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A modified nano-ferrous sulfide composite material and its preparation method and application

A technology of ferrous sulfide and composite materials, which is applied in the field of water treatment, can solve the problems of low chemical reactivity, large van der Waals force, and agglomeration inactivation, and achieve the effects of inhibiting agglomeration, improving migration ability, and enhancing dispersion ability

Active Publication Date: 2022-04-15
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, FeS nanoparticles synthesized by the traditional co-precipitation method are prone to agglomeration and deactivation due to factors such as large van der Waals force, high surface energy, and high density, so that they will be trapped in the porous medium due to deposition during the migration process. hinder its migration
Bare FeS nanoparticles with low chemical reactivity are difficult to disperse in subsurface aquifer media, limiting their role in environmental remediation

Method used

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  • A modified nano-ferrous sulfide composite material and its preparation method and application
  • A modified nano-ferrous sulfide composite material and its preparation method and application
  • A modified nano-ferrous sulfide composite material and its preparation method and application

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preparation example Construction

[0053] Optionally, the preparation method further includes a step of solid-liquid separation after standing.

[0054] Optionally, the solid-liquid separation includes at least one of vacuum filtration and centrifugation.

[0055] Optionally, the drying step is to dry the solid phase obtained by solid-liquid separation.

[0056] Optionally, the drying includes at least one of vacuum drying, freeze drying, and vacuum freeze drying.

[0057] The present invention also provides an application of the modified nano-ferrous sulfide composite material as described in any one of the above-mentioned schemes in the treatment of heavy metal-containing wastewater.

[0058] The present invention also provides an application of the modified nano-ferrous sulfide composite material as described in any one of the above-mentioned schemes in the in-situ restoration of groundwater polluted by heavy metals.

[0059] The sericin involved in the examples was purchased from Ningshan Guosheng Biotech...

Embodiment 1

[0061] This embodiment relates to a modified nano-ferrous sulfide composite material, wherein, in terms of ferrous ions, the molar ratio of sericin and ferrous sulfide in the composite material is 0.001:1, and the composite material is prepared according to the following steps:

[0062] S1. Water deoxygenation treatment: put 500mL Wahaha pure water in a beaker, 2 1h, remove the dissolved oxygen in the water.

[0063] S2. Solution preparation: use the deoxygenated pure water obtained in step S1 to prepare a 1% sericin solution, and dilute 20 mL of the 1% sericin solution to 100 mL;

[0064] Using the deoxidized pure water obtained in step S1 to prepare a 0.0228M ferrous sulfate solution;

[0065] Using the deoxidized pure water obtained in step S1 to prepare a 0.0228M sodium sulfide solution;

[0066] S3, in N 2 Under the protection of , add ferrous chloride solution 50mL that prepares to the sericin solution obtained in step S2;

[0067] S4, in N 2 Under protection, add 5...

Embodiment 2-5

[0073] Embodiment 2-5 relates to a kind of modified nano ferrous sulfide composite material, the difference between embodiment 2-5 and embodiment 1 is only, in embodiment 2-5, in terms of ferrous ion, the silk in the composite material The molar ratios of collagen and ferrous sulfide were 0.0001, 0.0005, 0.002, and 0.005, respectively.

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Abstract

The invention relates to the technical field of water treatment, in particular to a modified nano-ferrous sulfide composite material and a preparation method and application thereof. The modified nano ferrous sulfide composite material includes sericin and nano ferrous sulfide. The invention combines the sericin protein on the surface of the nano-ferrous sulfide, thereby increasing the electrostatic repulsion and steric hindrance between the nano-ferrous sulfide particles, thereby inhibiting the agglomeration between the nano-ferrous sulfide particles. And the sedimentation rate of the formed composite material is significantly reduced, and the oxidation resistance and migration ability in saturated porous media are significantly improved. Moreover, sericin and nano-ferrous sulfide can realize the synergistic removal of heavy metals in sewage.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a modified nano-ferrous sulfide composite material and a preparation method and application thereof. Background technique [0002] With the rapid development of modern industry, the pollution of groundwater environment is becoming more and more serious. Among them, the organic and heavy metal pollutants in urban decommissioned industrial lands have strong biological toxicity. If they are not properly repaired and treated, they will not only affect the reutilization process of decommissioned sites, but also directly endanger human health and ecological security. Pollutant remediation technologies mainly include ex-situ remediation technology and in-situ remediation technology. In the process of pollutant remediation, the remediation of underground aquifers is the most challenging. Ex-situ remediation technology has high cost and low efficiency. However, the in-situ repair...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/70C02F1/28C02F101/20C02F103/06
CPCC02F1/70C02F1/286C02F2101/20C02F2103/06
Inventor 张彤刘振海陈威
Owner NANKAI UNIV