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In-situ fixative for estrone-contaminated soil, and preparation method and application thereof

An in-situ immobilization and soil technology, applied in the field of environmental engineering, can solve the problems of low adsorption capacity, high modifier usage, complex modification process, etc., to improve specific surface area, good adsorption and holding effect, and change surface structure Effect

Inactive Publication Date: 2019-01-11
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an in-situ fixative for estrone-contaminated soil and its preparation method and application in view of the deficiencies in the prior art, so as to solve the problem of using modified biochar as a soil in-situ fixative The adsorption capacity is not high, and the modification process is complex and the amount of modifier used is high.

Method used

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  • In-situ fixative for estrone-contaminated soil, and preparation method and application thereof
  • In-situ fixative for estrone-contaminated soil, and preparation method and application thereof
  • In-situ fixative for estrone-contaminated soil, and preparation method and application thereof

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preparation example Construction

[0027] Specifically, a preparation method of nano-iron-manganese modified litchi biochar, comprising the steps of:

[0028] A. Take lychee wood strips, wash them three times with deionized water, dry to constant weight, and obtain lychee biomass after crushing.

[0029] B. Pyrolyzing the lychee biomass raw material in step A under anaerobic conditions, grinding and sieving the obtained solid material to obtain lychee biochar.

[0030] C. Prepare a mixed solution of potassium permanganate and ferric chloride, add potassium permanganate and ferric chloride crystals into the aqueous solution, stir well and then mix.

[0031] D. The lychee biochar obtained in step B is ultrasonically mixed with the mixture of potassium permanganate and ferric chloride solution, and reacted for 2 hours.

[0032] E. Vibrating, vacuum heating, washing, drying, and sieving the mixture obtained in step D to obtain nano-iron-manganese modified litchi biochar.

[0033] In step A of the preparation meth...

Embodiment 1

[0047] The preparation method of nano-iron-manganese modified lychee biochar of the present embodiment comprises the following steps:

[0048] A. Take fresh lychee wood strips and cut them into thin strips of 1-2 cm with scissors, clean the lychee wood strips with deionized water; put the cleaned lychee wood strips into an oven at 105° C. to dry to constant weight. The lychee wood strips dried to constant weight are crushed into lychee biomass.

[0049] B. Place the lychee biomass in a tube furnace, heat it under high temperature vacuum for 2 hours at 650°C, and heat up at a rate of 5°C / min, and feed N into the tube furnace 2 As shielding gas, N 2 The ventilation rate is 10mL / min. Then, under the condition of nitrogen protection, the carbonized product was naturally cooled and passed through a 60-mesh sieve.

[0050] C. Dissolve 40g of litchi biochar in 40mL of 0.1mol / L ferric chloride and 40mL of 0.1mol / L potassium permanganate mixed solution, the solid-liquid ratio is 1:2...

Embodiment 2

[0055] The prepared nano-iron-manganese modified lychee biochar was used in the experiment of controlling the migration of estrone pollution in soil:

[0056] A. Put the 60-mesh modified litchi biochar and soil mixture with a mass ratio of 3:100 in a beaker, and stir evenly with a glass rod.

[0057] B. The design of the leaching device for adding modified litchi biochar to soil is as follows, using a 100mL glass tube. The dimensions of the glass tube are: height 15 cm, diameter 1.5 cm. Fill the bottom of the glass tube with 2cm thick quartz sand as a supporting layer, and spread steel mesh to prevent the leakage of quartz sand and soil leaching out, and then fill the fresh soil to a height of 10cm. The compactness of the soil is consistent with the actual soil, about 1.13g / cm 3 , to ensure that the compaction degree of the soil in the soil column is consistent with that of the actual soil. And lay 1cm thick quartz sand and 6-7mm glass marbles on the upper layer to facilita...

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Abstract

The invention discloses an in-situ fixative for estrone-contaminated soil, and a preparation method and an application thereof. The above repairing material is nanometer iron-manganese modified litchibiochar prepared by high-temperature anaerobic rapid pyrolysis. The preparation method of the nanometer iron-manganese modified litchi biochar comprises the following steps: mixing the prepared litchi biochar with a 0.1 mol / L potassium permanganate solution and a 0.1 mol / L ferric chloride solution, carrying out an ultrasonic reaction at 40 DEG C for 2 h, oscillating the obtained solution at normal temperature for 2 h, and carrying out high-temperature anaerobic rapid pyrolysis to the obtain the nanometer iron-manganese modified litchi biochar. When the estrone-contaminated soil is doped withthe nanometer iron-manganese modified litchi biochar, estrone is not detected in a leachate within 96 h. The nanometer iron-manganese modified litchi biochar can realize the reuse of solid wastes in the forestry and fruit industry, and effectively control the migration of estrone in soil contaminated due to livestock and poultry breeding and significantly reduce the risk of estrone contamination.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to an in-situ fixative for estrone-contaminated soil, a preparation method and application thereof. Background technique [0002] In natural water bodies, the concentration of estrogen at the ng / L level can cause problems such as feminization of male fish, reproductive abnormalities, and sex ratio imbalance. Therefore, the pollution control of estrogen is very important for ecological security. As a typical estrogen, estrone is frequently detected in the soil downstream of sewage treatment plants and around livestock and poultry breeding areas, and it exists in the soil environment for a longer time than other natural estrogens. The impact is more far-reaching. Therefore, reducing the mobility of estrone in the soil environment and effectively controlling its pollution risk has important practical value and scientific significance. [0003] At present...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/32B09C1/00
CPCB01J20/06B01J20/20B01J20/3204B01J20/3214B01J20/3234B09C1/00
Inventor 史江红郭伟陶寰宇张梦涛张家玮葛卉张扬
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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