Non-destructive repairing method for heavy metal contaminated soil
A technology of polluted soil and remediation method, which is applied in the field of non-destructive remediation of heavy metal-contaminated soil, which can solve the problems of large amount of adsorbent, increased soil remediation cost, and small adsorption capacity, and achieves low processing cost, fast adsorption rate, and high absorption capacity. big effect
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Embodiment 1
[0024] A non-destructive restoration method for heavy metal contaminated soil, comprising the following steps:
[0025] (1) Preparation of adsorbent:
[0026] (a) Dissolve 1 mol of 1,4,7-triazacyclononane-1,4,7-triacetic acid in a biological buffer with a pH of 5.3-5.5, and add 10 mol of catalyst EDC·HCl and 5molNHS, stirred at room temperature for 1.5h to obtain the activated intermediate of the azamacrocyclic carboxylic acid derivative;
[0027] (b) adding Fe to the activation intermediate of the azamacrocyclic carboxylic acid derivative obtained in step (a) 3 o 4 Magnetic nanoparticles as the core, SiO 2 In order to protect the shell layer, the shell layer contains nanoparticles with terminal amino structure. After ultrasonic dispersion, react at 25±5°C for 8 hours. After the reaction, use a magnet to separate the product and wash it alternately with 0.1mol / L HCl solution, ethanol and water The product was dried several times in vacuum for 10 hours to obtain the adsorbe...
Embodiment 2
[0031] (1) Preparation of adsorbent:
[0032] (a) Dissolve 1 mol of 1,4,7,10,13,16-hexaazacyclooctadecane-1,4,7,10,13,16-hexaacetic acid in a biological buffer with a pH of 5.3-5.5 , under the protection of nitrogen, add 40mol catalyst EDC·HCl and 15molNHS, stir at room temperature for 3h, and obtain the activated intermediate of the azamacrocyclic carboxylic acid derivative;
[0033] (b) adding Fe to the activation intermediate of the azamacrocyclic carboxylic acid derivative obtained in step (a) 3 o 4 Magnetic nanoparticles as the core, SiO 2 In order to protect the shell layer, the shell layer contains nanoparticles with terminal amino structure. After ultrasonic dispersion, react at 25±5°C for 10 hours. After the reaction, the product is separated with a magnet and washed alternately with 0.1mol / L HCl solution, ethanol and water The product was dried several times in vacuum for 20 hours to obtain the adsorbent;
[0034] (2) Use a rotary tiller to crush a piece of dry s...
Embodiment 3
[0037] (1) Preparation of adsorbent:
[0038] (a) Dissolve 1 mol of 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid in a biological buffer solution with a pH of 5.3-5.5, and add 20 mol of Catalyst EDC·HCl and 7mol NHS, stirred at room temperature for 1.8h to obtain the activated intermediate of the azamacrocyclic carboxylic acid derivative;
[0039] (b) adding Fe to the activation intermediate of the azamacrocyclic carboxylic acid derivative obtained in step (a) 3 o 4 Magnetic nanoparticles as the core, SiO 2In order to protect the shell layer, the shell layer contains nanoparticles with terminal amino structure. After ultrasonic dispersion, react at 25±5°C for 8.5h. After the reaction, use a magnet to separate the product, and wash it alternately with 0.1mol / L HCl solution, ethanol and water The product was dried several times in vacuum for 12 hours to obtain the adsorbent;
[0040] (2) Use a rotary tiller to crush a piece of dry soil polluted by heavy metals. Th...
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