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A kind of hollow microsphere and its preparation method and application

A technology of hollow microspheres and microspheres, which is applied in the direction of chemical instruments and methods, other chemical processes, silicon compounds, etc., can solve the problem of no thallium pollution of hollow microspheres, and avoid hazardous waste or secondary pollution. small, selective effect

Active Publication Date: 2022-06-17
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there has been no report on hollow microsphere adsorption technology that can remove thallium pollution, especially the adsorption material that can reduce thallium-containing wastewater to below 2 μg / L for deep thallium removal

Method used

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  • A kind of hollow microsphere and its preparation method and application
  • A kind of hollow microsphere and its preparation method and application
  • A kind of hollow microsphere and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A preparation method of hollow microspheres, comprising the following steps:

[0048] (1) Preparation of polystyrene microspheres: add 50-60 ml of absolute ethanol and 6-10 ml of water to the reaction vessel, stir evenly, and then add 50-60 g of styrene, 3-5 g of polyvinylpyrrolidone, 0.5-1.0 g of diethyl ether Azodiisobutyronitrile, stirring and reacting at 60-80°C for 10-14 h; centrifuging the reaction solution and decanting the supernatant; adding absolute ethanol to ultrasonically disperse, and then centrifuging again for 3 times to remove unreacted The monomer and dispersion stabilizer; vacuum drying at 50~70℃ for 7~9h to obtain white powdery polystyrene microspheres.

[0049] (2) Preparation of hollow porous silica microspheres: dissolving polystyrene microspheres in absolute ethanol to obtain a polystyrene microsphere emulsion with a mass percentage of 20-30%; adding 25ml of polystyrene into the reaction vessel Ethylene microsphere emulsion, 1.5g cetyl trimethyl...

Embodiment 2

[0058] Experiment of adsorption and removal of thallium-containing wastewater from an iron and steel smelter in Shaoguan, Guangdong (10mg / L of thallium in wastewater):

[0059] Take 50ml of thallium-containing wastewater into 4 beakers (pH=7.0), add hollow microspheres at 0.2g / L, 0.6g / L, 0.8g / L, 1g / L respectively, and then stir uniformly by pneumatic stirring and stop after 180min. , put it on the permanent magnet, and after it is completely settled, take the upper layer of clarified wastewater to detect the concentration of thallium, and calculate the removal rate of thallium. Take the supernatant liquid, and then add hollow microspheres at 0.6g / L, the final thallium removal rate is close to 100%, and the thallium concentration drops below 2μg / L.

Embodiment 3

[0061] Experiment of adsorption and removal of thallium-containing wastewater from an iron and steel smelter in Shaoguan, Guangdong (10mg / L of thallium in wastewater):

[0062] Take 50ml of thallium-containing wastewater into 4 beakers (pH=7.0), add hollow microspheres at a rate of 0.6g / L, stir evenly, react for 60, 120, 180, and 240 minutes, respectively, and then stop, and place them on a permanent magnet. Let it stand, after it is completely coagulated, take the upper layer of clarified wastewater to detect the concentration of thallium, and calculate the removal rate of thallium. .

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Abstract

The invention relates to the technical field of material preparation and sewage treatment, and discloses a method for preparing hollow microspheres: using styrene emulsion as a template to synthesize silica microspheres, and then using silica microspheres as a template to synthesize iron-manganese oxide-dioxide Silica microspheres, and finally remove the silica to obtain hollow microspheres. The hollow microspheres prepared by the invention have the function of adsorbing thallium, a highly toxic element in waste water, and the hollow microspheres adsorbing thallium naturally settle under the action of a magnet, and the thallium in the clarified liquid in the upper layer falls to meet the requirement of environmental protection. The hollow microspheres adsorbing thallium can be recycled, avoiding the generation of hazardous waste, and realizing the resource utilization of thallium. The hollow microspheres of the present invention can adsorb and settle thallium in wastewater with a pH of 2-10, are easy to prepare, have good selectivity, are less affected by other impurities, have strong and fast adsorption capacity, small usage, and low cost. After the treatment of thallium-containing wastewater, thallium can be reduced to below 2 μg / L, which meets the discharge standard for thallium pollutants in industrial wastewater (DB 44‑1989‑2017).

Description

technical field [0001] The invention relates to the technical field of material synthesis and wastewater treatment, in particular to a hollow microsphere and a preparation method and application thereof. Background technique [0002] In the environment, the distribution of thallium is sparse and scattered, and independent deposits are formed in very few areas. It is often associated with oxide minerals such as mica, feldspar, alunite, jarosite, galena, pyrite in the form of trace elements. Among the sulfide minerals such as sphalerite and sphalerite, the pyrite area is often associated with thallium metal resources, with large reserves, high grade and wide distribution, so a large amount of thallium-containing wastewater will be released in the process of iron and steel mining and smelting. In water, thallium mainly exists in the form of positive monovalent, and its properties are very similar to potassium. It is a scattered element with strong mobility and high toxicity. C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C01B33/12C01G49/00C01G49/02C01G45/00C01G45/02C02F1/28C02F101/20
CPCB01J20/103B01J20/28021C01B33/12C01G49/00C01G49/02C01G45/00C01G45/02C02F1/281C01P2004/61C01P2004/34C01P2004/03C02F2101/20
Inventor 黄颖陈迪云张庆解庆林陈永亨马建平李龙纪澄许家友黄晓丽
Owner GUILIN UNIVERSITY OF TECHNOLOGY