Preparation method of nanometer starch-based flocculating agent with heavy metal trapping effect

A nano-starch, heavy metal technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of loss of activity, low usage, low charge density, etc.

Inactive Publication Date: 2015-07-08
NORTHEAST NORMAL UNIVERSITY
View PDF3 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural organic polymer flocculants have a long history of application in water treatment, but their usage is lower than that of synthetic polymer floccul

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The invention provides a method for preparing a nano-starch-based flocculant with heavy metal trapping, which is characterized in that it comprises the following steps:

[0015] (1) Dissolve starch in sodium hydroxide / urea / water mixed solvent (the mixed solvent consists of 2-10% sodium hydroxide, 0-10% urea, and the rest is water), low temperature (-15°C) Or strong mechanical stirring at room temperature for 3 hours, freeze-thaw treatment, then dialysis, and freeze-drying to obtain nano-starch NSt;

[0016] (2) Dissolve NSt in 5.0% sodium hydroxide solution, adjust the pH value of the solution to be 10, after mechanical stirring, gradually add epichlorohydrin dropwise (the volume of epichlorohydrin is 0.5-3 of NSt weight ratio Times, volume unit is mL, weight unit is g), 30 ℃ oil bath, after reacting for 8 hours, cool to room temperature, adjust the pH value to 7 with hydrochloric acid. Then settle with ethanol, filter under reduced pressure, and obtain the crude produ...

Embodiment example 6-7

[0027] Implementation Case 6-7 Preparation of Crosslinked Nano-starch Acrylamide Polymer

[0028] Weigh 10g of CNSt1 and CNSt2 obtained in Case 4-5 and add them to a flask filled with distilled water, stir mechanically at a constant speed in an oil bath at 45°C to form a paste, then add 100mL of 40% acrylamide aqueous solution, weight, and under nitrogen protection, gradually Add 10 mL of 0.01 mol / L cerium ammonium nitrate solution dropwise, react for 3 hours, wash the crude product with ethanol sedimentation, and dry it in vacuum at 60°C to obtain cross-linked nano-starch acrylamide polymers CNSA1 and CNSA2. The grafting ratios of polyacrylamide were respectively 48% and 36%.

Embodiment example 8-9

[0029] Implementation Case 8-9 Preparation of Crosslinked Nano-starch Acrylamide Xanthate

[0030] Weigh 10 g of CNSA1 and CNSA2 obtained in Case 6-7, dissolve them in 15 mL of 30% sodium hydroxide solution, stir them magnetically, slowly drop them into 4 mL of carbon disulfide solution with a concentration of 1.5 mol / L, and react at 45°C for 2 hours, The crude product was washed 3 times with acetone solution and dried under vacuum at 60 °C to obtain cross-linked nano-starch acrylamide xanthate CNASX1 and CNASX2, a nano-starch-based sewage flocculant with heavy metal trapping.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a preparation method of a nanometer starch-based flocculating agent with a heavy metal trapping effect. The nanometer starch-based flocculating agent adopts nanometer starch as a basic skeleton, and the sewage flocculating agent with a heavy metal trapping effect is obtained on the basis of polymer modification. The preparation method of the nanometer starch-based flocculating agent comprises the following steps: 1, preparing nanometer starch by using a sodium hydroxide/urea/water mixed alkaline hydrolysis freeze-thawing process; 2, cross-linking the nanometer starch to obtain cross-linked nanometer starch; 3, initiating acrylamide free radical polymerization by the cross-linked nanometer starch to obtain a cross-linked nanometer starch acrylamide polymer; and 4, reacting the cross-linked nanometer starch acrylamide polymer with carbon disulfide under alkaline conditions to obtain cross-linked nanometer starch acrylamide xanthogenate with heavy metal trapping and flocculating effects. The nanometer starch-based flocculating agent prepared in the invention has flocculating and heavy metal trapping dual effects, has the advantages of small use amount, low treatment cost and high water purifying efficiency, is especially suitable for treatment of supplied municipal water, industrial wastewater and domestic sewage, and is an efficient environmentally-friendly organic polymeric flocculating agent.

Description

technical field [0001] The invention belongs to the technical field of organic polymers, and in particular relates to a preparation method of a nano-starch-based flocculant capable of trapping heavy metals. Background technique [0002] With the development of social industrialization and urbanization in our country, environmental problems characterized by intensified water pollution, dwindling water resources, and deteriorating water ecological environment have become increasingly serious, and have become a bottleneck restricting economic and social development. In the past 20 years, a large amount of industrial and domestic sewage has not met the standard discharge, which has aggravated water pollution, especially organic pollution, which has seriously affected the health of the population. [0003] Sewage purification treatment has become one of the important ways to solve this problem. The flocculation and sedimentation method is an economical and simple water treatment...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C08F251/00C08F220/56C08F8/34C08B31/00C02F1/56C02F1/62
Inventor 陈莉张拓锋翁云
Owner NORTHEAST NORMAL UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap