A method for simultaneously removing heavy metals-organic compound polluted water bodies using zero-valent iron-persulfate

A technology of persulfate and compound pollution, applied in water pollutants, chemical instruments and methods, reduced water/sewage treatment, etc. Simple preparation process

Active Publication Date: 2017-11-07
SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when nanoscale zero-valent iron removes heavy metals or organic pollutants, it will be oxidized to Fe 2+ , especially in systems with higher pH, there is a large amount of Fe 2+ It will easily cause iron hydroxyl precipitates to form on the surface of nano-zero-valent iron, prevent pollutants from contacting with the surface of nano-zero-valent iron particles, and cause a reduction in catalytic reduction activity

Method used

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  • A method for simultaneously removing heavy metals-organic compound polluted water bodies using zero-valent iron-persulfate
  • A method for simultaneously removing heavy metals-organic compound polluted water bodies using zero-valent iron-persulfate
  • A method for simultaneously removing heavy metals-organic compound polluted water bodies using zero-valent iron-persulfate

Examples

Experimental program
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Embodiment 1

[0029] Example 1: Preparation of Bentonite-loaded Nano Zero-Valent Iron

[0030] In a 200mL three-neck flask, add 50mL of the mixed solution (V 乙醇 :V 水=4:1), weighed 9.66g of ferric chloride hexahydrate and added to the mixed solution and stirred until completely dissolved. Next, weigh 2 g of bentonite and add it to a three-necked flask, and stir for 10 minutes under nitrogen protection to ensure complete and uniform mixing. Subsequently, prepare 100 mL of 0.93M NaBH 4 Solution, under the protection of nitrogen, add NaBH dropwise 4 The solution was added to the mixed solution in the three-necked flask, and continued to stir for 20min to make the NaBH 4 Reacts completely with ferric chloride to ensure Fe 3+ Completely reduced to zero valent iron. After the reaction was completed, the black solid in the three-neck flask was recovered by vacuum filtration, washed with ethanol, placed in a vacuum oven, dried at 75°C for 600 min, and then stored in a brown bottle filled with ...

Embodiment 2

[0032] The joint reaction of bentonite-loaded nano-zero-valent iron and potassium persulfate is adopted, that is, bentonite-loaded nano-zero-valent iron and potassium persulfate are simultaneously added to water containing Cr(Ⅵ) and phenol to remove water pollutants. The specific steps are: use a 100mL triangular flask as a reactor, and treat 30mL of water with a concentration of 20mg / L Cr(Ⅵ) and 10mg / L phenol, and the pH of the water is not adjusted, which is displayed as 5.6. Add potassium persulfate to reactor, make its final concentration be 1.00mM and the bentonite loaded nanometer zero-valent iron prepared by embodiment 1, make its final concentration be 0.50g / L, and reactor is placed on the oscillating stirrer, The rotating speed is 160rpm, and the reaction time is 30min. The specific results are shown in Table 1.

Embodiment 3

[0044] A 100mL triangular flask was used as the reactor, and the treatment object was 30mL of phenol water with a concentration of 10mg / L, and the pH of the water was adjusted to 3, 5, 7, 9, and 11, respectively. Add potassium persulfate to the reactor containing the water body of various pH values ​​respectively, make its final concentration be 1.00mM and the bentonite loaded nanometer zero-valent iron prepared by embodiment 1, make its final concentration be 0.50g / L, and The reactor was placed on an oscillating stirrer with a rotating speed of 160 rpm and a reaction time of 30 min, and the changes in the concentrations of Cr(VI) and phenol in the water before and after the reaction were measured. The result is as figure 1 shown, from figure 1 It can be seen that in the bentonite-supported nano-zero-valent iron-potassium persulfate joint system, after 30 minutes of reaction, the removal rate of Cr(Ⅵ) and phenol reached the maximum in the pH range of 3-5, and the removal rate...

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Abstract

The invention discloses a method for simultaneously removing heavy metal-organic compound polluted water by using zero-valent iron-persulfate. It is to add bentonite-loaded nanometer zero-valent iron and persulfate to water containing heavy metals and organic matter to form a multi-phase coexistence system to remove heavy metals and organic matter. The present invention utilizes bentonite-loaded nano-zero-valent iron-potassium persulfate combined method to simultaneously remove water containing Cr(VI) and phenol, not only utilizes the strong reducing properties of nano-zero-valent iron to remove heavy metal Cr(VI), but also fully utilizes The Fe2+ generated by nano-zero-valent iron in the reaction process activates potassium persulfate to continuously produce SO4-·oxidative degradation of phenol, and realizes the synergistic removal of heavy metal-organic complex polluted water.

Description

technical field [0001] The invention belongs to the field of heavy metal-organic pollutant treatment, in particular to a method for simultaneously removing heavy metal-organic compound polluted water by using zero-valent iron-persulfate. Background technique [0002] In the past ten years, the remediation technology of nanometer zero-valent iron (nZVI) has shown unique advantages in the remediation of water heavy metal and organic matter pollution in the environmental field and has attracted much attention. Nano-zero-valent iron has the advantages of active chemical properties, low price, wide sources, and good environmental safety, so it is considered to be a material with the most application potential for environmental pollution restoration and control. A large number of studies have shown that nano-zero-valent iron can effectively remove heavy metals in water through its strong reducibility, and has been widely used in environmental remediation of heavy metals such as Cd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/70C02F1/72C02F101/22C02F101/34
Inventor 刁增辉徐向荣
Owner SOUTH CHINA SEA INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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