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
View PDF5 Cites 33 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap