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Bio-based amphoteric composite water purifying agent as well as preparation method and application thereof

A water purifier, bio-based technology, applied in chemical instruments and methods, plant fibers, textiles and papermaking, etc., can solve the problems of low pollutant selectivity and weak adsorption capacity, and achieve good oil removal effect and easy operation. , the effect of promoting the coalescence of oil droplets

Pending Publication Date: 2022-02-11
GUANGZHOU ZHENQING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most natural polysaccharides and celluloses have weak adsorption capacity for pollutants and low selectivity for pollutants.

Method used

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  • Bio-based amphoteric composite water purifying agent as well as preparation method and application thereof
  • Bio-based amphoteric composite water purifying agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A bio-based amphoteric composite water purifier is obtained by grafting and modifying kapok fiber with reactive polyamide chitosan thiocarbamate, and the grafting rate is 58%.

[0042] The specific preparation steps of the bio-based amphoteric composite water purifier are:

[0043] S1, Preparation of reactive polyamide chitosan thiocarbamate:

[0044] 1) Carboxymethyl reaction: Suspend 8 g of pulverized chitosan in 100 mL of isopropanol, swell at room temperature for 3 h to obtain a mixture; add 100 mL of 30% NaOH solution dropwise to the above mixture, stir evenly, freeze and alkalize for 8 h , then slowly add 100g of chloroacetic acid solution dropwise, after the dropwise addition, carry out water bath insulation at 50°C for 4h, finally adjust the pH to neutral, wash and dry with ethanol to obtain O-carboxymethyl chitosan;

[0045] 2) Polycondensation reaction: Add the above-mentioned O-carboxymethyl chitosan, organic amine diethylenetriamine, water-carrying agent xy...

Embodiment 2

[0054] A bio-based amphoteric composite water purifier is obtained by grafting and modifying kapok fiber with reactive polyamide chitosan thiocarbamate, and the grafting rate is 65%.

[0055] The specific preparation steps of the bio-based amphoteric composite water purifier are:

[0056] S1, Preparation of reactive polyamide chitosan thiocarbamate:

[0057] 1) Carboxymethyl reaction: Suspend 8 g of pulverized chitosan in 100 mL of isopropanol, swell at room temperature for 3 h to obtain a mixture; add 100 mL of 30% NaOH solution dropwise to the above mixture, stir evenly, freeze and alkalize for 8 h , then slowly add 100g of chloroacetic acid solution dropwise, after the dropwise addition, carry out water bath insulation at 50°C for 4h, finally adjust the pH to neutral, wash and dry with ethanol to obtain O-carboxymethyl chitosan;

[0058] 2) polycondensation reaction: add the above-mentioned O-carboxymethyl chitosan, organic amine polyethylene polyamine, water-carrying agen...

Embodiment 3

[0067] A bio-based amphoteric composite water purifier is obtained by grafting and modifying kapok fiber with reactive polyamide chitosan thiocarbamate, and the grafting rate is 40%.

[0068] The specific preparation steps of the bio-based amphoteric composite water purifier are:

[0069] S1, Preparation of reactive polyamide chitosan thiocarbamate:

[0070] 1) Carboxymethyl reaction: Suspend 8 g of pulverized chitosan in 100 mL of isopropanol, swell at room temperature for 3 h to obtain a mixture; add 100 mL of 30% NaOH solution dropwise to the above mixture, stir evenly, freeze and alkalize for 8 h , then slowly add 100g of chloroacetic acid solution dropwise, after the dropwise addition, carry out water bath insulation at 50°C for 4h, finally adjust the pH to neutral, wash and dry with ethanol to obtain O-carboxymethyl chitosan;

[0071] 2) polycondensation reaction: add the above-mentioned O-carboxymethyl chitosan, organic amine triethylenetetramine, water-carrying agent ...

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Abstract

The invention discloses a bio-based amphoteric composite water purifying agent which is obtained by grafting and modifying kapok fibers through reactive polyamide chitosan thiocarbamate. The chitosan / kapok fiber composite material not only retains the inherent excellent properties of non-toxicity, harmlessness, biocompatibility, degradability, macromolecular adsorption and the like of chitosan and kapok fiber, but also contains a multi-functional group compound containing a large number of amino groups, further nucleophilic substitution is conducted with carbon disulfide to form more -N-CSS- active sites, amphoteric functional groups such as positive ions and negative ions are both provided, flocculations are more and the deoiling effect is better. Meanwhile, due to graft copolymerization of the reactive polyamide chitosan thiocarbamate and the kapok fibers, the branching degree of the kapok fibers is increased, the molecular chain is long, a more developed net structure is formed, the bridging effect, the precipitation net capturing effect, the adsorption neutralization effect and the double-electrode-layer compression and solubilization effect on oil drops are higher, emulsified oil drops can be contacted more easily, oil drop coalescence is promoted through extrusion, and floc floating or sinking is promoted.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a bio-based amphoteric composite water purifier for wastewater treatment in environmental governance, and in particular to a preparation method and application of a bio-based amphoteric composite water purifier. Background technique [0002] In recent years, the development and utilization of biomass resources have attracted people's attention. According to their chemical composition, they can be divided into three categories, namely carbohydrates such as proteins, cellulose, and polysaccharides. Cellulose and polysaccharides are the most abundant biomass materials in nature, which have the advantages of being renewable, degradable, pollution-free, and low-cost. As people pay more attention to the ecological environment and sustainable development, more attention has been paid to the development and utilization of cheap and abundant biomass resources, especially the high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/56D06M15/59D06M15/03D06M13/11C08B37/08C08G69/40C08G69/48D06M101/06
CPCC02F1/285C02F1/56D06M15/59D06M15/03D06M13/11C08B37/003C08G69/40C08G69/48D06M2101/06
Inventor 陈萌萌宋澄章
Owner GUANGZHOU ZHENQING ENVIRONMENTAL PROTECTION TECH
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