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Method for removing chlorpyrifos from water body through adsorption of loess and clay minerals in dry farmland

A technology of clay minerals and chlorpyrifos, which is applied in adsorption water/sewage treatment, chemical instruments and methods, water pollutants, etc., to achieve the effect of strong practicability, good safety and easy operation

Inactive Publication Date: 2014-04-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ultrasound-assisted extraction of clay minerals from upland loess and its use in the adsorption and removal of pyrithione in water bodies has rarely been reported so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The method for removing pyrithione from the water body by adsorption of dry field loess clay minerals comprises the following steps,

[0021] The first step is to use NaAC-HAC buffer solution with a pH of 4.8 to remove carbonate from loess. The mass volume ratio of upland loess to NaAC-HAC buffer solution is 1:10g / mL, the ultrasonic power is 100W, and the ultrasonic time is 60min;

[0022] In the second step, use 30% H 2 o 2 Removal of organic matter in loess, upland loess and H 2 o 2 The mass volume ratio is 1:10g / mL, the ultrasonic power is 100W, and the ultrasonic time is 60min;

[0023] The third step is to filter and dry the mixture after washing with pure water three times (105±5°C, 12±1h) to obtain dry field loess clay minerals;

[0024] The 4th step, with the obtained upland loess clay mineral as adsorbent, carry out adsorption purification to the polluted water body containing pyrithione, the initial concentration of pyrithione is 10mg / L, the mass volume ra...

Embodiment 2

[0029] The method for removing pyrithione from the water body by adsorption of dry field loess clay minerals comprises the following steps,

[0030] In the first step, use NaAC-HAC buffer solution with a pH of 4.8 to remove carbonate from loess, the mass volume ratio of upland loess to NaAC-HAC buffer solution is 1:20g / mL, the ultrasonic power is 75W, and the ultrasonic time is 60min;

[0031] In the second step, use 30% H 2 o 2 Removal of organic matter in loess, upland loess and H 2 o 2 The mass volume ratio is 1:15g / mL, the ultrasonic power is 75W, and the ultrasonic time is 60min;

[0032] The third step is to filter and dry the mixture after washing with pure water three times (105±5°C, 12±1h) to obtain dry field loess clay minerals;

[0033] The 4th step, with the obtained upland loess clay mineral as adsorbent, carry out adsorption purification to the polluted water body containing pyrithione, the initial concentration of pyrithione is 10mg / L, the mass volume ratio ...

Embodiment 3

[0037] The method for removing pyrithione from the water body by adsorption of dry field loess clay minerals comprises the following steps,

[0038] In the first step, use NaAC-HAC buffer solution with a pH of 4.8 to remove carbonate from loess, the mass volume ratio of upland loess to NaAC-HAC buffer solution is 1:30g / mL, the ultrasonic power is 50W, and the ultrasonic time is 60min;

[0039] In the second step, use 30% H 2 o 2 Removal of organic matter in loess, upland loess and H 2 o 2 The mass-to-volume ratio is 1:20g / mL, the ultrasonic power is 50W, and the ultrasonic time is 60min;

[0040] The third step is to filter and dry the mixture after washing with pure water three times (105±5°C, 12±1h) to obtain dry field loess clay minerals;

[0041] The 4th step, with the obtained upland loess clay mineral as adsorbent, carry out adsorption purification to the polluted water body containing pyrithione, the initial concentration of pyrithione is 10mg / L, the mass volume rat...

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Abstract

The invention discloses a method for removing chlorpyrifos from a water body through adsorption of loess and clay minerals in a dry farmland. The method comprises the steps of firstly, putting a loess sample passing through a 1mm nylon screen into a triangular flask, and under the conditions of ultrasonic assistance and water bath heating at 80+ / -5 DEG C in the whole process, removing loess carbonate and organic matters respectively by a NaAC-HAC buffer solution of which the pH value is 4.8 and 30% H2O2; then washing the products repeatedly for three times by purified water, and filtering and drying the mixture to obtain loess and clay minerals without carbonate and organic matters; thirdly, adsorbing the chlorpyrifos in the water body by the prepared loess and clay minerals which are taken as an adsorbent; and finally, after absorption saturation, performing desorption by purified water under the condition of ultrasonic assistant stirring, and inspecting the recycling potential of the loess and clay minerals. The method is low in cost, simple and convenient in operation, high in practicability, good in safety and easy to popularize, and has a relatively good application potential for removing pesticide pollutants in pesticide wastewater and surface runoff of farmlands.

Description

technical field [0001] The invention belongs to the technical field of water body purification, and relates to a method for adsorbing and removing pyrithione from water, in particular to a method for adsorbing and removing pyrithione from water by using dry field loess clay minerals. Background technique [0002] Chlorpyrifos (C 9 h 11 Cl 3 NO 3 PS), also known as chlorpyrifos and Lesben, is a broad-spectrum insecticide developed by Dow Chemical Company in the United States. It has good insect control and insecticidal effects on a variety of farmland crops. Chlorpyrifos is one of the pesticide varieties with the largest production and usage in the world, and it has been widely used in many regions in China. At present, the utilization rate of pyrithione sprayed in the field is low, and most of it enters the soil system, and enters the water body with the surface runoff and underground runoff, becoming one of the main pesticide pollutants in the water body. The presence ...

Claims

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Application Information

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IPC IPC(8): C02F1/28B01J20/12B01J20/28B01J20/30C02F101/38
Inventor 范春辉
Owner SHAANXI UNIV OF SCI & TECH
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