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

Preparation method and device of organic functional group modified nano zero-valent iron repairing agent

A technology of organic functional groups and nano-zero-valent iron, which is applied in chemical instruments and methods, mixers, transportation and packaging, etc., can solve the problems of low repair efficiency and rebound of repair effect, and achieve low repair cost, high repair efficiency, and reduced Effects on Mobility and Bioavailability

Pending Publication Date: 2021-03-23
北京贵清科技有限公司
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method and device for preparing a nano-zero-valent iron repair agent modified by an organic functional group, which can inhibit the oxidation and agglomeration of the nano-zero-valent iron (NZVI) surface through load modification and encapsulation modification, and increase the specific surface area. , provide more reactive sites, improve the reactivity and adsorption performance of NZVI, and then use the organic chelation of the surface active groups of nanoparticles to passivate and fix the reduction products in soil colloids to solve the physical problems in the prior art. The technical problems of low repair efficiency and easy rebound of repair effect in restoration method, biological restoration method and chemical restoration method

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
  • Preparation method and device of organic functional group modified nano zero-valent iron repairing agent
  • Preparation method and device of organic functional group modified nano zero-valent iron repairing agent
  • Preparation method and device of organic functional group modified nano zero-valent iron repairing agent

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0048] Such as Figure 4 As shown, the present invention provides a method for preparing an organic functional group modified nanometer zero-valent iron restoration agent, comprising specific steps:

[0049] S100. Hydrolyzing the biological by-products by high-temperature cooking to obtain a preliminary hydrolyzate; subjecting the preliminary hydrolyzate to high-temperature puffing and cracking, followed by dehydration, drying and pulverization, and finally obtaining a modified biological preparation of amino acid active groups;

[0050] S200, configuring the modified biological preparation of the amino acid active group into a solution, adding an iron salt solution to the solution for mixing and modification, and fully stirring and mixing to form a chelate mixture;

[0051] S300. Add borohydride salt solution dropwise to the chelate mixture, and obtain a black suspension of nanometer zero-valent iron through liquid phase reduction reaction, and perform suction filtration and ...

specific Embodiment

[0093] Specific embodiment one of the present invention for repairing soil of unmodified repairing agent and modifying agent through amino acid modification (governance of hexavalent chromium pollution in soil):

[0094] Test site: a chromium slag landfill in Shandong; Pollution type: Soil Cr(VI) pollution; Pollution degree: Cr(VI) pollution concentration is about 1×104mg / kg; Pollution source: Chromium slag is randomly piled up, rain leaching into the soil ; Restoration method: use iron-copper bimetallic nanoparticles (Fe / Cu), modified iron-copper bimetallic nanoparticles (AA-Fe / Cu) and pre-adjust the pH to 3, and the initial pollution concentration of Cr(VI) is 9610mg / kg of soil was mixed evenly at a ratio of 1:10, and repaired at a constant temperature of 25°C.

[0095] After standing still and waiting for the repair effect, samples were taken to detect the residual concentration of Cr(VI) in the soil, and the removal rate of Cr(VI) in the soil was calculated by different m...

specific Embodiment 2

[0099] Specific embodiment two of the present invention (control of hexavalent chromium pollution in water):

[0100] Test sample: chromium-contaminated water sample; sample source: Yuxing chromium slag landfill; pollution degree: Cr(VI) concentration 1370mg / kg; repair method: amino acid biological agent (nano zero-valent iron modifier) ​​and chromium-contaminated water Samples were mixed at a mass ratio of 1:15, and repaired at room temperature.

[0101] After standing still and waiting for the restoration to be completed, filter the supernatant to detect the residual concentration of Cr(VI) in the water sample, and analyze the chelation effect of amino acid biological preparations (nano-zero-valent iron modifier) ​​on hexavalent chromium.

[0102] The test results showed that Cr(VI) was not detected in the water samples, and the preliminary results showed that amino acid biological preparations have a strong chelation effect on Cr(VI), and can form stable macromolecules with...

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

No PUM Login to View More

Abstract

The invention discloses a preparation method of an organic functional group modified nano zero-valent iron repairing agent, which comprises the following steps: preparing an amino acid modified solution, and carrying out mixed modification on the amino acid modified solution and an iron salt solution to form a chelate mixed solution; then adding a borohydride solution, carrying out a liquid-phasereduction reaction to prepare a nano zero-valent iron black turbid liquid, carrying out suction filtration and solid-liquid separation to obtain a black solid preparation, and using the black solid preparation to prepare a turbid liquid; and adding a copper sulfate solution into the turbid liquid to obtain a modified nano bimetallic particle, and conducting drying to obtain a nano bimetallic particle sample. A preparation device of the repairing agent comprises a shell and a centrifugal stirring device, an extrusion molding device is arranged at the bottom of the centrifugal stirring device, and a temperature control device is arranged at the extrusion end of the extrusion molding device. According to the invention, the surfaces of the nano iron-copper bimetallic particles are coated withthe organic chelating agent to form the repairing agent with certain dispersity and a stable structure, hexavalent chromium in soil can be effectively adsorbed and converted, and the characteristics of simple and easy operation and high remediation efficiency are achieved.

Description

technical field [0001] The invention relates to the technical field of soil treatment, in particular to a method and a device for preparing an organic functional group modified nanometer zero-valent iron restoration agent for treating hexavalent chromium pollution in site soil. Background technique [0002] With the rapid development of the country, the rapid advancement of industrialization and urbanization, the pollution of hexavalent chromium in the soil of our country has become increasingly prominent. In particular, the pollution of hexavalent chromium in soil caused by chromium salt production, sewage irrigation, transportation, industrial discharge, textile printing and dyeing, and atmospheric deposition is becoming more and more serious. In nature, chromium usually exists in two stable valence distributions of trivalent and hexavalent. In the soil environment, trivalent chromium often exists in the form of Cr3+ cations, with relatively low oxidation activity and rela...

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
IPC IPC(8): B01J20/22B01J20/30B01F13/10B01J2/20B09C1/08B09C1/00
CPCB01J20/223B01J20/3021B01J20/3007B01J2/20B09C1/08B09C1/085B09C1/00B01F33/831
Inventor 曹磊宋贵民杜丽阳仲雪莲阿荣其其格仲崇军孙琴王毅
Owner 北京贵清科技有限公司
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