Unlock instant, AI-driven research and patent intelligence for your innovation.

A modified superparamagnetic Fe 3 o 4 Preparation method and application of nanoparticles

A nanoparticle, superparamagnetic technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., can solve the problems of low utilization value, high consumption of iron plates, etc., and achieve the preparation cost. The effect of low, low preparation conditions and high adsorption rate

Active Publication Date: 2018-01-12
KUNMING UNIV OF SCI & TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this process is that the consumption of iron plates is large, and there is a large amount of iron hydroxide mixed in the sludge, which has low utilization value.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: The modified superparamagnetic Fe 3 O 4 The preparation method of nanoparticle NFCC is as follows:

[0015] (1) Add 0.57g nanometer Fe 3 O 4 Disperse into 100mL deionized water, after ultrasonic dispersion for 30min, in N 2 Under protection, heat to 80℃ while stirring to obtain a suspension, add 1mol / L Na 2 SiO 3 The solution was added dropwise to the suspension and stirred, where Na 2 SiO 3 The volume ratio of the solution to the suspension is 1:3, and then slowly add 1.5mol / L HCl solution to adjust the pH to 5.5; the mixture is aged at 80°C for 2 hours, and then washed with deionized water to neutrality. Fe 3 O 4 @SiO 2 Nanoparticles;

[0016] (2) The Fe synthesized in step (1) 3 O 4 @SiO 2 Put 1.2g of nanoparticles into 1mol / L 100mL HCl solution and let stand for 8h, then wash with pure water to neutrality, and then rinse with ethanol, the washed 1.1g Fe 3 O 4 @ SiO 2 Disperse into 100mL ethanol to obtain a suspension. Disperse the suspension ultrasonically for ...

Embodiment 2

[0022] Example 2: The modified superparamagnetic Fe 3 O 4 The preparation method of nanoparticle NFCC is as follows:

[0023] (1) Add 0.6g nanometer Fe 3 O 4 Disperse into 100mL deionized water, after ultrasonic dispersion for 40min, in N 2 Under protection, heat to 75℃ while stirring to obtain a suspension, add 1.2mol / L Na 2 SiO 3 The solution was added dropwise to the suspension and stirred, where Na 2 SiO 3 The volume ratio of the solution to the suspension is 9:29, then slowly add 1.6mol / L HCl solution to adjust the pH to 6.0; the mixture is aged at 75°C for 2.3 hours, and then washed with deionized water to neutrality. Fe 3 O 4 @SiO 2 Nanoparticles;

[0024] (2) The Fe synthesized in step (1) 3 O 4 @SiO 2 Put 1.3g of nanoparticles in a 1.2mol / L 100mL HCl solution and let stand for 10h, then wash with pure water to neutrality, and then rinse with ethanol, the washed 1.2g Fe 3 O 4 @ SiO 2 Disperse into 100mL ethanol to obtain a suspension. Disperse the suspension ultrasonically f...

Embodiment 3

[0030] Example 3: The modified superparamagnetic Fe 3 O 4 The preparation method of nanoparticle NFCC is as follows:

[0031] (1) Add 0.65g nanometer Fe 3 O 4 Disperse in 100mL deionized water, after ultrasonic dispersion for 50min, in N 2 Under protection, heat to 60℃ while stirring to obtain a suspension, add 1.3mol / L Na 2 SiO 3 The solution was added dropwise to the suspension and stirred, where Na 2 SiO 3 The volume ratio of the solution to the suspension is 1:20, and then slowly add 1.8mol / L HCl solution to adjust the pH to 6.5; the mixture is aged at 60°C for 2.5 hours, and then washed with deionized water to neutrality. Fe 3 O 4 @SiO 2 Nanoparticles;

[0032] (2) The Fe synthesized in step (1) 3 O 4 @SiO 2 Put 1.4g of nanoparticles into a 1.4mol / L 100ml HCl solution and let stand for 11h, then wash with pure water to neutrality, and then rinse with ethanol to remove the washed 1.3g Fe 3 O 4 @ SiO 2 Disperse into 100ml ethanol to obtain a suspension, disperse the suspension ul...

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 and application of a modified superparamagnetic Fe3O4 nanoparticle, belonging to the field of treatment of industrial wastewater. The method comprises the following steps of preparing the superparamagnetic Fe3O4 nanoparticle by adopting a coprecipitation method; by taking superparamagnetic Fe3O4 as a core, coating the surface of Fe3O4 with one or more layers of silica shells by adopting hydrolysis; modifying coated silica by applying a coupled reaction principle; by taking iminodiacetic acid as a modification reagent, modifying by adopting a nucleophilic reaction to obtain the modified superparamagnetic Fe3O4 nanoparticle; then using the superparamagnetic Fe3O4 nanoparticle to adsorb heavy metal chromium, and in particular to selectively adsorb Cr<6+> at normal temperature. The modified superparamagnetic Fe3O4 nanoparticle has the advantage of high adsorption efficiency.

Description

Technical field [0001] The invention relates to a modified superparamagnetic Fe 3 O 4 The preparation method and application of nano particles belong to the field of industrial wastewater treatment. Background technique [0002] Many industrial wastewaters contain large amounts of chromium. The presence of these chromium compounds will not only cause environmental pollution and threaten human health, but also cause a large amount of chromium metal loss. Since there are many forms of chromium in chromium-containing wastewater, it is difficult to remove it by general methods. At present, electrolysis is the main method for removing chromium in industry. Its principle is mainly to use iron plate as anode electrolysis to generate ferrous ions to reduce hexavalent chromium ions to trivalent chromium ions, so that trivalent chromium ions are precipitated as hydroxides. However, the disadvantage of this process is that the iron plate consumes more, and the sludge is mixed with a large ...

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): B01J20/30B01J20/22B01J20/28C02F1/28C02F101/22
CPCB01J20/06B01J20/103B01J20/22B01J20/28007B01J20/28009B01J20/28016B01J2220/42B01J2220/44B01J2220/4806B01J2220/4812C02F1/281C02F2101/22
Inventor 汤立红金旭李凯孙鑫宁平包双友郭惠斌朱婷婷张秀英
Owner KUNMING UNIV OF SCI & TECH