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A kind of magnetic core-shell type porous calcium silicate material and preparation method thereof

A porous calcium silicate, core-shell technology, applied in chemical instruments and methods, silicon compounds, other chemical processes, etc., can solve the problems of low efficiency, cumbersome operation process, discontinuous process, etc., to reduce processes and simplify separation. Exercise, reduce the effect of reunion

Active Publication Date: 2020-11-06
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separation after the adsorption of heavy metals usually adopts filtration or centrifugation, the operation process is relatively cumbersome, the process is discontinuous, and the efficiency is low

Method used

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  • A kind of magnetic core-shell type porous calcium silicate material and preparation method thereof
  • A kind of magnetic core-shell type porous calcium silicate material and preparation method thereof
  • A kind of magnetic core-shell type porous calcium silicate material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (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

[0032] (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

[0035] (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 core-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, and ferroferric oxide microspheres with uniform particle size and complete particles are obtained; obtained spherical ferroferric oxide is directly dispersed in anhydrous ethanol, silicate and calcium salt as raw materials are used for in-situ synthesis on the surface of the ferroferric oxide particles, and a product directly wraps porous calcium silicate; finally, the particle surface is coated with unstable and excessively thick calcium silicate by ultrasonic dispersion and mechanical stirring, a core-shell porous calcium silicate material (Fe3O4@CaSiO3) coated with calcium silicate uniformly and stably is obtained. The problems that separation is relatively complicated and continuous operation cannot be performed after porous calcium silicate adsorbs heavy metalsare solved, continuous operation of adsorption and separation can be realized, and industrial application and popularization are facilitated.

Description

technical field [0001] The invention relates to the field of heavy metal wastewater treatment, in particular to a magnetic core-shell porous calcium silicate material and a preparation method thereof. Background technique [0002] Many industries, such as textiles, mining, smelting, paint, electroplating, lead industry, fertilizers, machining and battery manufacturing, generate large amounts of wastewater containing various heavy metals, such as mercury, cadmium, chromium, lead, arsenic, etc., which are Because trace amounts can produce significant toxic effects, are non-biodegradable, accumulate to the human body through the food chain to cause cumulative poisoning, and have long-term and concealed characteristics, it has seriously endangered human health, damaged aquatic ecosystems, and reduced agricultural and fishery production. etc., causing huge economic losses and becoming a major problem restricting the international community and my country's economic and social devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/04B01J20/06B01J20/10B01J20/28009C02F1/281C02F2101/20
Inventor 刘立华刘金燕赵露唐安平薛建荣令玉林
Owner HUNAN UNIV OF SCI & TECH
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