Preparation of g-C3N4/rGO/ZnS photocatalyst and application in photoelectrochemical cathodic protection
A photocatalyst, g-c3n4 technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of easy recombination of photogenerated electrons and holes, low conductivity, etc., and achieve photogenerated electrons Effects of increased migratory capacity, reduced economic loss, clear social and economic benefits
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Embodiment 1
[0033] Preparation of lamellae g-C 3 N 4 : Take 10g melamine and 1g polyacrylamide (polymerization degree 3 million) and dissolve in 2L water, stir magnetically for 5-8h to form a uniform solution. The above solution was centrifuged to collect the precipitate, and dried under vacuum at 60°C. Put the collected white precipitate into the tube furnace N 2 Under atmosphere, heat up to 550°C at a rate of 2°C / min-2.5°C / min and burn for 3 hours. The obtained product was ground and dispersed in deionized water at a concentration of 1 mg / ml, ultrasonicated for 8 hours, and the supernatant was taken, filtered and dried to obtain a brown powder g-C 3 N 4 Material.
[0034] Preparation of graphene oxide sol: Add 3g of graphite powder, 3g of phosphorus pentoxide, and 3g of potassium persulfate into a 500ml three-necked flask, then add 50ml of concentrated sulfuric acid to the mixed powder, and stir at 80°C for 5h. After cooling to room temperature, it was slowly diluted with 300ml of...
Embodiment 2
[0036] With the graphene oxide sol in Example 1, prepare rGO / ZnS composite material: get respectively 0g, 0.97g, 2.91g, 4.85g graphene oxide sol (0.5wt%) and 4 parts of 0.1756g zinc acetate, be dissolved in 40ml In water, sonicate for 30 minutes until the dispersion is uniform, recorded as A. Then take 0.240g of sodium sulfide and dissolve it in 20ml of water, record it as B. Add B dropwise to A, and the mixture was stirred under a magnetic stirrer for 30 min, then put into the reaction kettle at 180°C for 12 h, and the obtained black precipitate was washed with deionized water and ethanol and dried to obtain 0%-rGO / ZnS, 5%-rGO / ZnS, 15%-rGO / ZnS and 25%-rGO / ZnS.
[0037] With g-C among the embodiment 1 3 N 4 Material and the rGO / ZnS composite material prepared in this embodiment, prepare g-C 3 N 4 / rGO / ZnS ternary composite photocatalyst: take 0.1g g-C 3 N 4 and 0.1 g of rGO / ZnS with different mass fractions (0%, 5%, 15%, 25%) were put into a solution with a volume rati...
Embodiment 3
[0056] Referring to the method of Example 1 and Example 2, prepare 15%-rGO / g-C 3 N 4 / ZnS composite material;
[0057] The preparation method of the photoelectrode is as follows: the fluorine-doped conductive glass is cut into small pieces of 10 mm × 20 mm, and the mixed solution of deionized water: isopropanol: acetone with a volume ratio of 1: 1: 1 is ultrasonically treated for 30 min. Ultrasonic treatment in deionized water for 30 min, and finally rinsed with deionized water. Take the dried conductive glass and seal the conductive surface with tape, leaving only a working area of 10mm×10mm. Mix 20mg carbon nitride, 20μL polyethylene glycol, and 1mL ethanol in a centrifuge tube, sonicate for about 30 minutes to make a slurry, then use a pipette to suck up 20μL and drop it on the working area of the fluorine-doped conductive glass surface as evenly as possible. , to ensure that the sample quality on the surface of the fluorine-doped conductive glass is the same, and af...
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