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A kind of sodium citrate magnetic nano particle forward osmosis drawing solution and preparation method thereof

A technology of magnetic nanoparticles and sodium citrate, which is applied in the environmental field, can solve few problems and achieve the effects of convenient operation, good economic and social benefits, and good stability

Active Publication Date: 2018-11-20
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, bovine serum albumin, dextran coating, PEG-(COOH) 2 coating, 2-pyrrolidone, triethylene glycol, polyacrylic acid, sodium hydroxide and calcium hydroxide and other substances to modify magnetic nanoparticles, but the use of sodium citrate to modify magnetic nanoparticles and further making sodium citrate magnetic There are few reports on nanoparticle forward osmosis draw solution

Method used

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  • A kind of sodium citrate magnetic nano particle forward osmosis drawing solution and preparation method thereof
  • A kind of sodium citrate magnetic nano particle forward osmosis drawing solution and preparation method thereof
  • A kind of sodium citrate magnetic nano particle forward osmosis drawing solution and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: Preparation of ferroferromagnetic nanoparticles

[0025] Ferric chloride (FeCl 3 ·6H 2 O) and ferrous chloride (FeCl 2 4H 2 O) With the ratio of substances of 1:2, after being dissolved in distilled water of the same volume respectively, dropwise in the sodium hydroxide solution with a dropping funnel, under the protection of nitrogen, set the stirring speed as 320rpm, and continuously stir for 30min until completely mixed; then heated to 80°C, continued to stir for 3 hours, and naturally cooled to room temperature to obtain a black gel-like precipitate; finally, the black gel-like precipitate was centrifuged at a speed of 5000-7000rpm for 10- After 15 minutes, the top liquid was separated from the separation tube, and the obtained precipitate was washed to neutrality with ultrapure water, and dried at -18°C for 16 hours to obtain ferroferric oxide magnetic nanoparticles. The TEM image is as follows figure 1 As shown, the infrared analysis diagram is s...

Embodiment 2

[0027] Example 2: Preparation of Sodium Citrate Magnetic Nanoparticles Forward Osmosis Drawing Solution

[0028] Sodium citrate solution was added to the ferroferric oxide magnetic nanoparticles prepared, heated to 95° C. and vigorously stirred for 1 hour to obtain a black gel-like suspension; Centrifuge for 10-15min under the same conditions, remove the supernatant, wash the obtained precipitate with ultrapure water and centrifuge again, repeat 2-3 times; finally dry the washed precipitate at -20°C for 14 hours to obtain lemon Sodium Oxide Magnetic Nanoparticles. The obtained sodium citrate magnetic nanoparticles were dispersed in distilled water, and then sonicated for 20-30 min to obtain the sodium citrate magnetic nanoparticles forward osmosis draw solution.

[0029] The TEM figure of the obtained sodium citrate magnetic nanoparticles is as follows figure 2 shown by figure 2 It can be seen that the agglomeration phenomenon of ferroferric oxide magnetic nanoparticles m...

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Abstract

The invention belongs to the technical filed of environments and discloses a sodium citrate magnetic nanoparticle forward osmosis draw solution and a preparation method thereof. The method comprises the following steps of: performing coprecipitation on molysite in an alkaline solution so as to prepare ferroferric oxide magnetic nanoparticles; then adding sodium citrate, and preparing sodium citrate magnetic nanoparticles under conditions of heating and stirring intensely; and finally, dispersing sodium citrate magnetic nanoparticles into distilled water, and performing ultrasound dissolution promotion, thereby preparing the sodium citrate magnetic nanoparticle forward osmosis draw solution. The obtained sodium citrate magnetic nanoparticle forward osmosis draw solution is high in osmotic pressure, easy in separation from water and regeneration, and recyclable, has favorable economical and social benefits in the aspect of forward osmotic treatment of strong brine or seawater; the preparation method is simple in technical route and convenient to operate; the used raw materials can be purchased in the market and are free from pretreatment.

Description

technical field [0001] The invention belongs to the field of environmental technology, and in particular relates to a preparation method of a sodium citrate magnetic nano particle forward osmosis drawing solution. Background technique [0002] Forward osmosis technology, early SO 2 The solution is used as the drawing solution, which is regenerated by heating, but the energy consumption is high; later, glucose and sodium chloride solution are used as the drawing solution, but the cost of regeneration or concentration is still high, and the reverse osmosis amount of sodium chloride is relatively high. McCutcheon et al. NH 3 / CO 2 (i.e. NH 4 HCO 3 ) is used as a draw solution, which is regenerated by heating. The regeneration is easy and the energy consumption is low, so that the forward osmosis technology is gradually becoming practical, but there are still problems of high regeneration cost and high reverse osmosis volume, which makes the ammonia in the feed concentrate e...

Claims

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Application Information

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IPC IPC(8): B01D61/00
CPCB01D61/005
Inventor 马伟芳李轻轻严玉林
Owner BEIJING FORESTRY UNIVERSITY
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