Method for treatment of hexavalent chromium water with modified iron-copper bimetallic nanoparticles

A bimetallic nanometer and hexavalent chromium technology, which is applied in the field of hexavalent chromium-polluted water bodies, can solve problems such as low activity, easy oxidation, and uneven dispersion, so as to avoid contact with oxygen, accelerate electron transfer, and improve The effect of transfer efficiency

Active Publication Date: 2019-01-15
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a commonly used nanomaterial, nano-zero-valent iron is widely used in the treatment of heavy metal-polluted wastewater. However, nano-zero-valent iron has the following problems in actual field applications: it is easy to agglomerate and oxidize during use, which limits The mobility and reducibility of nano-ZVI, which affects the reactivity and processing efficiency of the material
Compared with nano-zero-valent iron, bimetallic nano-zero-valent iron can significantly improve the reaction activity and processing efficiency, but bimetallic nano-zero-valent iron still has problems such as easy agglomeration and oxidation during use, which cannot meet the needs of practical applications. , and the existing bimetallic nano-zero-valent iron mostly uses noble metals as doping components, noble metals are expensive and may have potential ecotoxicity
In view of the above problems, in...

Method used

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  • Method for treatment of hexavalent chromium water with modified iron-copper bimetallic nanoparticles
  • Method for treatment of hexavalent chromium water with modified iron-copper bimetallic nanoparticles
  • Method for treatment of hexavalent chromium water with modified iron-copper bimetallic nanoparticles

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Experimental program
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Effect test

Embodiment 1

[0040] A method for treating hexavalent chromium water with modified iron-copper bimetallic nanoparticles, comprising the following steps:

[0041] Take 7 parts of Cr(VI) polluted groundwater with a volume of 100mL and an initial concentration of 100mg / L. (CS-Fe / Cu-1), mixed evenly, and treated at a constant temperature of 25°C for 90min.

[0042] After the reaction was completed, extract 1mL supernatant with a 1mL syringe, filter through a 0.45 μm filter to obtain the filtrate, measure the concentration of residual Cr(VI) in the filtrate by ultraviolet spectrophotometry, and calculate the removal rate of Cr(VI), the result As shown in Table 3 below.

[0043] Control group: Take 7 parts of Cr(VI) polluted groundwater with a volume of 100mL and an initial concentration of 100mg / L. Particles (Fe / Cu), mixed evenly, and treated at a constant temperature of 25°C for 90min.

[0044] After the reaction was completed, extract 1mL supernatant with a 1mL syringe, filter through a 0.4...

Embodiment 2

[0067] A method for treating hexavalent chromium water with modified iron-copper bimetallic nanoparticles, comprising the following steps:

[0068] Weigh respectively the modified iron-copper bimetallic nanoparticles (CS-Fe / Cu-1), starch-modified iron-copper bimetallic nanoparticles (ST-Fe / Cu), carboxymethyl cellulose in 0.05g embodiment 1 Modified iron-copper bimetallic nanoparticles (CMC-Fe / Cu), were added to Cr(VI)-contaminated groundwater with a volume of 100mL, a pH of 7.0, and an initial concentration of 100mg / L, and mixed evenly. Under constant temperature conditions, constant temperature treatment was carried out for 90 minutes.

[0069] After the reaction was completed, extract 1mL supernatant with a 1mL syringe, filter through a 0.45 μm filter to obtain the filtrate, measure the concentration of residual Cr(VI) in the filtrate by ultraviolet spectrophotometry, and calculate the removal rate of Cr(VI), the result As shown in Table 1 below.

[0070] Table 1 Treatment...

Embodiment 3

[0076] A method for treating hexavalent chromium water with modified iron-copper bimetallic nanoparticles, comprising the following steps:

[0077] Add 0.05 g of modified iron-copper bimetallic nanoparticles (CS-Fe / Cu-2) into Cr(VI)-contaminated groundwater with a volume of 100 mL, a pH of 7.0, and an initial concentration of 100 mg / L. Constant temperature treatment under constant temperature conditions.

[0078] When the reaction time is 10min, 15min, 20min, 30min, 40min, 60min, 90min, extract 1mL supernatant with a 1mL syringe, filter through a 0.45μm filter to obtain the filtrate, and measure residual Cr(VI) in the filtrate by UV spectrophotometry concentration, and calculate the removal rate of Cr(VI), the results are shown in Table 2 below.

[0079] Table 2 The treatment effect of modified iron-copper bimetallic nanoparticles of the present invention on Cr(VI) polluted groundwater under different treatment time conditions

[0080] time (min)

10

15

20 ...

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Abstract

The invention discloses a method for treatment of hexavalent chromium water with modified iron-copper bimetallic nanoparticles. The method includes the steps of: mixing the modified iron-copper bimetallic nanoparticles with hexavalent chromium water, and performing constant temperature treatment to complete treatment of hexavalent chromium water. Specifically, the modified iron-copper bimetallic nanoparticles include chitosan and iron-copper bimetallic nanoparticles, and the chitosan is coated on the surfaces of iron-copper bimetallic nanoparticles. The method for treatment of hexavalent chromium water with modified iron-copper bimetallic nanoparticles provided by the invention has the advantages of simple operation, low cost, short treatment period, high reaction efficiency and the like,can treat high concentration Cr (VI) polluted underground water, also has a wide pH application range, thus being a novel restoration method that has good application prospects and can effectively remove Cr (VI) from underground water.

Description

technical field [0001] The invention belongs to the field of treatment of hexavalent chromium-polluted water bodies, and relates to a method for treating hexavalent chromium water bodies, in particular to a method for treating hexavalent chromium water bodies with modified iron-copper bimetallic nanoparticles. Background technique [0002] With the rapid development of the economy and the acceleration of urbanization, a large amount of untreated industrial wastewater, random stacking of solid waste, and the use of a large amount of pesticides and fertilizers have caused a variety of heavy metals to continuously enter the environment and seep into groundwater. As a persistent pollutant, heavy metals have received extensive attention and attention. Due to the high stability and refractory nature of heavy metals, it is difficult to treat them. Therefore, the treatment of heavy metal polluted wastewater has become a global environmental problem, and its treatment is imminent. ...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/24B01J20/28B01J20/30C02F1/28C02F101/22
CPCB01J20/0229B01J20/0237B01J20/24B01J20/28007B01J20/28019C02F1/285C02F2101/22
Inventor 姜丹妮曾光明黄丹莲赖萃许飘张辰程敏刘洋万佳薛文静王晗
Owner HUNAN UNIV
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