A method for removing lead in heavy metal polluted soil by combined leaching of nanometer zero-valent iron and citric acid

A technology of nano-zero-valent iron and polluted soil, which is applied in the restoration of polluted soil, etc., to achieve the effects of enhanced leaching rate, obvious leaching effect, and large specific surface area

Inactive Publication Date: 2016-06-29
SICHUAN AGRI UNIV +1
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is to provide a method for removing lead in heavy metal-contaminated soil by using nanometer zero-valent iron and citric acid combined elution to solve the problems existing in the prior art in repairing heavy metal-lead-contaminated soil

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 removing lead in heavy metal polluted soil by combined leaching of nanometer zero-valent iron and citric acid
  • A method for removing lead in heavy metal polluted soil by combined leaching of nanometer zero-valent iron and citric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The leaching of embodiment 1 farmland lead-contaminated soil

[0022] The farmland lead-contaminated soil was collected from a polluted farmland in Wenjiang, Sichuan, and its lead content was measured to be 468.39mg / kg. Add different gradients of nano-zero-valent iron-citric acid composite solutions to the polluted soil at a liquid-solid ratio of 10:1 (ml / g), set up separate citric acid and nano-zero-valent -180r / min speed shaking and rinsing for 1h, the eluate was centrifuged at 4000r / min for 15min, the filtrate was collected through a 0.45μm filter membrane, and the Pb content in the eluent was determined by atomic absorption spectrophotometer (such as figure 1 ). Depend on figure 1 It can be seen that the leaching efficiency of single citric acid or nano-zero-valent iron to remove lead in farmland polluted soil is relatively low; the addition of nano-zero-valent iron enhances the leaching and removal of lead by citric acid. When the concentration is 2.0% (2.0g iro...

Embodiment 2

[0023] The leaching of embodiment 2 mine lead polluted soil

[0024] The mine soil was collected near the Tangjia lead-zinc mining area in Hanyuan, Sichuan, and its lead content was determined to be 563.73mg / kg. Add different gradients of nano-zero-valent iron-citric acid composite solutions to the polluted soil at a liquid-solid ratio of 10:1 (ml / g), set up separate citric acid and nano-zero-valent -180r / min speed shaking and rinsing for 1h, the eluate was centrifuged at 4000r / min for 15min, the filtrate was collected through a 0.45μm filter membrane, and the Pb content in the eluent was determined by atomic absorption spectrophotometer (such as figure 2 ). Depend on figure 2 It can be seen that the leaching efficiency of single citric acid or nano-zero-valent iron to remove lead in mine soil is low; the addition of nano-zero-valent iron enhances the leaching and removal of lead by citric acid. When the input amount of nano-zero-valent iron When it is 2.0% (2.0g iron / 100...

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
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for removing lead in heavy metal polluted soil by combined leaching of nanometer zero-valent iron and citric acid. The method is to add nanometer zero-valent iron to citric acid solution to make nanometer zerovalent iron-citric acid composite solution, then add the composite solution into lead-contaminated soil, vibrate at room temperature, rinse, centrifuge, and then filter membrane and collect the filtrate. The leach solution of the present invention is simple to prepare, has strong operability, and remarkable leaching effect, and the leaching rate of lead reaches 83.08%; the lead content in the soil after leaching meets the soil environmental quality standard, and the lead in the leach solution can pass Recycling by means of chemical precipitation, biological adsorption and other methods, the eluent meets the discharge standard and will not cause secondary pollution to the environment.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal-contaminated soil in the environment, in particular to a method for removing lead in heavy metal-contaminated soil by combined elution of nanometer zero-valent iron and citric acid. Background technique [0002] In recent years, soil heavy metal pollution has increasingly become one of the main problems endangering human life and health. Mining industry, smelting industry, electroplating industry, excessive application of fertilizers and pesticides in agriculture are the main sources of soil heavy metal pollution, especially in recent years, the non-standard treatment of electronic waste is the main cause of lead pollution. Soil heavy metal pollution can lead to the decline of soil fertility, the reduction of the yield and quality of agricultural products, and ultimately threaten the balance of the ecosystem and human health. According to reports, about 20% of the soil in my co...

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): B09C1/02
Inventor 张世熔王贵胤姚苹徐小逊李婷龚国淑蒲玉琳
Owner SICHUAN AGRI UNIV
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