sulfo-NHS, an amino containing indicator 5-Cl-PADAB is grafted to sodium alginate to obtain a 5-Cl-PADAB grafted sodium alginate precipitation product; dissolving the product and sodium alginate into deionized water, and then dripping into a crosslinking agent solution to obtain yellow calcium alginate/5-Cl-PADAB microspheres. The microspheres have the advantage that a metal ion detection performance is improved on the basis that an alginic acid adsorption performance is not reduced obviously. In addition, the preparation method is simple, mild in reaction condition, easy to operate, low cost and easy in acquisition of sodium alginate materials, environment friendly and suitable for industrial application.

Description

technical field [0001] The invention belongs to the field of environmental pollution detection and waste water treatment, and in particular relates to a calcium alginate / 5-Cl-PADAB microsphere and a preparation method and application thereof. Background technique [0002] Alginic acid is a natural polymer polysaccharide, which can be extracted from marine plant macroalgae, kelp, sargassum, etc., and is a natural polymer adsorbent. The molecular formula of sodium alginate is (C 6 h 7 o 6 Na)n is a linear polymer connected by (1-4)--L-guluronic acid (Guluronate, G) and (1-4)--D-mannuronic acid (Mannuronate, M). Sodium alginate can interact with various metal ions to form a gel. The common calcium alginate gel adsorbs Cu through various forms such as ion exchange, chelation, and physical adsorption. 2+ 、Co 2+ 、Ni 2+ 、Cd 2+ , Zn 2+ , these metal ions replace Ca in the gel 2+ Form a new ion cross-linked structure, thereby reducing the content of metal ions in water. Ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/62
CPCB01J20/22B01J20/24B01J20/28011B01J2220/4825C02F1/286C02F2101/20
Inventor 王建龙庄淑婷
Owner TSINGHUA UNIV
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