Method for preparing heavy metal ion adsorption resin by taking chitosan oligosaccharide as porogen
A heavy metal ion, adsorption resin technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of difficult granulation of cross-linked chitosan, limited application scope, slow sedimentation, etc., and achieve non-toxic biological phase. Capacitance, increase mechanical properties, the effect of simple method
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
preparation example Construction
[0009] A preparation method of a heavy metal ion adsorption resin using chitosan oligosaccharide as a porogen. The specific method includes the following steps: (1) making the viscosity between 15~45 cps and the degree of deacetylation between 85%~95%. The chitosan in between is dissolved in 2% acetic acid or lactic acid aqueous solution, and after it is completely dissolved, chitosan oligosaccharide with a molecular weight between 2000 and 5000 Da is added to fully stir and dissolve to obtain a mixed solution of chitosan and chitosan oligosaccharide , the total concentration of the mixed solution is 5~7% (w / v), the ratio of chitosan and chitooligosaccharide in the mixed solution is 6:1~8:1; (2) chitosan and chitooligosaccharide Add the mixed solution of sugar to the dispersed phase solvent containing emulsifier, keep the temperature at 20~30°C, react for 30~50 minutes, add pre-crosslinking agent to the mixed solution, react for 50~80 minutes, wash with water for 30~60 minutes ...
Embodiment 1
[0017] 3.0 g of chitosan with a viscosity of 45 cps and a degree of deacetylation of 90% was fully dissolved in 50 ml of 2% acetic acid aqueous solution, and then 0.43 g of chitosan with a molecular weight of 5000 Da was added to fully dissolve to obtain chitosan Mixed solution with chitosan. With 250 ml of toluene as the dispersed phase, add 0.8 ml of Tween-80 and 0.8 ml of Span-80 as emulsifiers, and mix well. Add the mixed solution of chitosan and chitosan oligosaccharide into the dispersed phase containing emulsifier, react at 25°C for 40 min, add 15 ml of formaldehyde for pre-crosslinking for 60 min, stop the reaction, wash with water for 30 min and wash with 50%, 75 % and 100% ethanol for fractional dehydration, separated and dried to obtain 1.45 g of pre-crosslinked resin. The pre-crosslinked resin was added to 150 ml of glutaraldehyde aqueous solution with a mass concentration of 0.05%, and reacted at a constant temperature of 60 °C for 18 h, and after separation, it ...
Embodiment 2
[0019] 7.0g viscosity is 30cps, and the degree of deacetylation is 95% chitosan fully dissolved in 140 ml 2% acetic acid aqueous solution, then add 1.1g molecular weight is 3000Da chitosan oligosaccharide fully dissolves, makes chitosan and chitosan A mixed solution of oligosaccharides. With 1120 ml of liquid paraffin as the dispersed phase, add 4.5 ml of Tween-80 and mix well. Add the mixed solution of chitosan and chitosan oligosaccharide into the dispersed phase containing emulsifier, react at 20°C for 35 min, add 28 ml formaldehyde for pre-crosslinking for 50 min, stop the reaction, wash with water for 50 min, wash with 50%, 75 % and 100% ethanol for fractional dehydration, separated and dried to obtain 3.22 g of pre-crosslinked resin. Add the pre-crosslinked resin to 300 ml of 0.05% aqueous epichlorohydrin solution, react at a constant temperature of 55 °C for 12 h, and then add it to 350 ml of 0.1 mol / L hydrochloric acid aqueous solution for 14 h at a constant temperatu...
PUM
Property | Measurement | Unit |
---|---|---|
molecular weight | aaaaa | aaaaa |
particle size | aaaaa | aaaaa |
particle diameter | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com