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Modified FeS nano-particle as well as preparation method and application thereof

A nanoparticle and modification technology, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems that have not yet appeared in the study of FeS treatment of Cr, to ensure that COD discharges up to the standard and the treatment effect is good , the effect of promoting speed

Inactive Publication Date: 2015-04-01
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the repair treatment of Cr(VI) by nano-zero valent iron and sulfur iron has been studied a lot, but there is no research on the treatment of Cr(VI) by FeS

Method used

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  • Modified FeS nano-particle as well as preparation method and application thereof
  • Modified FeS nano-particle as well as preparation method and application thereof
  • Modified FeS nano-particle as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Add 0.1-0.5g PVPP to 50ml ultra-pure water, respectively, and stir for 10 minutes with nitrogen gas to obtain PVPP solution;

[0030] (2) Weigh 2.49g FeCl 2 4H 2 O, dissolved in 12.5ml deoxygenated ultrapure water to obtain FeCl 2 4H 2 O solution, the FeCl 2 4H 2 The O solution was added to the above PVPP solution, and stirred for 10 min under nitrogen to obtain a mixed solution;

[0031] (3) Weigh 3g Na 2 S·9H 2 O, dissolved in 12.5ml deoxygenated ultrapure water to obtain Na 2 S·9H 2 O solution, the Na 2 S·9H 2 The O solution was added dropwise to the above mixed solution, and stirred for 60 min under nitrogen;

[0032] (4) Then settle naturally, wash 3 times with anaerobic ultrapure water, obtain about 1.2g of FeS-PVPP nanoparticles (i.e. modified FeS nanoparticles), disperse 1.2g of FeS-PVPP nanoparticles in 120ml anaerobic Suspensions of modified FeS nanoparticles were prepared in ultrapure water.

[0033] For the modified FeS nanoparticles prepare...

Embodiment 2

[0043] (1) Weigh 0.25g of PVPP and add it into 50ml of ultrapure water, and stir for 10min under nitrogen gas to obtain PVPP solution.

[0044] (2) Weigh 2.49g FeCl 2 4H 2 O, dissolved in 12.5ml deoxygenated ultrapure water to obtain FeCl 2 4H 2 O solution, the FeCl 2 4H 2 The O solution was added to the above PVPP solution, and stirred for 10 min under nitrogen to obtain a mixed solution.

[0045] (3) Weigh 3g Na 2 S·9H 2 O, dissolved in 12.5ml deoxygenated ultrapure water to obtain Na 2 S·9H 2 O solution, the Na 2 S·9H 2 The O solution was added dropwise to the above mixed solution, and stirred for 60 min under nitrogen.

[0046] (4) Then settle naturally, wash 3 times with anaerobic ultrapure water, obtain about 1.2g of FeS-PVPP nanoparticles (i.e. modified FeS nanoparticles), disperse 1.2g of FeS-PVPP nanoparticles in 120ml anaerobic Suspensions of modified FeS nanoparticles were prepared in ultrapure water.

[0047] For the modified FeS nanoparticles prepared...

Embodiment 3

[0049] The modified FeS nanoparticles prepared in Example 2 and the FeS nanoparticles prepared in Comparative Example 1 were respectively treated with chromium-containing wastewater, and the specific operation steps were as follows:

[0050] Preparation of Cr(VI)-containing wastewater: the concentration of chromium-containing wastewater is 10mg / L, 50mg / L, 100mg / L, 200mg / L, 300mg / L, 400mg / L, 500mg / L, and the pH range is 2.8~ 3.1.

[0051] Concentration in 1.0ml embodiment 2 is 1.2g / 120ml modified FeS nanoparticle suspension and the FeS nanoparticle suspension that concentration is 1.1g / 110ml in 1.0ml comparative example 1 is added to above-mentioned different concentrations containing Cr ( VI) In wastewater, carry out constant temperature oscillation treatment at 35°C and 150rpm for 1 hour, then filter with a 0.45 μm filter membrane, take the filtered solution and measure residual Cr(VI) in wastewater by ultraviolet-visible light spectrometer, the results are shown in Table 2 b...

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Abstract

The invention provides a modified FeS nano-particle as well as preparation method and application thereof, wherein the modified FeS nano-particle comprises aFeS nano-particle and cross-linked polyvinylpyrrolidone; the cross-linked polyvinylpyrrolidone wraps on the surface of the FeS nano-particle to form a shell-core structure; the mass ratio of the cross-linked polyvinylpyrrolidone to the FeS nano-particle is (0.1-0.5):1.1. The preparation method of the modified FeS nano-particle c comprises the following step: importing N2 to stir and mix a cross-linked polyvinylpyrrolidone solution and a FeCl2.4H2O solution, dropwise adding an Na2F.9H2O solution under the condition of importing N2 and stirring to obtain the modified FeS nano-particle. The modified FeS nano-particle provided by the invention is high in reaction activity and large in specific surface area; both the Fe2+ and the S2- of the FeS nano-particle have reducing property and can be applied to the treatment of chromate wastewater, so that compared with the present widely applied zero-valent iron nano-particles, the modified FeS nano-particle is better in treatment effect.

Description

technical field [0001] The invention relates to the technical field of heavy metal wastewater treatment, in particular to a modified FeS nanoparticle and a preparation method thereof, and also relates to the application of the modified FeS nanoparticle to remove heavy metal chromium in water. Background technique [0002] Heavy metals are a class of residual and cumulative pollutants. With the development of mining, smelting, electroplating, chemical industry, electronics, leather and other industries, chromium pollutant leakage accidents have increased, civil solid wastes have been piled up and landfilled indiscriminately, and a large number of pesticides, The application of chemical fertilizers causes chromium pollutants to enter water bodies, and the pollution to the environment is becoming more and more serious. Among the types of heavy metal pollution, the prevalence of chromium pollution ranks second, second only to lead. Heavy metal chromium is also one of the priori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/12B82Y30/00
Inventor 许飘曾光明黄丹莲赖萃江辉陈明黄超危臻李宁杰陈国敏
Owner HUNAN UNIV
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