Method for preparing activated carbon through walnut shells and application of activated carbon to degradation of substituted ureas herbicides isoproturon through specific adsorption-catalysis

A technology for preparing activated carbon and walnut shells, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc. The effect of strong adsorption performance

Inactive Publication Date: 2016-01-06
SHAANXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditionally prepared activated carbon has no catalytic effect on isoproturon

Method used

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  • Method for preparing activated carbon through walnut shells and application of activated carbon to degradation of substituted ureas herbicides isoproturon through specific adsorption-catalysis
  • Method for preparing activated carbon through walnut shells and application of activated carbon to degradation of substituted ureas herbicides isoproturon through specific adsorption-catalysis
  • Method for preparing activated carbon through walnut shells and application of activated carbon to degradation of substituted ureas herbicides isoproturon through specific adsorption-catalysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] h 3 PO 4 Preparation of impregnating material: Accurately weigh 5g of pretreated walnut shells of 40-120 mesh and place them in a beaker, and set the impregnating ratio according to the experiment (H 3 PO 4 The ratio of walnut shell mass) is 1:1 by adding 25mL of H 3 PO 4 solution, fully stirred and then sealed, dipped in an oven at 90°C for 15 hours, removed the seal, dried in an oven at 120°C for 12 hours, and stirred regularly to loosen, after drying, H 3 PO 4 Dipping material.

[0036] h 3 PO 4The impregnated material was then carbonized at 250°C for 60 minutes and activated at 500°C for 60 minutes. 2 Protect and cool down to room temperature to obtain the activated material. The activated material is acid-washed and washed with water, and dried to finally obtain the target product A.

[0037] Add 10 mg of target product A to 3 mL of isoproturon aqueous solution with a concentration of 100 μmol / L, and perform adsorption treatment and adsorption-catalysis s...

Embodiment 2

[0042] in H 3 PO 4 During the preparation of the impregnating material, according to the impregnating ratio of 2:1 (H 3 PO 4 Ratio to walnut shell mass) Add 25mL of H 3 PO 4 Solution, other steps and conditions are all the same as in Example 1, and target product B is obtained.

[0043] Using the target product B, according to the steps and conditions of Example 1, the adsorption-catalysis synergy treatment was carried out for 60 minutes, and the performance of the activated carbon material was evaluated by the above formula, reaching 83.14%.

Embodiment 3

[0045] in H 3 PO 4 During the preparation of the impregnating material, according to the impregnating ratio of 4:1 (H 3 PO 4 Ratio to walnut shell mass) Add 25mL of H 3 PO 4 Solution, other steps and conditions are all the same as in Example 1, and target product C is obtained.

[0046] Using the target product C, according to the steps and conditions of Example 1, the adsorption-catalysis synergy treatment was carried out for 60 minutes, and the performance of the activated carbon material was evaluated by the above formula, reaching 86.76%.

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Abstract

The invention relates to a method for preparing activated carbon through walnut shells and application of activated carbon to degradation of substituted ureas herbicides isoproturon through specific adsorption-catalysis. Firstly, the clean walnut shells are smashed and then placed in an H3PO4 solution to be steeped and dried, and H3PO4 steeped materials are obtained; the H3PO4 steeped materials are subjected to heat-preservation carbonization, then activation is performed, after activation is completed, cooling is performed under N2 protection till room temperature is achieved, and activated materials are obtained; the activated materials are subjected to acid pricking and then are washed in water to be neutral, and the activated carbon is obtained after drying. The preparation method of the activated carbon is simple in process, raw materials are easy to obtain, cost is low, the prepared activated carbon material has a large specific surface area and high adsorption performance, the porous structure is developed, chemical properties are stable, efficient catalytic degradation capacity can be achieved through cooperation with hydrogen peroxide, the activated carbon has efficient catalytic degradation capacity for substituted ureas herbicides isoproturon, the degradation rate is high, and the prepared activated carbon is convenient to recycle, capable of being reused and suitable for industrial application.

Description

【Technical field】 [0001] The invention belongs to the technical field of organic wastewater treatment, and in particular relates to a method for preparing activated carbon from walnut shells and its application in the degradation of the specific adsorption-catalyzed substituted urea herbicide isoproturon. 【Background technique】 [0002] my country is a big agricultural country and one of the big countries that consume and produce pesticides in the world. Isoproturon is a widely used herbicide that replaces urea. Due to its certain solubility in water, Isoproturon has been detected in groundwater and surface water in some countries, and the detected concentration exceeds range of standard concentrations. Studies have shown that isoproturon is very destructive to aquatic ecosystems, and isoproturon itself is a carcinogen. Therefore, the degradation of isoproturon has also aroused widespread concern. At present, there are many ways to deal with organic pesticides. Some trad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12C02F1/28C02F101/34C02F101/38
Inventor 蒋育澄张晓胡满成李淑妮翟全国
Owner SHAANXI NORMAL UNIV
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