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Easily desorbed and regenerated open-chain cucurbituril-based material for treating pesticide wastewater and preparation method thereof

A technology of pesticide wastewater and cucurbituril, which is applied in fiber treatment, separation methods, filter regeneration, etc., can solve the problems of poor product regeneration and recycling performance, narrow application range, poor environmental adaptability, etc., and achieve easy desorption, regeneration and recycling , Improving the mechanical properties and enhancing the effect of cross-linking

Pending Publication Date: 2021-06-18
JIANGSU NEW HORIZON ADVANCED FUNCTIONAL FIBER INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The present invention aims to solve the technical problems existing in the prior art, such as poor adsorption performance of organic pesticides, poor mechanical properties of products, unstable product quality, narrow application range, and poor performance of product regeneration and recycling caused by organic pesticide desorption, and provides An easily desorbed and regenerated open-chain cucurbituril-based material for treating pesticide wastewater and its preparation method, which can endow nanofiber membranes with unique molecular recognition capabilities, thereby being applied in the field of adsorption and separation of organic pesticides
This method solves many problems in the process of separation, adsorption and desorption of organic pesticides by nanofibrous membranes, such as poor environmental adaptability, low adsorption capacity, low selectivity of organic pesticides, and poor performance of organic pesticide desorption and regeneration. At the same time, the synthesis procedure is simple, Moderate conditions, with promotional value

Method used

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  • Easily desorbed and regenerated open-chain cucurbituril-based material for treating pesticide wastewater and preparation method thereof
  • Easily desorbed and regenerated open-chain cucurbituril-based material for treating pesticide wastewater and preparation method thereof
  • Easily desorbed and regenerated open-chain cucurbituril-based material for treating pesticide wastewater and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0060] A method for preparing an easily desorbed and regenerated open-chain cucurbituril-based material for treating pesticide wastewater, the specific steps are as follows:

[0061] (1) prepare cross-linked polyvinyl alcohol nanofiber membrane;

[0062] First, polyvinyl alcohol (PVA-1799) was dissolved in deionized water, and stirred at 90° C. for 3 hours to obtain a 10% (w / v) homogeneous solution. After natural cooling, 25% (PVA mass percent) glutaraldehyde was added to the above solution and continued to stir for 0.5 h. Put the above solution into the belt with 7 # (0.7mm internal diameter) in a 10mL syringe with a flat needle. Using a constant flow syringe pump at 0.5mL·h -1 The flow rate of the polymer solution was delivered, and the voltage was set at 13 kV. The aluminum foil is used as the receiving screen, and the receiving distance between the needle and the aluminum foil is set to 15 cm. All electrospinning was performed at 25 °C and 40% relative humidity. The ...

Embodiment 2

[0074] A method for preparing an easily desorbed and regenerated open-chain cucurbituril-based material for treating pesticide wastewater, the specific steps are as follows:

[0075] (1) Preparation of crosslinked polyvinyl alcohol electrospun nanofiber membrane and reaction solution:

[0076] Preparation of cross-linked polyvinyl alcohol electrospun nanofibrous membranes:

[0077] (1) Polyvinyl alcohol is dissolved in deionized water, and the heating temperature is mixed under a constant temperature condition of 80° C. to obtain a homogeneous solution whose mass fraction of polyvinyl alcohol is 10%;

[0078] (II) Add glutaraldehyde into the homogeneous solution and stir for 0.5h to obtain spinning solution; wherein, the mass ratio of polyvinyl alcohol to dialdehyde is 2:1;

[0079] (III) Using a constant flow syringe pump with a delivery flow rate of 0.4mL h -1 Convey the polymer solution, set the voltage to 12kV, aluminum foil as the receiving screen, the receiving distanc...

Embodiment 3

[0088] A method for preparing an easily desorbed and regenerated open-chain cucurbituril-based material for treating pesticide wastewater, the specific steps are as follows:

[0089] (1) Preparation of crosslinked polyvinyl alcohol electrospun nanofiber membrane and reaction solution:

[0090] Preparation of cross-linked polyvinyl alcohol electrospun nanofibrous membranes:

[0091] (1) Polyvinyl alcohol is dissolved in deionized water, and the heating temperature is mixed under a constant temperature condition of 82° C. to obtain a homogeneous solution whose mass fraction of polyvinyl alcohol is 12%;

[0092] (II) Add adipaldehyde into the homogeneous solution and stir for 0.5h to obtain spinning solution; wherein, the mass ratio of polyvinyl alcohol to dialdehyde is 3:1;

[0093] (III) Using a constant flow syringe pump with a delivery flow rate of 0.4mL h -1 Convey the polymer solution, set the voltage to 13kV, use the aluminum foil as the receiving screen, the receiving d...

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Abstract

The invention relates to an easily desorbed and regenerated open-chain cucurbituril-based material for treating pesticide wastewater and a preparation method thereof. The preparation method comprises the following steps: firstly, carrying out electrostatic spinning by taking polyvinyl alcohol and dialdehyde as main raw materials, and then cross-linking in a strong acid methanol solution to form a film; and grafting and modifying the open-chain cucurbituril to the surface of the nanofiber membrane, wherein the open-chain cucurbituril is of a structure with a carbamido repeating unit of 6. The open-chain cucurbituril-based material prepared by the method is good in mechanical property, the tensile strength is 40-70MPa, and the elastic modulus is 1500-2500MPa; the material has high adsorbability on common organic pesticides such as viologen (paraquat), diquat, triclosan, dieldrin and the like, and the maximum adsorption rate reaches 90% or above; the material is easy to desorb and regenerate, desorption can be completed after the material is washed with p-methylbenzyl alcohol and water, and the adsorption rate is still more than 80% after five times of adsorption-desorption cycles. The preparation method is efficient and practical; the material prepared by the method has good mechanical properties and high adsorbability and is easy to desorb and regenerate.

Description

technical field [0001] The invention belongs to the technical field of pesticide wastewater treatment, and relates to an easily desorbed and regenerated open-chain cucurbit urea-based material for treating pesticide wastewater and a preparation method thereof. Background technique [0002] For a long time, under the huge population pressure, China has been committed to increasing the output of agricultural products, thus using a large amount of chemical pesticides to achieve the goal. Although the use of a large number of pesticides provides security for agricultural production, pesticides, as a toxic substance, also have their negative effects. At present, there are about 500 kinds of artificially synthesized pesticides. The extensive use of these pesticides not only pollutes the environment, but also harms human health. After pesticides are applied to crops, only a small number of pesticides are effectively used by crops, and most of the rest flow into rivers with sewage,...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30B01J20/34C02F1/28D01D5/00D04H1/4309D04H1/728C02F101/30
CPCB01J20/267B01J20/28011B01J20/3475C02F1/285D04H1/728D01D5/003D04H1/4309C02F2101/306
Inventor 赵润韦甜
Owner JIANGSU NEW HORIZON ADVANCED FUNCTIONAL FIBER INNOVATION CENT CO LTD
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