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CN-121988348-A - S-doped SrTiO3Photocatalyst, preparation method and application thereof

CN121988348ACN 121988348 ACN121988348 ACN 121988348ACN-121988348-A

Abstract

The invention relates to an S-doped SrTiO 3 photocatalyst, and a preparation method and application thereof, and belongs to the technical field of photocatalytic materials. In the experimental process, a molten salt medium is adopted to prepare SrTiO 3 by a high-temperature solid phase method, S ions are doped in a gradient manner by low-temperature calcination to obtain the S-doped SrTiO 3 photocatalyst, and a cocatalyst is loaded by an in-situ step-by-step photo-deposition method, so that the method can be applied to the field of photocatalytic total water splitting. Compared with the existing photocatalyst, the S-doped SrTiO 3 photocatalyst has strong stability, low-temperature doping inhibits volatilization of S, ensures that doped elements effectively enter a crystal lattice, avoids lattice distortion or generation of impurity phases at high temperature, reduces bulk phase defect aggregation, promotes uniformly distributed active sites, reduces surface dangling bonds by S doping, enhances chemical stability, and improves separation efficiency of carriers. The invention is green and environment-friendly, has simple method, convenient operation and low material preparation cost, accords with the environment-friendly concept advocated at present, and has wide application market prospect.

Inventors

  • TAO RAN
  • QI CHENGJIE
  • LI JUNHAO
  • Fei Wanting
  • CHU ZHENMING
  • FAN XIAOXING

Assignees

  • 辽宁大学

Dates

Publication Date
20260508
Application Date
20260123

Claims (10)

  1. 1. The S-doped SrTiO 3 photocatalyst is characterized in that the S-doped SrTiO 3 photocatalyst comprises, by mole percent, 0.8-1.2% of SrTiO 3 .
  2. 2. The method for preparing the S-doped SrTiO 3 photocatalyst as defined in claim 1, which is characterized by comprising the following steps: Step 1, putting SrTiO 3 and SrCl 2 ·6H 2 O into a mortar for mixing and grinding, transferring into a crucible, calcining in a muffle furnace, and carrying out suction filtration and drying to obtain SrTiO 3 nano particles; And 2, weighing SrTiO 3 nano particles and thiourea, grinding uniformly, calcining in a muffle furnace, cooling the calcined powder, adding water, stirring, performing suction filtration and drying to obtain the S-doped SrTiO 3 photocatalyst.
  3. 3. The preparation method according to claim 2, wherein in the step 1, the mass ratio of SrTiO 3 to SrCl 2 ·6H 2 O is 1:14.5.
  4. 4. The method according to claim 2, wherein in step 1, the calcination temperature is 1100 ℃ and the calcination time is 10 h.
  5. 5. The preparation method according to claim 2, wherein in the step 2, the S doping amount is 0.8-1.2% of SrTiO 3 by mole percent.
  6. 6. The method according to claim 2, wherein in step 1 and step 2, the drying temperature is 60 ℃ and the drying time is 12 h.
  7. 7. The method of claim 2, wherein in step 2, the milling time is 10 min.
  8. 8. The method according to claim 2, wherein in step 2, the calcination temperature is 500 ℃, the temperature rise rate is 5 ℃ per minute, and the calcination time is 3 h.
  9. 9. The use of the S-doped SrTiO 3 photocatalyst according to claim 1 for catalyzing the complete dissolution of water under irradiation of visible light.
  10. 10. The use according to claim 9, characterized in that the method comprises uniformly dispersing the S-doped SrTiO 3 photocatalyst according to claim 1 in a reaction tank filled with deionized water, adding the following in-situ photo-deposition promoter, adding 126 μl of Na 3 RhCl 6 ·12H 2 O aqueous solution with a concentration of 0.59 mg/mL, rh mass of 0.1% of SrTiO 3 , 300W xenon lamp illumination of 10 min, adding Cr (NO 3 )·9H 2 O aqueous solution with a concentration of 7.7 mg/mL, 10 μl of Cr mass of 0.05% of SrTiO 3 , 300W xenon lamp illumination of 5 min, adding 21 μl of CoCl 2 ·6H 2 O aqueous solution with a concentration of 10 mg/mL, co mass of 0.05% of SrTiO 3 , 300W xenon lamp illumination of 5 min, and finally adding 5 min in a container containing the mixed solution at 40 mL/min to obtain a relatively vacuum environment, decomposing hydrogen in water under the condition of visible light illumination.

