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Preparation method of polylactic acid porous film for anionic dye wastewater treatment

An anionic dye and porous film technology, applied in the field of polylactic acid porous film preparation, can solve the problems of small adsorption effect and poor purification treatment effect, and achieve the effects of low preparation cost, promotion of contact and adsorption, and mild reaction conditions

Active Publication Date: 2017-11-03
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, electrospun membranes are used to treat anionic dye wastewater. Due to the small adsorption of electrospun membranes and anionic dyes, the purification treatment effect is poor.

Method used

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  • Preparation method of polylactic acid porous film for anionic dye wastewater treatment
  • Preparation method of polylactic acid porous film for anionic dye wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of preparation method of the polylactic acid porous membrane that is used for anionic dye wastewater treatment, its steps are as follows:

[0027] A. Dichloromethane and N,N-dimethylformamide are formulated into a mixed solvent at a volume ratio of 5.67:1, and 20 parts by weight of polylactic acid and 0.2 parts by weight of a strong basic small molecule compound containing polyamino groups - Diethylenetriamine was added to 100 parts by weight of the mixed solvent, stirred in a water bath at 36°C, and stirred until the polylactic acid was completely dissolved to obtain a mixed solution;

[0028] B. Add 0.9 parts by weight of an amino group-containing silane coupling agent—γ-aminopropyltriethoxysilane to the mixed solution and stir in a water bath at 36°C for 1.2 hours to obtain a polylactic acid electrospinning solution;

[0029] C. The polylactic acid electrospinning solution is used as the raw material solution for electrospinning, and electrospinning is perform...

Embodiment 2

[0037] A kind of preparation method of the polylactic acid porous membrane that is used for anionic dye wastewater treatment, its steps are as follows:

[0038] A. Dichloromethane and N,N-dimethylformamide are formulated into a mixed solvent at a volume ratio of 9:1, and 25 parts by weight of polylactic acid and 0.3 parts by weight of a strong basic small molecule compound containing polyamino groups - Diethylenetriamine was added to 100 parts by weight of the mixed solvent, stirred in a water bath at 38°C, and stirred until the polylactic acid was completely dissolved to obtain a mixed solution;

[0039] B. Add 1.2 parts by weight of an amino group-containing silane coupling agent—γ-aminopropyltriethoxysilane to the mixed solution and stir in a water bath at 38°C for 1.3 hours to obtain a polylactic acid electrospinning solution;

[0040] C. The polylactic acid electrospinning solution is used as the raw material solution for electrospinning, and electrospinning is performed ...

Embodiment 3

[0042] A kind of preparation method of the polylactic acid porous membrane that is used for anionic dye wastewater treatment, its steps are as follows:

[0043] A. Dichloromethane and N,N-dimethylformamide are formulated into a mixed solvent at a volume ratio of 5.67:1, and 15 parts by weight of polylactic acid and 0.4 parts by weight of a strong basic small molecule compound containing polyamino groups - Diethylenetriamine was added to 100 parts by weight of the mixed solvent, stirred in a water bath at 30°C, and stirred until the polylactic acid was completely dissolved to obtain a mixed solution;

[0044] B. Add 0.6 parts by weight of an amino group-containing silane coupling agent—γ-aminopropyltrimethoxysilane to the mixed solution and stir in a water bath at 35°C for 0.8 hours to obtain a polylactic acid electrospinning solution;

[0045] C. The polylactic acid electrospinning solution is used as the raw material solution for electrospinning, and electrospinning is perfor...

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Abstract

The invention discloses a preparation method of a polylactic acid porous film for anionic dye wastewater treatment, which comprises the main steps of A, preparing dichloromethane and N,N-dimethylformamide into a mixed solvent according to the volume ratio of (4 to 9) to 1, adding 15 to 25 parts by weight of polylactic acid and 0.1 to 0.4 part by weight of poly-amino-containing strong basicity small molecule compound into 100 parts by weight of the mixed solvent, stirring at a water bath of 30 to 38 DEG C until the polylactic acid is dissolved, thus obtaining a mixed solution; B, adding 0.6 to 1.2 parts by weight of amino-containing silane coupling agent, stirring at the water bath of 30 to 38 DEG C for 0.8 to 1.3h, thus obtaining a polylactic acid electrostatic spinning solution; C, taking the polylactic acid electrostatic spinning solution as a raw material solution for electrostatic spinning, and performing electrostatic spinning to obtain the polylactic acid porous film. The porous film prepared by the method provided by the invention has good adsorptive property to anions in the anionic dye wastewater; the purification treatment effect on the wastewater is good, and the preparation technology is simple.

Description

technical field [0001] The invention relates to a preparation method of a polylactic acid porous film used for anionic dye wastewater treatment. technical background [0002] Dye wastewater is one of the main harmful industrial wastewater, which mainly comes from the production industry of dyes and dye intermediates. It is composed of the mother liquor of crystallization of various products and intermediates, materials lost during the production process, and sewage from washing the ground. With the continuous growth of the dye industry, its production wastewater has become a major source of water pollution. According to the ionic state of dye molecules dissociated in aqueous solution, the field of environmental engineering is divided into: anionic dyes (such as direct dyes, acid dyes); cationic dyes (such as basic dyes); non-ionic dyes (such as disperse dyes). Among them, the production scale of anionic dyes is large, the discharge of wastewater is large, and the pollution ...

Claims

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Application Information

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IPC IPC(8): B01D71/48B01D69/02B01D67/00B01J20/26B01J20/28B01J20/30B01J39/19C02F1/42C02F1/44C02F101/30
CPCB01D67/0002B01D69/02B01D71/48B01D2323/39B01D2325/16B01J20/265B01J20/28033B01J39/19C02F1/42C02F1/44C02F2001/422C02F2101/308
Inventor 王勇张迪杨静晖张楠黄婷
Owner SOUTHWEST JIAOTONG UNIV
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