Preparation method of nano magnetic adsorbent with selective adsorption function on Pb (II)
A nano-magnetic, adsorbent technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of non-selective materials, difficult to recycle, low adsorption capacity, etc., to avoid secondary pollution , easy to operate, simple preparation method
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Embodiment 1
[0048]FECL3· 6h2O 2.7G and FECL2· 4h2O 0.994 g of 60 ml of deionized water, under nitrogen conditions, stir up to 80 ° C at a rate of 800 r / min, stirred, and then dissolved, adding ammonia water to regulate the solution pH 9, after 30min, add 0.8 g of citric acid, heating To 90 ° C, it continued for 90 min. After the reaction, the product was cooled to room temperature, magnetic separated, remove the upper liquid, washed with ethanol and deionized water, repeated 4 times; the resulting product was 60 ° C, vacuum drying for 6 h, ie gave Fe3O4Magnetic nanoparticles, finally grinding.
[0049]Will get the result3O4The magnetic nanoparticles were 0.1 g, in a mixed solvent of 25 ml of deionized water and 75 ml of ethanol, and after ultrasonic dispersion, nitrogen gas, connected to the condensation reflux, add 3- (isobutanoyloxide). Three trimethoxysilane 3 mL, reflux reaction for 6 hours. After the reaction, centrifugation was separated, and the upper liquid was removed, washed with deion...
Embodiment 2
[0052]FECL3· 6h2O 2.7G and FECL2· 4h2O 1.0 g was added to 50 ml of deionized water, under nitrogen conditions, stir up to 85 ° C at a rate of 800 r / min, and then stirred and dissolved, adding ammonia water to regulate the solution pH 9, after 30 min, add 0.8 g of citric acid, The temperature was warmed to 90 ° C and continued to react 90 min. After the reaction, the product was cooled to room temperature, magnetic separated, remove the upper liquid, washed with ethanol and deionized water, repeated 4 times; the resulting product was 60 ° C, vacuum drying for 6 h, ie gave Fe3O4Magnetic nanoparticles, finally grinding.
[0053]Will get the result3O4The magnetic nanoparticles were 0.5 g, which was placed in a mixed solvent of 30 ml of deionized water and 70 ml of methanol. After ultrasonic dispersion, nitrogen gas, connected to the condensation reflux, add 10 ml of anketoxysilane in an oil bath at 90 ° C. , Reflow reaction for 12 hours. After the reaction, centrifugation was separated, ...
Embodiment 3
[0056]FECL3· 6h2O 2.7G and FECL2· 4h2O 0.994 g of 60 ml of deionized water was added, under nitrogen conditions, stirring at a rate of 800r / min to 80 ° C, then stirred and dissolved, then the ammonia water regulated solution pH was 9, and after 30 min, 1.2 g of citric acid was added. The temperature was raised to 95 ° C and continued to react 90 min. After the reaction, the product was cooled to room temperature, magnetic separated, remove the upper liquid, washed with ethanol and deionized water, repeated 4 times; the resulting product was 60 ° C, vacuum drying for 6 h, ie gave Fe3O4Magnetic nanoparticles, finally grinding.
[0057]Will get the result3O4The magnetic nanoparticles were 0.3 g of 100 ml of ethanol solvent, and after ultrasonic dispersion, nitrogen gas was transferred, and the condensation refluxing device was attached, 6.5 ml of a vinyl trimethoxysilane was added dropwise, and refluxed for 9 hours in an oil bath at 75 ° C. After the reaction, centrifugation was separat...
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