A carbon nanotube and graphite flake hybrid material and its preparation method and application
A hybrid material and carbon nanotube technology, which is applied in the field of water treatment, can solve the problems of limited catalytic performance and difficult modification of original graphite sheets/carbon nanotubes, and achieve excellent activation effect, strong anti-interference ability and high catalytic activity. Effect
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Embodiment 1
[0050] Example 1 Preparation of catalyst and performance test
[0051] (1) Preparation of catalyst
[0052] Catalyst 1 to 5: Weighing the mass of 10 g of ferric cyanide, placed under a nitrogen atmosphere, raised to 800 ° C under a nitrogen atmosphere, and thermally thermally insulated from 1H, 3H, 5H, respectively. 7H, 9H ° C, then washed, vacuum drying, and catalyst 1, 2, 3, 4, 5, respectively.
[0053] Catalyst 6 to 8: The catalyst 3 was washed at different times, weighed 100 mg of catalyst 3, and stirred in a 1 m sulfuric acid solution, stirred for 12 h, 24h, 36 h, then washed to neutral, centrifuge, 60 ° C drying, respectively Catalysts 6, 7, 8.
[0054] Catalysts 9 to 11: The catalyst 6-8 is annealed twice separately. A 100 mg catalyst 6-8 was weighed, and the temperature increase rate of 5 ° C / min in the tube furnace was raised to 700 ° C under a nitrogen atmosphere and was held for 1 h. After cooling to room temperature, the catalysts 9, 10, 11 were obtained.
[0055] (2...
Embodiment 2
[0060] Example 2 Detailed degradation experiments were performed in a TC model contaminant with a catalyst 10 as an optimal catalyst.
[0061] Catalytic activity was evaluated in a 150 ml reactor containing a concentration of catalyst, PMS and contaminated, and stirred at a water bath at 25 ° C. 10 mg of catalyst (catalyst 10, commercial nitrogen doped carbon nanotubes, commercial multilayer graphite, and mixed nitrogen doped carbon nanotubes) were added to 50 ml of TC (50 mg / l) solution for 20 minutes, The balance of adsorption-desorption is reached until it is reached. 10 mg of PMS was added to the above solution to initiate a reaction. Specific methods, see the performance test portion of Example 1, all experiments are carried out under pH = 7. Such as Figure 5 As shown, it can be seen that the degradation capability of a separate PMS is almost ignored, only 3.0%, indicating that the PMS is an oxidant, but its oxidation capacity is limited; the separate catalyst 10 has only a...
Embodiment 3
[0062] Example 3 Catalytic degradation mechanism before and after pickling
[0063] In order to confirm the active substances and degradation mechanisms generated during the PMS activation process, a series of free radical quas was carried out in the catalyst 10 and the catalyst 3. Methanol (MeOH), tert-butanol (TBA), and L-Histidine are used as the free radical cleavage agent, respectively, for hydroxy free radicals (· OH) and sulfate (SO4 · -) , Free radical (SO4 · -), single-line oxygen ( 1 O 2 Clear, the result is like Image 6 Indicated. The catalyst 10 / PMS system exhibits high tolerance to MeOH and TBA, indicating that · OH and SO4 · - not the primary active substance. Interestingly, the inhibition of the TBA on the degradation process is stronger than MeOH, which should be attributed to the hydrophobic interaction of the catalyst 10 and TBA. However, when the system is added at 1.55 g / L L-histidine, the degradation efficiency of the catalyst 10 is significantly reduced, ...
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