Synthesis And Photocatalytic Performance Of Tantalates Nanomaterial

Human society is facing energy and environmental problems.Photocatalytic materials can effectively use solar energy.Such as,hydrogen can be produced by cracking water.Photocatalyst can also be used in environmental management,degrading organic pollutants in water effectively.The environmental Pollution-free technology,promising to solve future energy problems and environmental pollution problems.So far,the perovskite type photocatalyst has great application prospect in the field of photocatalysis.In this paper,NaTaO₃ nanocatalyst was prepared by molten salt method.The effects of heat treatment temperature,heating rate,holding time and doping of Nb on the phase,morphology and properties of NaTa O3 were investigated.The effects of Sr doping and NiO semiconductor recombination on the phase,morphology,catalytic performance and electrochemical effects were investigated.The results show that the heat treatment temperature is 750 ℃,the heating rate is 5 ℃/min and the holding time is 2 h.Under this preparation condition,the NaTaO₃ 20-50 nm cube microstructure can be obtained.NaTaO₃ has a high photocatalytic activity,the highest hydrogen production rate of 0.57 mmol/h/g.The NaNbxTa1-xO3 was synthesized by NaTaO₃ B site doped withNb⁵⁺.The SrxNa1-2xNb_0.5Ta_0.5O₃ was synthesized by NaNb_0.5Ta_0.5O₃ A site doped with Sr²⁺.NiO/NaNb_0.5Ta_0.5O₃ was synthesized by NaNb_0.5Ta_0.5O₃ and NiO semiconductor recombined.The photocatalytic activity of hydrogen production and the photocatalytic degradation of pollutants and electrochemical properties show that the Nb element enters the crystal structure,and the optimized Nb⁵⁺ doping amount is 0.5.The hydrogen production of NaNb_0.5Ta_0.5O₃ within 6 h is 14.59 mmol/g.The hydrogen production efficiencywas 3.8 times that of NaTaO₃.The degradation ofrhodamine B up to 96% after 40 min irradiation.The rhodamine B was completely degraded after 50 min.The Sr²⁺ doping amount was 3%,and the hydrogen production of SrxNa1-2xNb_0.5Ta_0.5O₃ was 18.56 mmol/g and the hydrogen production rate was 3.09 mmol/h/g.The absorption of NiO/NaNb_0.5Ta_0.5O₃ was red shifted because of the the loading NiO.The photoreaction range of the photocatalyst was broadened.The hydrogen content of the optimized NiO was 3%.The hydrogen production of NiO/NaNb_0.5Ta_0.5O₃ was 26.70 mmol/g within 6 h.The hydrogen production rate was 4.45 mmol/h/g.The hydrogen production of the sample is 1.83 times of that of NaNb_0.5Ta_0.5O₃.