Preparation method and application of porous magnetic superstructure nanocomposite
A nanocomposite material and superstructure technology, which is applied in the preparation and application of porous magnetic superstructure nanocomposite materials, can solve problems that have not yet been discovered, and achieve the effects of promoting electron transfer, mild reaction conditions, and good electrochemical activity
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Embodiment 1
[0040] Ni / Ni(OH) 2 Preparation of Porous Magnetic Composite Superstructures:
[0041] 0.713g nickel chloride hexahydrate (NiCl 2 ·6H 2 O) Dissolve in 30 mL of the mixed system formed by ethylene glycol (EG) and N,N-dimethylformamide (DMF) (EG / DMF=18 / 12), stir sufficiently with magnetic force to form a homogeneous solution, then add 0.038 g sodium borohydride (NaBH 4 ), and then magnetically stirred for 10 minutes; the mixed solution was transferred to the polytetrafluoroethylene liner of a 40 mL autoclave, and the stainless steel reaction kettle was tightly sealed, and heated to 170°C for 8 hours. After the reaction, when the temperature of the reactor was lowered to room temperature, the black product was collected with a magnet, and the product was centrifuged and washed several times with deionized water. Finally, it was dried under vacuum at 60° C. for 5 hours.
[0042] The product (Cu Kα ray, λ=0.154060 nm, scan speed 0.02 o / s) for phase identification, figure 1 I...
Embodiment 2
[0045] Under ultrasonic stirring, the Ni / Ni(OH) prepared in 20 mg embodiment 1 2 The porous composite superstructure is dispersed in 50ml of Pb with a concentration of 10mg / L 2+ 、Cu 2+ and Cd 2+ In the mixed solution of ions, after mechanical stirring for 30 minutes, the concentration of remaining ions was measured with an inductively coupled plasma (ICP) atomic emission spectrometer, and it was found that: Pb 2+ The ion concentration dropped from 10mg / L before adsorption to 4.84mg / L. At this time, 51.6% of Pb 2+ ions are removed. Adsorbent to Pb 2+ The adsorption capacity of ions is 12.9 mg / g (see Figure 6 ). Cu 2+ The ion concentration dropped from 10mg / L before adsorption to 4.25mg / L, 57.5%Cu 2+ ions are removed (see Figure 7 ), adsorbed Cu 2+ The ion capacity is 14.4mg / g. But in the same system Cd 2+ The measured concentration of ions did not change significantly (see Figure 8 ).
[0046] The above results show that the porous magnetic Ni / Ni(OH) 2 Select...
Embodiment 3
[0048] 10 mg of the product obtained in Example 1 was added to 50 milliliters of 10 mg / L of Cd 2+ , Pb 2+ and Cu 2+ In the mixed solution of ions, stirring and adsorbing for different time, using ICP atomic emission spectrometer to measure, the results show that the adsorbent has a good effect on Pb after adsorption for 50 minutes. 2+ 、Cu 2+ The adsorption reaches saturation, and its adsorption effect is ~65% and ~70% (such as Figure 9 ).
[0049] The adsorbent whose adsorption reaches saturation is separated from the waste water by applying an external magnetic field, and the separated adsorbent is put into 50ml of deionized water, and ultrasonically washed several times to remove the heavy metal ions adsorbed on the surface. Figure 10 Adsorb Pb for adsorbent reuse 3 times 2+ adsorption map. The results show that the adsorbent still has a good adsorption effect after repeated three times.
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