Description

S-doped SrTiO 3 photocatalyst and preparation method and application thereof Technical Field The invention belongs to the technical field of photocatalytic materials, and particularly relates to a preparation method and application of an S-doped SrTiO 3 photocatalyst. Background In recent years, environmental problems such as global warming and renewable energy have attracted considerable attention worldwide. The global warming and the shortage of energy have increased, and the demand for renewable energy, which is environmentally friendly and economically viable, has increased. Photocatalysis is one of the key technologies for converting solar energy into high-density, storable chemical energy. Photocatalytic water splitting to produce hydrogen is one of the ideal ways to solve energy crisis and environmental pollution, and its core is to develop efficient and stable semiconductor photocatalysts, and perovskite oxide materials have attracted great attention in photocatalysis due to their unique crystal structures and are widely used as photocatalysts. SrTiO 3, a typical perovskite type oxide, is widely used in the field of photocatalytic water splitting due to its unique crystal structure, excellent chemical stability, ease of preparation, and good water splitting activity under uv light. However, the wide bandgap of SrTiO 3 (about 3.2 eV) results in a limited light absorption range and a high photo-generated carrier recombination rate, which makes it slightly less effective in decomposing water in practical applications. Therefore, doping SrTiO 3 is an effective method for improving solar energy utilization and photon-generated carrier separation efficiency. The S-doped SrTiO 3 photocatalyst provided by the invention has the advantages that the S-doped SrTiO 3 photocatalyst is used for inducing oxygen vacancies as an electron capture center, inhibiting photo-generated electron-hole recombination, reducing surface dangling bonds, enhancing chemical stability and stabilizing a cycle experiment. S volatilization is inhibited in the low-temperature doping process, doping elements are ensured to effectively enter a crystal lattice, doping lattice distortion or generation of impurity phases at high temperature is avoided, and the S-doped SrTiO 3 photocatalyst has not been reported in the whole water decomposition. Disclosure of Invention In order to solve the problems, the invention provides an S-doped SrTiO 3 photocatalyst, and a preparation method and application thereof. The technical scheme adopted by the invention is that the S-doped SrTiO 3 photocatalyst is characterized in that the S-doped SrTiO 3 photocatalyst comprises, by mole percent, 0.8-1.2% of SrTiO 3. The preparation method of the S-doped SrTiO 3 photocatalyst comprises the following steps: Step 1, putting SrTiO 3 and SrCl 2·6H2 O into a mortar for mixing and grinding, transferring into a crucible, calcining in a muffle furnace, and carrying out suction filtration and drying to obtain SrTiO 3 nano particles; And 2, weighing SrTiO 3 nano particles and thiourea, grinding uniformly, calcining in a muffle furnace, cooling the calcined powder, adding water, stirring, performing suction filtration and drying to obtain the S-doped SrTiO 3 photocatalyst. Further, in the above preparation method, in step 1, the mass ratio of SrTiO 3 to SrCl 2 ·6H2 O is 1:14.5. Further, in the above preparation method, in step1, the calcination temperature is 1100 ℃ and the calcination time is 10h. Further, in the preparation method, in the step 2, the S doping amount is 0.8-1.2% of SrTiO 3 by mole percent. Further, in the preparation method, in the step 1 and the step 2, the drying temperature is 60 ℃ and the drying time is 12 h. Further, in the above preparation method, in step 2, the grinding time is 10 min. Further, in the above preparation method, in step 2, the calcination temperature is 500 ℃, the heating rate is 5 ℃ per minute, and the calcination time is 3 h. The S-doped SrTiO 3 photocatalyst is applied to catalyzing full water dissolution under the irradiation of visible light. Further, the application method comprises uniformly dispersing the S-doped SrTiO 3 photocatalyst in a reaction tank filled with deionized water, adding the in-situ photo-deposition promoter, adding 126 μl of Na 3RhCl6·12H2 O aqueous solution with the concentration of 0.59 mg/mL, adding 0.1% of Rh mass of SrTiO 3, 300W xenon lamp illumination 10min, adding Cr with the concentration of 7.7 mg/mL (10 μl of NO 3)·9H2 O aqueous solution, 0.05% of Cr mass of SrTiO 3, 300W xenon lamp illumination 5min, adding 21 μl of CoCl 2·6H2 O aqueous solution with the concentration of 10 mg/mL, adding 0.05% of Co mass of SrTiO 3, 300W xenon lamp illumination 5min, finally, illuminating 5min, and decomposing water under the condition of visible light illumination by continuously introducing argon into a container with the mixed solution at 40 mL/min to obtain a relatively vacuum environment. The beneficial ef