Core-shell magnetic nano material as well as preparation method and application thereof
A nano-magnetic material, core-shell type technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems that cannot be reused, cannot be quickly recycled, etc.
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[0024] The present invention first proposes a preparation method of a core-shell nano-magnetic material, comprising the following steps:
[0025] S1, to obtain nano zero-valent iron;
[0026] S2, place the nano-zero valent iron in water at 5-40°C (water at room temperature) to make a suspension, add potassium permanganate solution, carry out ultrasonic reaction, and then magnetically separate the magnetically selected solid The core-shell nano-magnetic material is the iron-manganese oxide-coated nano-zero-valent iron.
[0027] Wherein, step S1 can be adopted: under mechanical stirring and anaerobic conditions (such as nitrogen protection), at room temperature, according to FeCl 3 and NaBH 4 The molar ratio of FeCl is 1:3 to 40. 3 Solution added to NaBH 4 The reaction is carried out in the solution for 1-30 minutes, and after the reaction, the solid is magnetically sucked out, and the magnetically sucked solid is washed to obtain the nano-zero valent iron, which is a black ...
Embodiment 1
[0038] At a temperature of 25°C, 0.2318g FeCl was 3 Dissolve in 143mL ultrapure water, and add 1.5112g NaBH 4 Dissolve in 100mL ultrapure water; under the condition of mechanical stirring and nitrogen protection, FeCl 3 The solution was added to NaBH at a rate of 9 mL / min 4 After 10 minutes of reaction, the solid was collected by magnetic separation, washed three times with ultrapure water and ethanol each, and finally stored in ethanol; the particle size of the obtained NZVI was about 100 nm, denoted as NZVI100.
[0039] 40mg (0.714mmol) of NZVI100 was placed in ultrapure water and sonicated uniformly to form a 0.5g / L suspension, adding potassium permanganate solution containing 0.357mmol Mn, sonicated for 10 minutes, separated by magnetic separation after sonication, and collected the solid , freeze-drying to obtain iron-manganese oxide-coated nano-zero-valent iron material. In the obtained iron-manganese oxide, the valence state of iron is +3, and the valence state of ma...
Embodiment 2
[0041] At a temperature of 25°C, 0.2318g FeCl was 3 Dissolve in 143mL of 20% ethanol solution, and add 1.5112g NaBH 4 Dissolved in 100 mL of 20% ethanol solution; under mechanical stirring and nitrogen protection, the FeCl 3 The solution was added to NaBH at a rate of 9 mL / min 4 After 10 minutes of reaction, the solid was collected by magnetic separation, washed three times with ultrapure water and ethanol each, and finally stored in ethanol; the particle size of the obtained NZVI was about 50 nm, denoted as NZVI50.
[0042] 40mg (0.714mmol) of NZVI50 was placed in ultrapure water and evenly ultrasonicated to form a 0.5g / L suspension, a potassium permanganate solution containing 0.357mmol Mn was added, ultrasonicated for 10 minutes, and the solid was separated by magnetic separation after ultrasonication. , freeze-drying to obtain iron-manganese oxide-coated nano-zero-valent iron material. In the obtained iron-manganese oxide, the valence state of iron is +3, and the valenc...
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