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Method for removing heavy metal and organic matter composite pollutants in water body by means of zero-valent iron and persulfate

A persulfate and compound pollution technology, applied in water pollutants, chemical instruments and methods, reduced water/sewage treatment, etc., can solve the problem of reduced catalytic reduction activity, and achieve easy recycling, wide range, and low energy consumption Effect

Active Publication Date: 2015-12-02
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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  • Method for removing heavy metal and organic matter composite pollutants in water body by means of zero-valent iron and persulfate
  • Method for removing heavy metal and organic matter composite pollutants in water body by means of zero-valent iron and persulfate
  • Method for removing heavy metal and organic matter composite pollutants in water body by means of zero-valent iron and persulfate

Examples

Experimental program
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Effect test

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 as follows: use a 100mL triangular flask as the reactor, and treat 30mL of water with a concentration of 20mg / LCr(Ⅵ) and 10mg / L phenol, and the pH of the water is not adjusted, showing 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-loaded 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 of...

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Abstract

The invention discloses a method for removing heavy metal and organic matter composite pollutants in a water body by means of zero-valent iron and persulfate. According to the method, bentonite-supported nanoscale zero-valent iron and persulfate are added to the water body containing heavy metal and organic matters, a multi-phase coexistent system is formed, and the heavy metal and the organic matters are removed. Cr(VI) and phenol contained in the water body can be removed simultaneously with the bentonite-supported nanoscale zero-valent iron and potassium persulfate combined method, the heavy metal Cr(VI) is removed through the strong reduction performance of the nanosacle zero-valent iron, Fe2+ generated by the nanoscale zero-valent iron in the reaction process is fully used to activate potassium persulfate, so that SO4<->* is continuously generated to oxidize and degrade phenol, and the heavy metal and organic matter composite pollutants in the water body are removed synergistically.

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 Applications(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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