Magnetic single-core double-shell type porous calcium silicate material and preparation method thereof

A porous calcium silicate and magnetic technology, which is applied in chemical instruments and methods, silicon compounds, and other chemical processes, can solve the problems of poor adsorption capacity of heavy metals, achieve the effects of reducing agglomeration, particle integrity, and increasing compatibility

Active Publication Date: 2018-05-18
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnetic ferroferric oxide is a magnetic material that is easy to prepare, low in cost, and widely used, but it has poor adsorption capacity for heavy metals.

Method used

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  • Magnetic single-core double-shell type porous calcium silicate material and preparation method thereof
  • Magnetic single-core double-shell type porous calcium silicate material and preparation method thereof
  • Magnetic single-core double-shell type porous calcium silicate material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Mix 22.89g of anhydrous sodium acetate with 137mL of ethylene glycol, add 5.3mL of acetaldehyde, and dissolve with ultrasonic-assisted mechanical stirring, then add 7.63g of polyethylene glycol 4000 and 6.54g of polyvinylpyrrolidone PVP K17, After dissolving with ultrasonic-assisted mechanical stirring, place it in constant temperature water at 45°C for later use to obtain solution A; weigh 25.14g of ferric chloride hexahydrate and add it to 151mL of ethylene glycol, and dissolve with ultrasonic-assisted mechanical stirring to obtain solution B; B was slowly added dropwise to solution A under vigorous stirring, continued to stir for 30 min after the addition, and then transferred to a 500 mL stainless steel reactor with a polytetrafluoroethylene liner, and reacted at 150 ° C for 5 h. After cooling to room temperature, use magnet adsorption to separate from the reaction solution, and then wash 5 times with deionized water and 3 times with absolute ethanol to obtain ma...

Embodiment 2

[0036] (1) Mix 22.89g of anhydrous sodium acetate with 172mL of ethylene glycol, add 5.0mL of acetaldehyde, and dissolve with ultrasonic-assisted mechanical stirring, then add 5.72g of polyethylene glycol 4000 and 5.09g of polyvinylpyrrolidone PVP K17, After dissolving with ultrasonic-assisted mechanical stirring, place it in constant temperature water at 50°C for later use to obtain solution A; weigh 21.55g of ferric chloride hexahydrate and add it to 120mL of ethylene glycol, and dissolve with ultrasonic-assisted mechanical stirring to obtain solution B; B was slowly added dropwise to solution A under vigorous stirring, continued to stir for 40 min after the addition, and then transferred to a 500 mL stainless steel reactor with a polytetrafluoroethylene liner, and reacted at 140 ° C for 8 h. After cooling to room temperature, use magnet adsorption to separate from the reaction solution, then wash with deionized water for 4 times and absolute ethanol for 2 times to obtain mag...

Embodiment 3

[0040] (1) Mix 22.89g of anhydrous sodium acetate with 114.5mL of ethylene glycol, add 5.1mL of acetaldehyde, and dissolve with ultrasonic-assisted mechanical stirring, then add 6.54g of polyethylene glycol 4000 and 4.58g of polyvinylpyrrolidone PVP K17 , ultrasonically assisted mechanical stirring and dissolving, and placed in constant temperature water at 40°C for later use to obtain solution A; weigh 30.16g of ferric chloride hexahydrate and add it to 151mL of ethylene glycol, and ultrasonically assisted mechanical stirring to dissolve to obtain solution B; then Solution B was slowly added dropwise to solution A under vigorous stirring, and continued to stir for 35 minutes after the addition, and then transferred to a 500 mL stainless steel reactor with a polytetrafluoroethylene liner, and reacted at 160 ° C for 4 hours. After cooling to room temperature, use magnet adsorption to separate from the reaction solution, and then wash 5 times with deionized water and 3 times with...

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Abstract

The invention relates to a magnetic single-core double-shell type porous calcium silicate material and a preparation method thereof. The method comprises the steps as follows: on the basis of acetaldehyde as a reducing agent, ethylene glycol as a solvent as well as polyethylene glycol and polyvinylpyrrolidone which are used cooperatively as a template agent and a dispersing agent, ferric salt is reduced with participation of acetate, ferroferric oxide microspheres are obtained and dispersed in ethanol-water, tetramethylammonium hydroxide is used as alkali to hydrolyze tetraethyl orthosilicate,silica is generated, the surface of ferroferric oxide microspheres is directly coated with silica, and Fe3O4@SiO2 microspheres are formed; the microspheres are directly dispersed in anhydrous ethanolwithout drying, silicate and calcium salt as raw materials are used for in-situ synthesis on the surface of the Fe3O4@SiO2 microspheres, a product directly wraps porous calcium silicate, and the particle surface is coated with unstable and excessively thick calcium silicate by ultrasonic dispersion and mechanical stirring, and a product is obtained. The obtained product has excellent adsorption performance on heavy metals, excellent separation performance and relatively stable use process.

Description

technical field [0001] The invention relates to the field of heavy metal wastewater treatment, in particular to a magnetic single-core double-shell porous calcium silicate material and a preparation method thereof. Background technique [0002] Because heavy metals are non-biodegradable, highly toxic, and easy to accumulate in the body to cause cumulative poisoning, water pollution caused by heavy metals has become a serious environmental problem. The most harmful heavy metals to the environment are Hg, Cd, Pb, Cr and metalloid As, commonly known as "five poisons". For example, Cd has high toxicity and carcinogenicity even at a very low concentration. For example, the "Itai-Itai disease" that shocked the world was caused by Cd. At present, a variety of treatment methods have been developed for heavy metal pollution, typically including traditional chemical precipitation, chelation flocculation, ferrite, ion exchange, membrane separation, flotation, electrochemical and adsor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/20C02F101/22
CPCB01J20/10C02F1/281C02F2101/20C02F2101/22
Inventor 刘立华刘金燕胡博强周智华唐安平薛建荣
Owner HUNAN UNIV OF SCI & TECH
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