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Preparation method and application of modified superparamagnetic Fe3O4 nanoparticle

A nanoparticle and superparamagnetic technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of low utilization value and high consumption of iron plates, and achieve low production cost , Low requirements for preparation conditions and large specific surface area

Active Publication Date: 2016-06-22
KUNMING UNIV OF SCI & TECH
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  • 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

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: This modified superparamagnetic Fe 3 o 4 The preparation method of nanoparticle NFCC is as follows:

[0015] (1) Add 0.57g nano Fe 3 o 4 Disperse in 100mL deionized water, after ultrasonic dispersion for 30min, in N 2 Under protection, heat to 80°C while stirring to obtain a suspension, add 1mol / L Na 2 SiO 3 The solution was added dropwise to the suspension and stirred, wherein, Na 2 SiO 3 The volume ratio of the solution to the suspension is 1:3, then slowly add 1.5mol / L HCl solution to adjust the pH value to 5.5; age the mixture at 80°C for 2 hours, and then wash it with deionized water until neutral to obtain Fe 3 o 4 SiO 2 Nanoparticles;

[0016] (2) Fe synthesized in step (1) 3 o 4 SiO 2 Put 1.2g of nanoparticles into 1mol / L100mL HCl solution and let it stand for 8h, then wash with pure water until neutral, then rinse with ethanol, wash the 1.1gFe 3 o 4 SiO 2 Disperse in 100mL of ethanol to obtain a suspension, ultrasonically disperse...

Embodiment 2

[0022] Embodiment 2: This modified superparamagnetic Fe 3 o 4 The preparation method of nanoparticle NFCC is as follows:

[0023] (1) Add 0.6g nanometer Fe3 o 4 Disperse in 100mL of deionized water, after ultrasonic dispersion for 40min, in N 2 Under protection, heat to 75°C while stirring to obtain a suspension, add 1.2mol / L Na 2 SiO 3 The solution was added dropwise to the suspension and stirred, wherein, 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 value to 6.0; age the mixture at 75°C for 2.3 hours, and then wash it with deionized water until neutral to obtain Fe 3 o 4 SiO 2 Nanoparticles;

[0024] (2) Fe synthesized in step (1) 3 o 4 SiO 2 Put 1.3g of nanoparticles into 1.2mol / L100mL HCl solution and let stand for 10h, then wash with pure water until neutral, then rinse with ethanol, wash 1.2gFe 3 o 4 SiO 2 Disperse in 100mL of ethanol to obtain a suspension, ultrasonically di...

Embodiment 3

[0030] Embodiment 3: This 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°C while stirring to obtain a suspension, add 1.3mol / L Na 2 SiO 3 The solution was added dropwise to the suspension and stirred, wherein, Na 2 SiO 3 The volume ratio of the solution to the suspension is 1:20, then slowly add 1.8mol / L HCl solution to adjust the pH value to 6.5; age the mixture at 60°C for 2.5 hours, and then wash it with deionized water to neutrality to obtain Fe 3 o 4 SiO 2 Nanoparticles;

[0032] (2) Fe synthesized in step (1) 3 o 4 SiO 2 Put 1.4g of nanoparticles into 1.4mol / L100ml HCl solution and let it stand for 11h, then wash with pure water until neutral, then rinse with ethanol, wash the 1.3gFe 3 o 4 SiO 2 Disperse in 100ml of ethanol to obtain a suspension, ultrasonic...

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PUM

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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 waste water treatment. Background technique [0002] There is a large amount of chromium in many industrial wastewaters. The existence of these chromium compounds will not only cause environmental pollution, but also pose a threat to human health, and cause a large amount of chromium metal loss. Because there are many forms of chromium in chromium-containing wastewater, it is difficult to remove it by general methods. At present, the electrolysis method is the main means of removing chromium in industry. Its principle is mainly to use an iron plate as an anode to electrolyze to generate ferrous ions to reduce hexavalent chromium ions to trivalent chromium ions, so that the trivalent chromium ions are precipitated as hydroxides. However, the disadvantage of this process is that the consumption of ir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/22B01J20/28C02F1/28C02F101/22
CPCB01J20/06B01J20/103B01J20/22C02F1/281B01J20/28007B01J20/28009B01J20/28016C02F2101/22B01J2220/4812B01J2220/44B01J2220/42B01J2220/4806
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
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