Carbon nanotube and graphite flake hybrid material and preparation method and application thereof
A technology of carbon nanotubes and hybrid materials, which is applied in the field of water treatment, can solve the problems of difficult modification, the limitation of the catalytic performance of original graphite sheets/carbon nanotubes, etc., and achieve strong anti-interference ability, excellent activation effect, and high degradation efficiency Effect
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Embodiment 1
[0050] Embodiment 1 prepares catalyst and performance test
[0051] (1) Preparation of catalyst
[0052] Catalysts 1 to 5: Weigh 10g of potassium ferricyanide respectively, place them in a tube furnace under nitrogen atmosphere, raise the temperature to 800°C at a rate of 5°C / min, and keep them warm for 1h, 3h, and 5h respectively. 7h, 9h°C, and then washed with water and dried in vacuum to prepare catalysts 1, 2, 3, 4, and 5, respectively.
[0053] Catalysts 6-8: acid-wash catalyst 3 at different times, weigh 100mg of catalyst 3, disperse in 1M sulfuric acid solution and stir for 12h, 24h, and 36h respectively, then wash until neutral, centrifuge, and vacuum-dry at 60°C to obtain Catalysts 6, 7, 8.
[0054] Catalysts 9 to 11: Catalysts 6 to 8 were respectively subjected to secondary annealing. Weigh 100mg of Catalysts 6-8 respectively, transfer to a tube furnace at a heating rate of 5°C / min to 700°C under a nitrogen atmosphere, and keep the temperature for 1h. After cooli...
Embodiment 2
[0060] Embodiment 2 uses catalyst 10 as the optimal catalyst to carry out detailed degradation experiments with TC model pollutants
[0061] Catalytic activity was evaluated in a 150-ml reactor containing certain concentrations of catalyst, PMS and contamination, and stirred in a water bath at 25 °C. 10mg of catalyst (Catalyst 10, commercial nitrogen-doped carbon nanotubes, commercial multilayer graphite and mixed nitrogen-doped carbon nanotubes & multilayer graphite) was added to 50ml of TC (50mg / L) solution for 20 minutes, until the adsorption-desorption equilibrium is reached. 10 mg of PMS was added to the above solution to initiate the reaction. For the specific method, see the performance test part of Example 1, and all experiments are carried out under the condition of PH=7. The result is as Figure 5 As shown, it can be seen that the degradability of independent PMS in 20min is almost negligible, only 3.0%, showing that although PMS is an oxidant, its oxidation capac...
Embodiment 3
[0062] Embodiment 3 studies the catalytic degradation mechanism before and after pickling
[0063] In order to confirm the active species produced by Catalyst 10 and Catalyst 3 during PMS activation and the degradation mechanism, a series of radical quenching experiments were performed. Methanol (MeOH), tert-butanol (TBA) and L-histidine (L-histidine) were used as free radical scavengers for hydroxyl radical ( OH) and sulfate radical (SO4 -) respectively , acid radical (SO4·-), singlet oxygen ( 1 o 2 ), the result is as follows Figure 6 shown. Catalyst 10 / PMS system showed high tolerance to MeOH and TBA, indicating that ·OH and SO4·- were not the main active species. Interestingly, TBA inhibited the degradation process more strongly than MeOH, which should be attributed to the hydrophobic interaction of catalyst 10 with TC and TBA. However, when 1.55g / L L-histidine was added to the system, the degradation efficiency of catalyst 10 was significantly reduced, indicating th...
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