Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for sodium oxalate modified zero-valent iron to remove hexavalent chromium in water

A technology of zero-valent iron and sodium oxalate, which is applied to chemical instruments and methods, water pollutants, mining wastewater treatment, etc., can solve the problems of low activity of hexavalent chromium and poor reducing ability, and achieve high content, simple structure, and easy treatment. The effect of simple and easy process

Active Publication Date: 2022-02-01
HUAZHONG NORMAL UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for reducing and removing hexavalent chromium by reducing and removing hexavalent chromium with simple operation and pollution-free sodium oxalate modified zero-valent iron for the problem of low activity of reducing and removing hexavalent chromium
The invention solves the problem of poor reducing ability due to the existence of an oxide layer on the surface of zero-valent iron, and has the advantages of high efficiency, environmental friendliness, and no secondary pollution for the removal of hexavalent chromium, a water pollutant.

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
  • A method for sodium oxalate modified zero-valent iron to remove hexavalent chromium in water
  • A method for sodium oxalate modified zero-valent iron to remove hexavalent chromium in water
  • A method for sodium oxalate modified zero-valent iron to remove hexavalent chromium in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1 Effect of sodium oxalate modified zero-valent iron in controlling hexavalent chromium in polluted water

[0028] Weigh 4g of zero-valent iron, soak it in 0.2mol / L sodium oxalate solution for 1h, filter and wash, and dry the treated zero-valent iron under the protection of inert gas.

[0029] The zero-valent iron used in the inventive method and the zero-valent iron modified by sodium oxalate (the zero-valent iron used and the modified zero-valent iron by sodium oxalate are consistent with example 2), the result of the sample scanning electron microscope (SEM) shows (see figure 1 ): Compared with untreated zero-valent iron, the surface shell of zero-valent iron modified by sodium oxalate cracked and produced some fine crystal particles, which indicated that high concentration of sodium oxalate interacted with the surface shell of zero-valent iron. The reaction may be due to the replacement of the hydroxyl group on the surface of the zero-valent iron by oxala...

Embodiment 2

[0031] Example 2 The effect of different concentrations of sodium oxalate modified zero-valent iron in the treatment of hexavalent chromium in polluted water

[0032]Weigh 4g of zero-valent iron, soak it with 0mol / L, 0.10mol / L, 0.15mol / L, 0.20mol / L, and 0.25mol / L sodium oxalate solution for 2h, filter and wash, and the zero-valent iron after treatment is in the Dry under inert gas protection. Take 50mL of hexavalent chromium aqueous solution with a concentration of 2mg / L as the simulated wastewater, add 0.10g of zero-valent iron modified by sodium oxalate to it, put it in a shaker at a constant temperature of 25°C and rotate at 200rpm / min, take samples regularly, and use spectrophotometry Measure the concentration of hexavalent chromium. At the same time, untreated zero-valent iron was used as a control test, and the results are shown in Figure 6 . Figure 6 As shown, after reacting for 3 hours, the removal rate of hexavalent chromium in the modified zero-valent iron syste...

Embodiment 3

[0033] Example 3 Different treatment time sodium oxalate modified zero-valent iron treatment effect of hexavalent chromium in polluted water

[0034] Weigh 4g of zero-valent iron, soak in 0.20mol / L sodium oxalate solution for 0h, 0.5h, 1.0h, 1.5h, and 2h, filter and wash, and dry the treated zero-valent iron under the protection of inert gas. Take 50mL of hexavalent chromium aqueous solution with a concentration of 2mg / L as the simulated wastewater, add 0.25g of zero-valent iron modified by sodium oxalate into it, put it in a shaker at a constant temperature of 25°C and rotate at 200rpm / min, take samples regularly, and use spectrophotometry Measure the concentration of hexavalent chromium. At the same time, untreated zero-valent iron was used as a control test, and the results are shown in Figure 7 . Figure 7 As shown, after 3 hours of reaction, the removal rate of hexavalent chromium in the modified zero-valent iron system is higher than that in the unmodified system, and...

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
concentrationaaaaaaaaaa
concentrationaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for removing hexavalent chromium in water by modifying zero-valent iron with sodium oxalate. A method for removing hexavalent chromium in water by sodium oxalate-modified zero-valent iron, characterized in that the zero-valent iron is soaked in sodium oxalate solution for a period of time, then washed and dried to obtain sodium oxalate-modified zero-valent iron for use. Then sodium oxalate modified zero-valent iron is used to treat the heavy metal pollutants in the water body. Compared with other chemical or physical methods for treating zero-valent iron, the method provided by the invention is simple and easy to implement, and has the advantages of high efficiency, no pollution and environmental friendliness. It solves the problem of low activity of zero-valent iron in treating heavy metal pollutants, and is expected to be widely used in environmental pollution control.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to a repair method for heavy metal hexavalent chromium pollution in water bodies, which is suitable for treating hexavalent chromium heavy metal pollution in the fields of industry, agriculture, mining and the like. Background technique [0002] With the rapid development of industry, the pollution of heavy metals in surface and groundwater has become more and more serious, and incidents of heavy metal pollution in water bodies have been reported in most countries around the world. Unlike organic pollutants, heavy metals cannot be biodegraded, and are easy to accumulate in organisms and cause harm to organisms. Long-term exposure of human beings to toxic or carcinogenic heavy metal-polluted water bodies will cause various diseases and even cancer, leading to death . Such as chromium poisoning can lead to kidney failure, lung cancer and skin cancer. The ...

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 Patents(China)
IPC IPC(8): C02F1/70C02F101/22
CPCC02F1/705C02F2101/22C02F1/288B01J20/02B01J20/22C02F1/5209C02F1/62C02F1/683C02F2103/06C02F2103/10C02F2103/26
Inventor 张礼知廖敏子
Owner HUAZHONG NORMAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com