Method for preparing ultrathin two-dimensional doped carbon nitride nanosheets through supercritical stripping and application of ultrathin two-dimensional doped carbon nitride nanosheets to efficient photocatalytic decomposition of water
A carbon nitride and nanosheet technology, applied in the field of green photocatalysis, can solve the problems of cumbersome processing steps, unfriendly environment, unfavorable large-scale application, etc., and achieve the effect of improving photocatalytic activity
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Embodiment 1
[0017] Embodiment 1: Low pressure (8MPa) supercritical stripping, doping, photocatalysis
[0018] Preparation of carbon nitride: adopt the traditional thermal polymerization method, take 5.0g melamine, grind it thoroughly, place it in a crucible with a cover, raise the temperature to 600°C at a rate of 5°C / min in a tube furnace, and keep it for 120min. After annealing, the pale yellow product lumps of carbon nitride were collected.
[0019] Stripping of carbon nitride: take 0.2g of carbon nitride, place it in a 50ml small high-pressure closed reaction kettle and ensure the airtightness of the device. Put the compressed carbon dioxide into the reaction kettle for air exhaust operation. Afterwards, set the rotating speed of 1200rad / s, and continue to feed carbon dioxide into the reactor to 8Mpa, and at this time, carbon dioxide reaches a supercritical state. During the whole process, it can be seen that the carbon nitride powder gradually fills the reactor, and as the pressure...
Embodiment 2
[0022] Embodiment 2: High pressure (30MPa) supercritical stripping, doping, photocatalysis
[0023] Preparation of carbon nitride: adopt the traditional thermal polymerization method, take 5.0g melamine, grind it thoroughly, place it in a crucible with a cover, raise the temperature to 600°C at a rate of 5°C / min in a tube furnace, and keep it for 120min. After annealing, the pale yellow product lumps of carbon nitride were collected.
[0024] Stripping of carbon nitride: batch and high-pressure stripping operations are realized in medium-sized closed reactors. Take 0.2g of carbon nitride and place it in an airtight reaction vessel and ensure the airtightness of the device. Feed compressed carbon dioxide into the reactor for air discharge operation, and then continue to feed carbon dioxide into the reactor to 30Mpa, at which time the carbon dioxide reaches a supercritical state. After 48 hours of supercritical stripping, open the exhaust valve, slowly release the compressed c...
Embodiment 3
[0027] Example 3: Phosphated carbon nitride, supercritical exfoliation, doping, photocatalysis
[0028] Preparation of carbon phosphide and nitride: adopt traditional thermal polymerization method, mix 2.5g melamine and 2.5g urea, grind them thoroughly, put them in a crucible with a cover, and raise the temperature in a tube furnace at a rate of 5°C / min Keep at 600°C for 120min, after annealing, collect the light yellow product block carbon nitride;
[0029] Put carbon nitride and sodium hypophosphite with a mass ratio of 5:1 in a mortar, physically mix evenly, drop in absolute ethanol to infiltrate the mixture, and then grind thoroughly. After the mixture is dry, place it in a crucible with a lid. In a tube furnace, the temperature was raised to 400° C. at a rate of 5° C. / min, and kept for 120 minutes. After annealing, the dark yellow product was collected to obtain phosphated carbon nitride.
[0030] Stripping of carbon phosphide and nitride: batch and high-pressure strippi...
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