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A large particle size recyclable heavy metal adsorption functional microsphere and its application

A technology with large particle size and heavy metals, applied in the directions of alkali metal compounds, adsorbed water/sewage treatment, alkali metal oxides/hydroxides, etc. Set performance, avoid water impact, not easy to corrode effect

Active Publication Date: 2019-05-14
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the in-situ repair technology based on in-situ solidification / stabilization or in-situ coverage has a certain effect on the treatment of heavy metals, heavy metals cannot be degraded. Due to changes in physical and chemical conditions, pollutants are easily re-released and continue to pollute the ecological environment.
Although sediment dredging can remove pollutants, there are risks such as residual pollutants and leakage of polluted sediments leading to pollution diffusion. In addition, a large amount of hazardous waste that needs to be treated on land is generated. Generally speaking, the project volume is large and the cost is very high. high
[0005] The existing heavy metal adsorption function is mainly nano-scale functional microspheres, which cannot be recycled in sediment and soil. Although heavy metals in water sediments and soil can be enriched in situ, pollutants are easy to change due to changes in external physical and chemical conditions. released, there is a possibility of recontamination

Method used

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  • A large particle size recyclable heavy metal adsorption functional microsphere and its application
  • A large particle size recyclable heavy metal adsorption functional microsphere and its application
  • A large particle size recyclable heavy metal adsorption functional microsphere and its application

Examples

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preparation example Construction

[0035] The preparation method of the recyclable heavy metal adsorption functional microspheres with large particle size comprises the following steps:

[0036] 1) preparing ferroferrofluid;

[0037] 2) In ferric oxide (Fe 3 o 4 ) under the condition that magnetic fluid exists, take methyl methacrylate (MMA) as monomer, carry out dispersion polymerization reaction, obtain Fe 3 o 4 @PMMA magnetic microspheres;

[0038] 3) Fe 3 o 4 @PMMA magnetic microspheres modify ethylenediamine to obtain Fe 3 o 4 @PMMA@EDA microspheres;

[0039] 4) Fe 3 o 4 @PMMA@EDA microspheres modify polyglutamic acid to obtain Fe 3 o 4 @PMMA@EDA@r-PGA functional microspheres.

[0040] Preferably, in step 1), the ferroferric oxide ferrofluid is prepared by co-precipitation method of ferrous iron salt and ferric iron salt.

[0041] Preferably, in step 2), the polymethyl methacrylate microspheres are in the presence of ferroferrofluid, with methyl methacrylate as a monomer and benzoyl peroxide ...

Embodiment 1

[0050] Embodiment 1: Synthesis of functional microspheres

[0051] ① Fe 3 o 4 Preparation of @PMMA microspheres:

[0052] 1) Preparation of ferrofluid

[0053] Fe was prepared by chemical co-precipitation 3 o 4 Ferrofluid, namely Fe 2+ and Fe 3+ solution as n(Fe 2+ ):n(Fe 3+ )=1:1.65 ratio, under the condition of over-alkaline, stirred and reacted at 70°C for one hour to carry out the precipitation reaction, after cleaning the above-mentioned particles, the surfactant oleic acid was coated to improve the dispersibility of the particles.

[0054] 2) Preparation of magnetic microspheres

[0055] Using low-speed stirring suspension polymerization, 10ml of 0.058g / ml Fe coated with homemade oleic acid 3 o 4 Magnetic fluid was added to 25ml MMA dispersion polymerization system, polyvinyl alcohol (PVA 1788) and basic magnesium carbonate were used as stabilizer and auxiliary dispersant, benzoyl peroxide (BPO) was used as initiator, and methyl dimethacrylate was used as cros...

example 2

[0061] Example 2: Application of functional microspheres

[0062] ①Simulation experiment of in situ remediation of heavy metals in water combined with magnetic separation

[0063] Add 20 mg of the functional microspheres prepared above into 25 ml of 200 mg / L lead solution, put them into a 250 ml wide-mouth bottle, stir and mix them evenly, seal the sample and place it in a constant temperature shaker (25 ° C), simulate During the in-situ repair process, the shaking table was adsorbed for 12 hours (150rpm). The rare earth strong magnet is used to realize 100% recovery of the functional microspheres, and the concentration of the adsorbed water sample is measured by means of atomic absorption, and the amount of Pb adsorption and removal is calculated.

[0064] ②Recycling of functional microspheres

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Abstract

The invention discloses a large-particle-size recyclable heavy metal adsorbing type functional microsphere and application thereof. The functional microsphere is formed by sequentially modifying ethylenediamine and polyglutamic acid on the surface of a magnetic microsphere. The invention also discloses a preparation method of the large-particle-size recyclable heavy metal adsorbing type functional microsphere and application of the large-particle-size recyclable heavy metal adsorbing type functional microsphere in heavy metal adsorbing. A novel polyglutamic acid covalent bond-modified large-particle-size macromolecular microsphere is designed and prepared, and has the advantages that the water-resistant and common acid and alkaline corrosion-resistant properties are realized, the high-efficiency adsorbing and enriching property on heavy metal cations is realized, the functions of selective recycling and classifying from a water body, soil and bottom sludge can be realized by a magnetic field, and the regenerating and recycling functions are realized.

Description

technical field [0001] The invention relates to a large-diameter recyclable heavy metal adsorption function microsphere and its application. Background technique [0002] In the process of rapid industrial development in my country, a large amount of wastewater containing heavy metals enters water bodies and soils, and most of the heavy metal pollutants entering water bodies enter the solid phase of sediments from the water phase, resulting in the deposition of water bodies, soils (cultivated land, etc.) and rivers, lakes and reservoirs in my country. Heavy metal pollution of food is widespread and serious. For example, Beijiang is an important source of domestic water, production and breeding, and agricultural irrigation in Guangdong Province. Due to the historical mining development of Dabaoshan, the accumulation of heavy metals in the cultivated land and river sections of northern Guangdong is very serious. [0003] At present, there are mainly the following ways to remed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/28C02F1/28B01J20/30C02F101/20
CPCB01J20/06B01J20/22B01J20/261B01J20/262B01J20/28009C02F1/281C02F1/285C02F2101/20
Inventor 邓达义罗可颂陈妍希区建祥廖梓聪冯嘉键欧陶莎周乔
Owner SOUTH CHINA NORMAL UNIVERSITY
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