Method for preparing crosslinked-chitosan-system azo dye wastewater adsorbent

A technology for cross-linking chitosan and azo dyes, which is applied in the preparation of microspheres, microcapsule preparations, chemical instruments and methods, etc., can solve the problems of limited application, and achieve good adsorption effect, convenient processing and preparation, and simple structure. Effect

Inactive Publication Date: 2015-07-01
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

However, chitosan is easy to dissolve in acid solution, which limits its application in acidic wastewater treatment system

Method used

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  • Method for preparing crosslinked-chitosan-system azo dye wastewater adsorbent
  • Method for preparing crosslinked-chitosan-system azo dye wastewater adsorbent
  • Method for preparing crosslinked-chitosan-system azo dye wastewater adsorbent

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Embodiment 1

[0027] 1. Use polymethyl methacrylate (PMMA) with a thickness of 1mm to laser engrave microchannels, the width of the main channel of the substrate is 3mm, and the width of the focusing channel is 500μm. The fluid inlet and outlet holes are engraved on the cover plate and the bottom plate, and the hole diameter is 3mm. The base plate 2, the cover plate 1, and the bottom plate 3 are sealed by heat and pressure, and thus the preparation of the microfluidic chip is completed.

[0028] 2. Prepare a 2% acetic acid solution by mass fraction, gradually add chitosan powder therein, and fully dissolve it on a magnetic stirrer, and finally obtain a 2% chitosan acetic acid solution by mass fraction as the water phase. The aqueous phase was filtered three times to remove insoluble impurities. Dissolve Span80 with a mass fraction of 5% in liquid paraffin solution as the oil phase.

[0029] 3. Pass the prepared solution into the external phase and internal phase channels with a syringe pu...

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Abstract

The invention relates to a method for preparing a crosslinked-chitosan-system azo dye wastewater adsorbent. According to the method, the chitosan microsphere adsorbent aiming at azo dye wastewater treatment is prepared by carrying out reversed phase emulsification process and a cross-linking reaction on a microfluidic focusing type chip made from a laboratory-made polymethyl methacrylate (PMMA) material; the chitosan adsorbent prepared by virtue of the method belongs to a micron scale; compared with adsorbents at present, the chitosan adsorbent has the advantages that the specific surface area is larger, the degree of sphericity and the monodispersity are higher, the biocompatibility and the reproducibility of the chitosan adsorbent are guaranteed by virtue of a chitosan matrix, and the dissolving resistance and the swelling resistance of the chitosan adsorbent are improved under acid conditions when relatively high template dye adsorption capacity is guaranteed in a crosslinking process; by testing template dye wastewater methyl orange, the maximal adsorption capacity can reach 65.83mg / g.

Description

【Technical field】 [0001] The invention relates to the field of microfluidic preparation of novel adsorbent materials and dye wastewater treatment, in particular to a method for preparing a cross-linked chitosan system azo dye wastewater adsorbent based on microfluidic technology. 【Background technique】 [0002] Azo dye wastewater has complex components, high chroma, and poor biodegradability, so azo dye wastewater is also recognized as difficult-to-treat organic wastewater (Wang Shaowen, Luo Zhiteng, Qian Lei. High-concentration organic wastewater treatment technology and engineering application [M]. Beijing: Metallurgical Industry Press, 2003, 7(3): 89~92). Combined with cyclone separation technology and adsorption method, large amounts of wastewater can be treated continuously and efficiently. However, due to the uneven particle size and low target adsorption rate of adsorbents at present, the improvement of the separation efficiency of the cyclone separator is affected. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30B01J13/02C02F1/28
Inventor 宣晋董政徐宏白志山张莉赵双良
Owner EAST CHINA UNIV OF SCI & TECH
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