A kind of preparation method of mil-53(fe)/g-c3n4 nanosheet composite photocatalytic material
A composite photocatalysis, g-c3n4 technology, applied in the field of photocatalytic materials, can solve the problems of easy composite, small specific surface area, etc., to achieve the effect of simple and easy process, mild conditions, suitable for large-scale production
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Embodiment 1
[0029] 1) g-C 3 N 4 Preparation of nanosheets
[0030] Weigh 10 g of urea and place it in a crucible with a lid, wrap the crucible with aluminum foil, place it in a box furnace for heating under a nitrogen atmosphere (introduce nitrogen at a flow rate of 1.5 L / min), and heat up to 550 °C at a heating rate of 5 °C / min. ~600℃, keep it warm for 2h, cool down to room temperature naturally, and get block g-C 3 N 4 ;Weigh 150mg of synthetic block g-C 3 N 4 , add 150mL of water, use an ultrasonic instrument with a power of 300W for 3 hours, then let it stand for 1 hour, use a dropper to carefully remove the top layer of liquid, and centrifuge at 7000 rpm for 10 minutes to obtain g-C 3 N 4 Nanosheet, its morphology and XRD spectrum see figure 2 .
Embodiment 2
[0032] 1) Preparation of MIL(Fe)-53
[0033] First, 2mmol FeCl 3 •6H 2 O and 2 mmol of terephthalic acid were dissolved in 40 mL of N,N-dimethylformamide, stirred magnetically for 60 min, then transferred to a hydrothermal kettle, heated at 150°C for 15 h, and cooled naturally to room temperature at 4000 rpm / min speed, centrifuged for 5min, then washed twice with DMF and methanol respectively, and finally vacuum-dried at 80°C for 12h to obtain the MIL(Fe)-53 (abbreviated as M53). For its morphology and XRD spectrum, see image 3 and Figure 7 .
[0034] 2) Photocatalysis experiment
[0035] Put 80 mg of the prepared M53 photocatalyst into potassium dichromate solution (100 mL) with a concentration of 50 ppm. Catalytic reaction. Get a certain amount of potassium dichromate solution at regular intervals, test the absorption spectrum of the solution with a UV-visible spectrophotometer, and calculate the degradation rate of the potassium dichromate solution by the change in ...
Embodiment 3
[0037] 1) MIL(Fe)-53 / g-C 3 N 4 Preparation of -20
[0038] First, weigh 20 mg of g-C synthesized in Example 1 3 N 4 Nanosheets were dispersed in 40mL of DMF at room temperature, ultrasonicated for 15-30 min, and then added with 2mmol FeCl 3 •6H 2 O and 2 mmol terephthalic acid, magnetically stirred for 60 min, transferred to a hydrothermal kettle, heated at 150°C for 15 h, naturally cooled to room temperature, centrifuged at 4000 rpm / min for 5 min, and then washed twice with DMF and methanol respectively. times, and finally vacuum dried at 80°C for 12h to obtain the MIL(Fe)-53 / g-C 3 N 4 -20 (referred to as M53 / g-C 3 N 4 -20) Composite photocatalytic material, its morphology and XRD spectrum refer to Figure 4 and Figure 7 .
[0039] 2) Photocatalysis experiment
[0040] The prepared M53 / g-C 3 N 4 Put 80mg of -20 composite photocatalytic material into potassium dichromate solution (100 mL) with a concentration of 50ppm. Under the condition of magnetic stirring, a...
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