PH-sensitive type cation regenerated cellulose composite film as well as preparation method and application thereof

A technology of regenerated cellulose and cation, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the complex process of cellulose/chitosan composite membrane, limit the application of membrane separation technology, and unstable product quality. and other problems, to achieve the effects of good biodegradability, overcoming whether the bond is firm, and the preparation process is simple and feasible

Inactive Publication Date: 2012-10-10
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in general, the preparation of cellulose / chitosan composite membrane by these methods is complicated, the product quality is unstable or the cost is high, which limits its application in membrane separation technology.

Method used

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  • PH-sensitive type cation regenerated cellulose composite film as well as preparation method and application thereof
  • PH-sensitive type cation regenerated cellulose composite film as well as preparation method and application thereof
  • PH-sensitive type cation regenerated cellulose composite film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve cotton linter cellulose in 6% NaOH / 5% thiourea aqueous solution to prepare a 4% cellulose solution. After defoaming, cast it on a glass plate to form a 0.5mm solution layer, and then pre-solidify in air for 10 minutes. And then stably immersed in 0.5% chitosan solution dissolved in 2% acetic acid aqueous solution for 3 hours, take it out after removing the film, wash it with water and dry it in the air, and use an electronic universal testing machine to test its mechanical properties.

[0024] The stress-strain curves of the prepared composite membrane and pure regenerated cellulose membrane (the cellulose solution is directly immersed in 2% acetic acid aqueous solution for 3h after pre-coagulation) are shown in Fig. figure 1 . Figure 4 The scanning electron micrographs of the composite membrane (A) prepared for Example 1 and the pure regenerated cellulose membrane (B) are compared.

Embodiment 2

[0026] Dissolve cotton linter cellulose in 5% NaOH / 5% thiourea aqueous solution to prepare a 5% cellulose solution, cast it on a glass plate to form a 1mm solution layer after defoaming, then pre-solidify in air for 10 minutes, and then Steadily immerse in 0.5% chitosan solution dissolved in 2% acetic acid aqueous solution for 10min, 60min, 180min or 600min, remove the film and wash it with water and dry it in the air to prepare composite films with different chitosan contents. The amount varies with the content of chitosan, see figure 2 .

Embodiment 3

[0028] Dissolve cotton linter cellulose in 7% NaOH / 4% thiourea aqueous solution to prepare a 4% cellulose solution. After defoaming, cast it on a glass plate to form a 0.5mm solution layer, and then pre-solidify in air for 10 minutes. Steadily immersed in 0.5% chitosan solution dissolved in 2% acetic acid aqueous solution for 3 hours, took out the membrane and washed it with water and dried it in the air. 2+ retention rate. The composite film on Cu 2+ The interception rate is above 90%, see image 3 .

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Abstract

The invention discloses pH-sensitive type cation regenerated cellulose composite film as well as a preparation method and application thereof, relating to a regenerated cellulose composite film and providing the pH-sensitive type cation regenerated cellulose composite film with excellent mechanical performance, high flux and entrapping rate on precious metallic ions, pH sensitivity, biocompatibility, bacteria restraint, and degradability as well as the preparation method and the application thereof. The cellulose composite film comprises the following components by weight percent: 80-99.9 percent of cellulose and 0.1-20 percent of chitosan; the cellulose composite film can be used in aspects of waste water treatment, the entrapment and the enrichment of precious metallic ions and heavy metallic ions, desalination and the like. The preparation method comprises the following steps of: after defoaming a cellulose solution, salivating on a substrate to form a solution layer, then solidifying to obtain a cellulose solution layer; dissolving the chitosan in a solvent to prepare a chitosan solution; immersing the solidified cellulose solution layer into the shitosan solution for cellulose regeneration and separation out to form a film, and cleaning the film, and drying by air.

Description

technical field [0001] The invention relates to a regenerated cellulose composite membrane, in particular to a preparation method and application of a pH-sensitive cationic regenerated cellulose composite membrane. Background technique [0002] As the global water resource problem becomes increasingly prominent, wastewater reuse technology has become one of the recent research hotspots. As a new generation of wastewater treatment technology, membrane separation technology can also separate, accumulate and desalt precious metals. It has the characteristics of high efficiency and energy saving, and has attracted more and more attention. It has developed rapidly and is widely and effectively used in petrochemical, Biochemical pharmaceuticals, medical and health, metallurgy, environmental protection and other fields have broad development prospects. However, the widespread application of membrane separation technology is hindered by problems such as membrane cost, high operatin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/10B01D69/12
Inventor 熊晓鹏段将将丁鸿娜
Owner XIAMEN UNIV
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