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Modified nano zero-valent iron, a preparation method thereof and application on industrial seepage pit sediment heavy metal treatment

A nano-zero-valent iron modification technology, applied in the field of environmental restoration, can solve the problems of pure nano-zero-valent iron, such as limited effect, easy agglomeration, and easy oxidation, and achieve excellent stability, low preparation cost, and improved efficiency.

Inactive Publication Date: 2019-06-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the characteristics of high activity, easy oxidation, and easy aggregation of nano-zero-valent iron, the effect of pure nano-zero-valent iron in sediment remediation is limited. Therefore, nano-zero-valent iron is modified to ensure its stability and make it It is very important to be able to apply to sediment remediation

Method used

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  • Modified nano zero-valent iron, a preparation method thereof and application on industrial seepage pit sediment heavy metal treatment
  • Modified nano zero-valent iron, a preparation method thereof and application on industrial seepage pit sediment heavy metal treatment
  • Modified nano zero-valent iron, a preparation method thereof and application on industrial seepage pit sediment heavy metal treatment

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preparation example Construction

[0034] A kind of preparation method of modified nanometer zero valent iron of the present invention comprises the following steps:

[0035] (1) Nitrogen is passed through ultrapure water to remove dissolved oxygen as a solvent for preparing the solution;

[0036] (2) mix the sophorolipid with a mass percentage purity of not less than 50% with the ultrapure water prepared in step (1), and obtain a 0.05%-0.25wt% sophorolipid solution through ultrasonic treatment; The frequency is 40-60KHz, the processing time is 20-30min, and the processing temperature is 40°C.

[0037] (3) dissolving ferrous sulfate heptahydrate into the sophorolipid solution prepared in step (2) to obtain a ferrous sulfate-sophorolipid mixed solution. The ferrous sulfate concentration in the ferrous sulfate-sophorolipid mixed solution is 0.107-0.321mol / L, and the dissolution process is carried out under nitrogen atmosphere.

[0038] (4) dissolving sodium borohydride in the ultrapure water prepared in step (1...

Embodiment 1

[0046] In this embodiment, the modified nano-zero-valent iron includes nano-zero-valent iron and sophorolipids with a mass percentage purity of not less than 50%, and the sophorolipids are modified on the surface of the entire nano-zero-valent iron; The mass ratio of iron is 1:10. The particle size of the modified nano zero-valent iron is 100nm.

[0047] A preparation method of stable nanometer zero-valent iron in the above-mentioned embodiment, comprises the following steps:

[0048] (1) Nitrogen gas was passed through ultrapure water for 30 minutes to remove dissolved oxygen as a solvent for preparing the solution.

[0049] (2) Weigh 0.01g of sophorolipids into a beaker, add an appropriate amount of ultrapure water for ultrasonic treatment, the temperature is 40°C, the ultrasonic frequency is 40KHz, and the treatment time is 20min to dissolve it, and then transfer it to a 100mL volumetric flask , dilute to the mark with ultrapure water, shake well, and obtain a sophorolipi...

Embodiment 2

[0055] A modified nano-zero-valent iron, which is basically the same as the modified nano-zero-valent iron of Example 1, the difference is only that the mass ratio of sophorolipid and nano-zero-valent iron in Example 2 is 1:5, and the modified The particle size of the nanometer zero valent iron is 160nm.

[0056] A kind of preparation method of above-mentioned modified nanometer zero valent iron is basically the same as the preparation method of embodiment 1, and the difference is only in:

[0057] In step (2), the weight of the sophorolipid was changed to 0.005g, the ultrasonic frequency was 50KHz, the ultrasonic treatment time was 25min, and the concentration of the obtained sophorolipid solution was 0.05wt%.

[0058] Take FeSO in step (3) 4 ·7H 2 0 quality is 5.9572g, the obtained FeS0 4 -The concentration of the sophorolipid mixed solution is 0.214mol / L.

[0059] Take by weighing NaBH in step (4) 4 The mass is 1.6212g, and the obtained NaBH 4 The solution concentrati...

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Abstract

The invention discloses a preparation method and application of modified nano zero-valent iron. The preparation method comprises the following steps of dissolving ferrous sulfate salt in sophorolipidsolution, dropwise adding sodium borohydride solution into nitrogen atmosphere to carry out liquid-phase reduction to obtain the modified nano zero-valent iron. The modified nano zero-valent iron prepared has the advantages of being good in stability, good in dispersibility, strong in reaction activity, ecological friendly and the like, and has a good immobilization effect on Cd, Cr and Zn in heavy metal polluted sediment, and the content of Cd, Cr and Zn residues in the treated sediment is increased by 22.034%, 16.493% and 18.436% correspondingly, so that the modified nano zero-valent iron has excellent application value and wide application prospect for repairing heavy metal polluted sediment.

Description

technical field [0001] The invention belongs to the technical field of environmental restoration, and in particular relates to a modified nanometer zero-valent iron and its preparation method and application. Background technique [0002] In recent years, with the rapid development of China's industry, the environmental pollution problems caused by the extensive economy have become increasingly prominent, and the problem of industrial seepage pits is one of them. In many rural areas of our country, due to relatively backward management, there are many industrial seepage pits formed by illegal discharge from nearby factories. Studies have shown that heavy metal pollution in lake sediments near industrial and mining enterprises and human activity areas is serious, and the way of seepage pit sewage discharge is very easy to pollute shallow groundwater. Therefore, industrial seepage pits pose a huge threat to the water environment and soil environment. . The wastewater in thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/24B82Y30/00B82Y40/00C02F11/143C02F101/20
Inventor 季民潘陈鑫翟洪艳王一瑶
Owner TIANJIN UNIV
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