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Novel soil heavy metal fixing agent and preparation method thereof

A technology of heavy metals and fixatives, applied in the field of soil remediation, can solve the problems of acidity of soil and low removal rate of heavy metals, and achieve the effects of increasing adsorption, increasing stability, and increasing contact points.

Pending Publication Date: 2021-08-06
武汉钜能科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a novel soil heavy metal fixative and its preparation method, which solves the technical problems of low removal rate of heavy metals by traditional soil heavy metal fixatives and acidic soil after restoration

Method used

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  • Novel soil heavy metal fixing agent and preparation method thereof
  • Novel soil heavy metal fixing agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A preparation method of a novel soil heavy metal fixative, comprising the steps of:

[0030] (1) Preparation of oligomeric xanthan gum: putting 5g of xanthan gum into an ultrasonic processor with a power of 300W and a frequency of 10kHz for ultrasonic treatment for 2min to obtain oligomeric xanthan gum;

[0031] (2) Preparation of polyhydroxy ferric phosphate: Dissolve 10 g of ferric chloride in 600 g of 1,2-propylene glycol solvent, then add 20 g of phosphoric acid therein, and react at 30° C. for 2 h. After the reaction, the reaction product is filtered, washed, Drying, crushing and sieving to obtain polyhydroxy iron phosphate;

[0032] (3) Preparation of modified polyhydroxy iron phosphate: put 20g of polyhydroxy iron phosphate, 30g of vinyl silane coupling agent, and 200mL of toluene into the reaction kettle, and react at 100°C for 10h. After the reaction, the reaction product was Filtration, washing, drying, crushing and sieving to obtain modified polyhydroxy ferr...

Embodiment 2

[0036] A preparation method of a novel soil heavy metal fixative, comprising the steps of:

[0037] (1) Preparation of oligomeric xanthan gum: putting 5g of xanthan gum into an ultrasonic processor with a power of 300W and a frequency of 10kHz for ultrasonic treatment for 2min to obtain oligomeric xanthan gum;

[0038] (2) Preparation of polyhydroxy ferric phosphate: dissolve 10 g of ferric chloride in 900 g of 1,2-propylene glycol solvent, then add 25 g of phosphoric acid therein, and react at 40° C. for 2 h. After the reaction, the reaction product is filtered, washed, Drying, crushing and sieving to obtain polyhydroxy iron phosphate;

[0039] (3) Preparation of modified polyhydroxy iron phosphate: put 20g of polyhydroxy iron phosphate, 40g of vinyl silane coupling agent, and 200mL of toluene into the reaction kettle, and react at 120°C for 10h. After the reaction, the reaction product was Filtration, washing, drying, crushing and sieving to obtain modified polyhydroxy ferr...

Embodiment 3

[0043] A preparation method of a novel soil heavy metal fixative, comprising the steps of:

[0044] (1) Preparation of oligomeric xanthan gum: putting 5g of xanthan gum into an ultrasonic processor with a power of 300W and a frequency of 10kHz for ultrasonic treatment for 2min to obtain oligomeric xanthan gum;

[0045] (2) Preparation of polyhydroxy ferric phosphate: dissolve 10 g of ferric chloride in 850 g of 1,2-propylene glycol solvent, then add 35 g of phosphoric acid therein, and react at 35° C. for 2 h. After the reaction, the reaction product is filtered, washed, Drying, crushing and sieving to obtain polyhydroxy iron phosphate;

[0046] (3) Preparation of modified polyhydroxy iron phosphate: put 20g of polyhydroxy iron phosphate, 45g of vinyl silane coupling agent, and 200mL of toluene into the reactor, and react at 100°C for 10h. After the reaction, the reaction product was Filtration, washing, drying, crushing and sieving to obtain modified polyhydroxy ferric phosp...

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Abstract

The invention discloses a novel soil heavy metal fixing agent and a preparation method thereof, and the preparation method comprises the following five steps: preparing oligomeric xanthan gum, preparing polyhydroxy iron phosphate, preparing modified polyhydroxy iron phosphate, preparing a polyhydroxy iron phosphate composite gel material, and preparing the soil heavy metal fixing agent. The preparation method comprises the following steps: preparing polyhydroxy phosphoric acid from ferric chloride, modifying polyhydroxy iron phosphate by using a vinyl silane coupling agent to prepare modified polyhydroxy iron phosphate and increase the dispersity of the polyhydroxy iron phosphate in an organic matter, and grafting the modified polyhydroxy iron phosphate and oligomerization xanthan gum by using potassium persulfate as a free radical initiator to prepare porous modified xanthan gum. The polyhydroxy iron phosphate is uniformly dispersed in the porous xanthan gum, so that the contact points of the polyhydroxy iron phosphate and heavy metals in the soil are increased, and the adsorption, complexation and precipitation of the heavy metals in the soil are facilitated.

Description

technical field [0001] The invention relates to the technical field of soil restoration, in particular to a novel soil heavy metal fixative and a preparation method thereof. Background technique [0002] Soil heavy metal pollution refers to the production and living activities of human beings such as mining, smelting, chemical industry, tanning, electric forging, sewage irrigation, pesticides, chemical fertilizers, etc., resulting in significantly higher heavy metal content in the soil than the original content, and leading to deterioration of the ecological environment quality. Heavy metals in soil have a long retention time and high bioavailability, and most heavy metals in soil do not undergo microbial or chemical degradation like organic pollutants. In recent years, incidents such as "blood lead", "cadmium rice" and "arsenic poisoning" have occurred continuously, making the problem of heavy metal pollution widely concerned by all walks of life. [0003] Polyhydroxyferri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K109/00C09K101/00
CPCC09K17/40C09K2109/00C09K2101/00
Inventor 张蓉李娇任嵬李鹏
Owner 武汉钜能科技有限责任公司
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