Three-dimensional macroporous carbon anchored monatomic iron catalyst as well as preparation method and application thereof
A technology of three-dimensional macropores and iron catalysts, applied in chemical instruments and methods, physical/chemical process catalysts, applications, etc., can solve the problems of large energy consumption, low removal efficiency, long removal time, etc., to improve utilization rate, remove High efficiency and high activity effect
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Embodiment 1
[0028] Example 1 Synthesis of catalytic material 3D Fe-NC
[0029] Dopamine (0.5g), Sodium Chloride (1g), FeCl 3 ·6H 2 O (20mg) was added to 100ml of water, and after 2 hours of conventional sonication, freeze-dried at -54°C for 5 days, and the obtained white powder was calcined in an argon atmosphere at a calcination temperature of 800°C and a heating rate of 3°C / min. The time was 2 h; the calcined black powder was washed with water and 0.5M sulfuric acid solution to remove the template sodium chloride, and then dried in an oven at 70 °C for one night, which was 3D Fe-NC, and the iron loading was 17.wt% , called 1.7% 3DFe-NC.
[0030] 3D Fe-NC SEM microstructure such as figure 1 The high-angle annular dark field-scanning transmission electron microscope image shown in figure 2 shown; by figure 1 It can be seen that the 3D Fe-NC is a three-dimensional macroporous shape with a pore diameter of about 1 μm; figure 2 A uniform distribution of iron atoms can be seen.
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Embodiment 2
[0036] Example 2 Catalyst material 3D Fe-NC for the removal of chloramphenicol in soil
[0037] (a) Take 1 g of soil with an initial pollutant concentration of 100 mg / kg of chloramphenicol and put it into a quartz tube. At this time, pH=7.60 and water content is 15%;
[0038] (b) Add 30 mg of catalyst material (Example 1) or a comparative catalyst material, and then microwave catalysis for 5 minutes at a power of 1200 W;
[0039] (c) Add 5 ml of methanol to the microwave-catalyzed soil for ultrasonic leaching for 30 min and then centrifuge. The resulting clear night was put into a liquid phase vial, and the concentration of chloramphenicol was determined by HPLC.
[0040] The removal results of different catalysts for the initial pollution concentration of 100 mg / kg soil are as follows: Figure 4 , AC is commercially available activated carbon, and MW is microwave; it can be seen that the catalyst of the present invention achieves the best removal rate of 1.7% 3D Fe-NC, and r...
Embodiment 3
[0042] Example 3 Removal of different pollutants
[0043] (a) Take 10 g of soil with an initial contaminant concentration of 100 mg / kg and put it into a quartz tube and stir it on a mixer; the initial contaminants are 2,4-dichlorophenol, di-n-propyl phthalate ester, phenanthrene or benzaldehyde;
[0044] (b) 300 mg of the above catalyst material 1.7% 3D Fe-NC was added, and microwave catalyzed at 1200 W for 5 min;
[0045] (c) Add 50 ml of methanol to the soil after microwave catalysis for ultrasonic leaching for 30 min and then centrifuge. The obtained clear night was put into a liquid phase vial, and the concentration of each pollutant was determined by HPLC; the removal results of different pollutants are shown in Figure 5 , it can be seen that the catalyst of the present invention 1.7% 3D Fe-NC to benzaldehyde also reaches 99.9% removal rate within 5min.
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