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Application of zirconium dioxide microspheres prepared by using microchannel injection auxiliary method to adsorptive enrichment of organophosphorus pesticide

A technology of organophosphorus pesticides and zirconia, which is applied in the direction of zirconia, microsphere preparation, microcapsule preparation, etc., can solve the problem of complex preparation process of magnetic materials, the effective adsorption and removal of high-concentration organophosphorus pesticide pollutants, and the adsorption capacity Not very strong and other problems, to achieve the effect of simple and easy control of the process, low cost and high yield

Inactive Publication Date: 2013-05-08
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of these magnetic materials is very complicated, and the adsorption capacity is not very strong. Although it can realize the trace detection of organophosphorus pesticide pollutants, it cannot be used for the effective adsorption and removal of high-concentration organophosphorus pesticide pollutants.

Method used

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  • Application of zirconium dioxide microspheres prepared by using microchannel injection auxiliary method to adsorptive enrichment of organophosphorus pesticide
  • Application of zirconium dioxide microspheres prepared by using microchannel injection auxiliary method to adsorptive enrichment of organophosphorus pesticide
  • Application of zirconium dioxide microspheres prepared by using microchannel injection auxiliary method to adsorptive enrichment of organophosphorus pesticide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of Zirconium Dioxide Microspheres

[0030] The preparation steps are as follows:

[0031] 1) Add 3.0 grams of chitosan to 100 mL of acetic acid aqueous solution with a volume concentration of 3%, and form a homogeneous solution under magnetic stirring; add 0.3 g of zirconium oxychloride octahydrate solid to chitosan under magnetic stirring In the acetic acid solution, continue magnetic stirring to mix into a homogeneous solution;

[0032] 2) Use a 2 mL syringe with a needle diameter of 0.5 mm to draw a full tube of homogeneous solution (2 mL), drop by drop at a height of about 6 cm to a volume of 55 mL of 3 mol / L sodium hydroxide In the petri dish of the solution, wherein the diameter of the petri dish is 8.7 cm, the volume of the sodium hydroxide solution installed at this time accounts for more than 2 / 3 of the volume of the petri dish. At this time, the sodium hydroxide solution will be greatly excessive. A spherical product is formed immediately. ...

Embodiment 2

[0036]Organophosphorus pesticide dichlorvos experiment in the zirconia microsphere material adsorption solution prepared in Example 1

[0037] 1. Weigh 30 mg of the obtained zirconia microsphere material adsorbent;

[0038] 2. Weigh the solid dichlorvos pesticide and dissolve it in methanol solution to prepare a concentration of 1000 mg L -1 Dichlorvos (DDVP) standard solution:

[0039] 3. Pipette the standard solution in step 2 and dilute it into 50 ml each of 150, 200, 270 and 300 mg / L simulated contamination solutions for later use:

[0040] 4. Adsorption experiment of dichlorvos in contaminated solution. The experiment was carried out at room temperature without adjusting the pH value of the sewage. The concentration of the zirconia material was 0.6 g / L. The timing was started after the adsorbent was evenly dispersed in the sewage. During the entire adsorption process, the oscillator was kept at 120 rpm. Sampling was carried out at different times, and the s...

Embodiment 3

[0044] 1. Weigh 25g each of small green vegetables and cucumber slice samples as actual samples;

[0045] 2. Add the weighed samples into the mortar respectively, add 5 g NaCl each and grind them;

[0046] 3. Transfer the ground sample to a conical flask, add 30 ml of acetonitrile, ultrasonic for 15 minutes, after cooling, centrifuge with a centrifuge and let it stand; transfer the organic phase to a 100 ml volumetric flask; continue to use acetonitrile for the remaining mother liquor Extract twice, and continue to transfer the organic phase solution to a volumetric flask. After the extraction is finished, add acetonitrile to the volumetric flask containing the acetonitrile solution to the mark;

[0047] 4. Transfer the acetonitrile solution obtained in the previous step to a 150 ml Erlenmeyer flask, add 0.1 g of the zirconia microspheres prepared in Example 1, and oscillate and adsorb for 90 minutes;

[0048] 5. After the adsorption is completed, take ou...

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Abstract

The invention discloses an application of zirconium dioxide microspheres prepared by using a microchannel injection auxiliary method to adsorptive enrichment of organophosphorus pesticide. According to the application, the zirconium dioxide microspheres are obtained by forming a support substance by taking a chitosan material as an intermediate product, taking zirconium oxychloride octahydrate, acetic acid and sodium hydroxide as raw materials and adopting a microchannel auxiliary method under the room temperature. Each zirconium dioxide microsphere is of a mesoporous structure and can be used for carrying out adsorptive enrichment on the organophosphorus pesticide within a shorter time and is free of secondary pollution; and the zirconium dioxide microspheres subjected to adsorption are easy to be successfully separated from a solution so as to carry out effective desorption on the pesticide, so that detection of pesticide residues in vegetables, such as brassicae chinensis and cucumbers are successfully achieved. The application disclosed by the invention has the advantages of capability of obtaining raw materials easily, simple process, environmental friendliness and low cost; and the zirconium dioxide microspheres are large in adsorbing capacity to multiple organophosphorus pesticides and good in separating effect and the like, not only can be used for environment detection of a trace amount of residues of organophosphorus pesticides of agricultural produces, but also can be used for adsorptive treatment to waste liquor of organophosphorus pesticides and accords with the demands of practical production.

Description

technical field [0001] The invention relates to a method for preparing zirconia microspheres for adsorption and enrichment of organophosphorus pesticides, in particular to mesoporous structure, micron particle size, selective adsorption and enrichment for organophosphorus pesticides, and convenient use and separation Preparation method of zirconia microspheres. Background technique [0002] Organophosphorus pesticides were developed to replace organochlorine pesticides. They are easier to degrade than organochlorine pesticides, and their pollution to the environment, harm to the ecosystem, and residues are not as common and prominent as organochlorine pesticides; Many varieties, wide range of control, low cost, high selective effect, small phytotoxicity, fast degradation in the environment, low residual toxicity, etc., are still widely used in the world and play an extremely important role. However, its disadvantage is that it is highly toxic to humans and animals, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/30B01J13/02C02F1/28C02F1/58C01G25/02
Inventor 龚静鸣邵秀兰蔺丽丽
Owner HUAZHONG NORMAL UNIV
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