Preparation method of heavy metal contaminated soil passivator

A technology of polluted soil and passivating agent, applied in chemical instruments and methods, soil conditioning materials, and other chemical processes, can solve the problems of poor passivation effect, unstable adsorption and fixation of heavy metal ions, and single passivation mechanism. Achieve the effects of improving physical adsorption performance, improving cation exchange capacity, and best passivation effect

Inactive Publication Date: 2020-06-19
江苏和合环保集团有限公司
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Problems solved by technology

[0003] However, the adsorption and fixation of heavy metal ions by common heavy metal passivators is not stable at present, and the passivation mechanism is single, most of which are passivated by physical adsorption, and the passivation effect is not good. In view of the above defects, a heavy metal-contaminated soil passivation Chemical preparation method

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  • Preparation method of heavy metal contaminated soil passivator
  • Preparation method of heavy metal contaminated soil passivator

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preparation example Construction

[0030] A preparation method of heavy metal polluted soil passivation agent, the specific preparation steps are:

[0031] (1) Weigh the zeolite and put it into a pulverizer to pulverize for 20-30 minutes, collect the pulverized zeolite, mix the pulverized zeolite with a hydrochloric acid solution with a mass fraction of 5% at a mass ratio of 1:10, and put it into ultrasonic vibration In the instrument, immerse with ultrasonic vibration at a frequency of 20-30kHz for 10-20min. After the ultrasonic vibration is completed, filter and separate to obtain the filter residue, which is the modified zeolite;

[0032] (2) Mix the above-mentioned modified zeolite, mussel mucin and deionized water at a mass ratio of 1:1:8, put them in a stirrer, and stir at a speed of 200-300r / min for 20-30min to obtain mixture;

[0033] (3) Put the mixture obtained above into the reactor, then add catechol oxidase of 9% of the mixture mass in the reactor, seal the reactor, and use 100 to 200 r / h under th...

example 1

[0037](1) Preparation of modified zeolite: Weigh zeolite and put it into a pulverizer to pulverize for 20 minutes, collect the pulverized zeolite, mix the pulverized zeolite with 5% hydrochloric acid solution in a mass ratio of 1:10 Put it into an ultrasonic oscillator, and impregnate it with ultrasonic oscillation at a frequency of 20kHz for 10 minutes. After the ultrasonic oscillation is completed, filter and separate to obtain a filter residue, which is the modified zeolite;

[0038] (2) Preparation of the mixture: mix the modified zeolite obtained above with mussel mucin and deionized water in a mass ratio of 1:1:8, put them in a stirrer, and stir at a speed of 200r / min for 20min to obtain mixture;

[0039] (3) Preparation of pre-treated modified zeolite: put the mixture obtained above into a reactor, then add catechol oxidase with a mass of 9% of the mixture into the reactor, seal the reactor, and set the temperature at 40°C Stir and react at a speed of 100r / min for 3h, ...

example 2

[0043] (1) Preparation of modified zeolite: Weigh zeolite and put it into a pulverizer to pulverize for 25 minutes, collect the pulverized zeolite, mix the pulverized zeolite with 5% hydrochloric acid solution in a mass ratio of 1:10 Put it into an ultrasonic oscillator, and impregnate it with ultrasonic oscillation at a frequency of 25kHz for 15 minutes. After the ultrasonic oscillation is completed, filter and separate to obtain a filter residue, which is the modified zeolite;

[0044] (2) Preparation of the mixture: mix the modified zeolite obtained above with mussel mucin and deionized water in a mass ratio of 1:1:8, put them in a stirrer, and stir at a speed of 250r / min for 25min to obtain mixture;

[0045] (3) Preparation of pre-treated modified zeolite: put the mixture obtained above into a reactor, then add catechol oxidase with a mass of 9% of the mixture into the reactor, seal the reactor, and set the temperature at 44° C. Stir and react at a speed of 150r / min for 4...

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Abstract

The invention relates to a preparation method of a heavy metal contaminated soil passivator, and belongs to the technical field of soil heavy metal contamination treatment. Silicate mineral zeolite used as a raw material is crushed and then modified through acid dipping to obtain modified zeolite; the modified zeolite is mixed with mussel mucin with a dopa structure, and catechol oxidase is addedfor reaction to prepare pretreated modified zeolite; and then the pretreated modified zeolite, calcium nitrate, polyethylene glycol and sodium silicate are mixed for reaction to obtain the heavy metalcontaminated soil passivator. The prepared soil passivator has an excellent heavy metal passivation effect and a wide application prospect.

Description

technical field [0001] The invention relates to a preparation method of a heavy metal polluted soil passivator, belonging to the technical field of soil heavy metal pollution control. Background technique [0002] At present, soil heavy metals are irreversible and cannot be degraded. In farmland soil, they not only lead to the decline of soil fertility and crop yield, but also accumulate in organisms through the food chain, posing a serious threat to human health. According to the characteristics of heavy metals and the status of soil pollution, soil heavy metal pollution remediation methods can be divided into two categories: one is to remove heavy metals from soil by physical, chemical or biological methods, so that their concentration in the soil is close to or reaches the soil background value, although the effect of this method is good, but the cost is high; the second is to use the in-situ immobilization technology to add a suitable passivator to the soil to cause a se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K101/00C09K109/00
CPCC09K17/40C09K2101/00C09K2109/00
Inventor 孙乃明
Owner 江苏和合环保集团有限公司
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