Super-hydrophobic hollow Fe3O4/mesoporous silicon dioxide nanocomposite, preparation method and application thereof
A technology of mesoporous silica and nanocomposite materials, applied in chemical instruments and methods, alkali metal compounds, adsorbed water/sewage treatment, etc., can solve the problems of hindering large-scale application of materials, poor circulation effect, increased energy consumption, etc. problems, to achieve the effect of improving oil absorption effect, saving reagents, and improving oil absorption efficiency
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[0028] A superhydrophobic hollow Fe of the present invention 3 O 4 / Mesoporous silica nanocomposite material preparation method, the specific preparation process is as figure 1 , Including the following steps:
[0029] The first step: Hollow Fe 3 O 4 Nanospheres are dissolved in isopropanol solution to form Fe with a mass concentration of 3.3 mg / mL 3 O 4 Solution, ultrasonically dispersed at 25~35℃ for 10~20min to obtain Fe 3 O 4 The precursor solution was transferred to a three-necked flask, where the hollow Fe 3 O 4 The particle size of the nano-microspheres is 220~260nm, and the isopropanol solution is composed of deionized water and isopropanol in a volume ratio of 1:(2~4);
[0030] The second step, take 30~50mLFe 3 O 4 Precursor solution, add 2.6~3mLNH 3 .H 2 O, stirring at room temperature for 10-20 minutes, then slowly adding 0.9-1.1mLTEOS in portions to continue stirring the reaction, the reaction time is 5-7h;
[0031] In the third step, the product obtained in the second ste...
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[0033] Example 1
[0034] In the first step, the hollow Fe 3 O 4 Nanospheres are dissolved in isopropanol solution to form Fe with a mass concentration of 3.3 mg / mL 3 O 4 Solution, ultrasonic 10min at 25℃, form Fe 3 O 4 The precursor solution was transferred into a three-necked flask, in which the hollow Fe 3 O 4 The particle size of the nanospheres is 220nm, and the isopropanol solution is composed of 10mL of water and 20mL of isopropanol;
[0035] The second step, to 30mL, the Fe obtained in the first step 3 O 4 Add 2.6mL NH to the precursor solution 3 .H 2 O, stirring at room temperature for 10 minutes, and then slowly adding 0.9mLTEOS at room temperature to continue stirring the reaction, the reaction time is 5h;
[0036] In the third step, the product obtained in the second step was washed several times with absolute ethanol and deionized water, and re-dispersed in 80 mL of deionized water, and then 0.8 g PVPK15 was added, and the mixture was stirred at 90° C. The reaction time w...
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[0038] Example 2
[0039] In the first step, the hollow Fe 3 O 4 Nanospheres are dissolved in isopropanol solution to form Fe with a mass concentration of 3.3 mg / mL 3 O 4 Solution, ultrasonic 15min at 30℃, form Fe 3 O 4 The precursor solution was transferred into a three-necked flask, in which the hollow Fe 3 O 4 The particle size of the nanospheres is 240nm, and the isopropanol solution is composed of 10mL of water and 30mL of isopropanol;
[0040] The second step, to 40mL, the Fe obtained in the first step 3 O 4 Add 2.8mL NH to the precursor solution 3 .H 2 O, stirring at room temperature for 15 minutes, and then slowly adding 1.0mLTEOS at room temperature to continue stirring the reaction, the reaction time is 6h;
[0041] In the third step, the product obtained in the second step was washed several times with absolute ethanol and deionized water, and re-dispersed in 80 mL of deionized water, and then 0.9 g of PVPK15 was added to raise the temperature of the water bath to 95°C for ...
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