A modified nanomaterial and its application in antimony-containing wastewater treatment

A nanomaterial and modification technology, applied to the modified nanomaterial and its application in the treatment of antimony-containing wastewater, can solve the problems of reducing the reactivity, reducing the mobility, and high surface energy, and improving the dispersibility and stability. , Improve the removal effect, increase the effect of the specific surface area

Active Publication Date: 2021-10-22
YIYANG SHENGLI CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are many problems in the practical application of nZVI: the surface energy of nZVI is high and magnetic, and it is easy to agglomerate to form chains or larger aggregates, which reduces the specific surface area and reduces the mobility in soil voids and groundwater; the reducibility of nZVI Very strong, so the chemical properties are unstable, the surface is covered by iron oxide or oxyhydroxide, forming a passivation layer will reduce the reactivity; at the same time, nZVI has a very small particle size, it is difficult to separate in practical applications, and it is easy to lose, resulting in Secondary pollution, bringing potential ecological and environmental risks

Method used

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  • A modified nanomaterial and its application in antimony-containing wastewater treatment
  • A modified nanomaterial and its application in antimony-containing wastewater treatment
  • A modified nanomaterial and its application in antimony-containing wastewater treatment

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preparation example Construction

[0039] The invention provides a method for preparing an iron-based nanomaterial iron-based nanomaterial, which is characterized in that it comprises the following steps:

[0040] S1, preparation of modified stabilizer;

[0041] S2. Preparation of modified nano-zero-valent iron: according to a certain mass ratio, weigh ferrous sulfate heptahydrate and loading material, dissolve in deionized water, take 100mL of loading material and ferrous sulfate mixed solution into a three-necked flask, stir , feed nitrogen, add 50mL of absolute ethanol, continue to stir for 20-30min, add dropwise the green tea extract, and slowly add the solution of step S1, then microwave radiation for 3-5min (preferably, for example 3min, 3.2min , 3.8min, 4min, 4.1min, 4.8min, 5min, etc.), continue to stir, fully react until the solution is black, and then ultrasonically treat it for 4-8min (preferably, such as 4min, 4.1min, 4.2min, 5min, 6min, 6.2 min, 6.9min, 8min, etc.), vacuum filtration, repeated was...

Embodiment 1

[0047] A method for preparing iron-based nanomaterials, comprising:

[0048] Modification of starch with ethylenediaminetetraacetic acid and malic acid: Add 5g of starch and 100mL of 0.4mol / L NaOH solution into a four-necked flask, heat to 75°C, and keep stirring during the period. After the starch is fully gelatinized for 1, Add ethylenediaminetetraacetic acid (the mass ratio of solid starch to ethylenediaminetetraacetic acid is 1:1.8), vacuumize, reduce the pressure of the reaction system to 0.095MPa, then raise the temperature to 80°C, react for 8h, and wait for the reaction system to drop to 0.095MPa. After room temperature, acetone was added, and a thick white viscous product was obtained after settling, suction filtration and drying.

[0049] Preparation of modified nano-zero-valent iron: Mix 100mL of modified starch solution with a mass concentration of 3g / L and 100mL of 1mol / L ferrous sulfate solution, stir for 30min under the condition of nitrogen gas, and then drop i...

Embodiment 2

[0051] A method for preparing iron-based nanomaterials, comprising:

[0052] Modification of starch with ethylenediaminetetraacetic acid: Add 5g of starch and 100mL of 0.4mol / L NaOH solution into a four-neck flask, heat to 75°C, and keep stirring during the period. After the starch is fully gelatinized for 1, add ethylene diamine tetraacetic acid Amine tetraacetic acid (the mass ratio of solid starch to ethylenediamine tetraacetic acid is 1:1.8), add malic acid (the mass ratio of solid starch to malic acid is 1:2.3), vacuumize, and reduce the pressure of the reaction system to 0.095MPa , and then heated to 80 ° C, the reaction 8h.

[0053] Preparation of modified nano-zero-valent iron: Mix 100mL of modified starch with a mass concentration of 3g / L and 100mL of 1mol / L ferrous sulfate solution, stir for 30min under the condition of nitrogen gas, and then drop into 100mL of 2.5mol / L Potassium borohydride solution, stirring while adding dropwise, continue to stir for 5 minutes a...

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Abstract

The invention provides a modified nano-material and its application in the treatment of antimony-containing wastewater, belonging to the technical field of environmental protection. The modified nano-material includes nano-zero-valent iron and a stabilizer; wherein, the stabilizer is selected from starch, polyethylene One of the diols, the stabilizer is modified with EDTA or EDTA and malic acid. The nanomaterial can reduce CO 3 2‑ with PO 4 3‑ OH produced by hydrolysis in aqueous solution ‑ with Sb(OH) on the adsorbent surface 6‑ Produce competitive adsorption and improve the removal effect on Sb(V). The present invention also provides a method for preparing iron-based nanomaterials, which can increase the specific surface area of ​​the loaded material, increase the -COOH or -OH on the surface of the loaded material, increase the adsorption sites of the loaded material to antimony, and is green and environmentally friendly , The characteristics of cost reduction.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a modified nanometer material and its application in the treatment of antimony-containing wastewater. Background technique [0002] In recent years, the pollution of heavy metals, organic matter, and new trace pollutants in surface water, groundwater, and soil has become more and more serious. Finding efficient, green, and sustainable treatment methods has always been a research hotspot for researchers. Using iron-based materials as remediation agents to remediate contaminated sites is one of the common green remediation technologies. Nanoscale zero-valent iron has the characteristics of environmental friendliness, low cost, and high remediation efficiency. Its remediation of polluted water and soil has attracted extensive attention from researchers. Nano zero-valent iron (nZVI) particles have a particle size of 1-100nm, have special small size effec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/70C02F101/20
CPCB01J20/02B01J20/20B01J20/22B01J20/24B01J20/265C02F1/288C02F1/705C02F2101/20
Inventor 梁耘侨唐磊
Owner YIYANG SHENGLI CHEM IND
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