钡镧共掺杂对TaON降解亚甲基蓝染料的影响

doi:10.19964/j.issn.1006-4990.2023-0103

Abstract

Abstract:

Ba-La co-doped TaON photocatalysts were prepared by an improved solvothermal-high temperature nitridation method.The crystal structure，micromorphology and optical properties were analyzed by XRD，SEM，XPS，and the photocatalytic performance was evaluated by degradation of methylene blue（MB） solution.The results showed that Ba and La co-doping did not change the crystalline structure of TaON，but both of them replaced part of Ta⁵⁺ in the TaON lattice with ions，which resulted in slight changes in the morphology of TaON.The co-doped TaON had a smaller grain size and a narrower band gap，which further improved the light absorption ability and photogenerated carrier separation efficiency.The degradation efficiency of the co-doped TaON for MB under visible light was dramatically improved，and the best TaON photocatalytic performance was achieved when n（Ba）/n（La） was 1.00，with the degradation rate of MB reaching 86.5% in 120 min，which was about 25% higher than that of pure TaON，and the reaction was conformed to the first-order kinetic law.In addition，h⁺ and ·OH were the main active radicals in the degradation process of MB solution，and it still had good stability and catalytic performance after four cycles of catalysis.

Key words: Ba-La co-doped, TaON, photocatalysis, methylene blue, degradation rate

CLC Number:

TQ426

HUANG Jianan, LU Xiaoyu, WANG Mitang. Effect of Ba-La co-doping on degradation of methylene blue dye by TaON[J]. Inorganic Chemicals Industry, 2024, 56(2): 146-151.

Figures/Tables 8

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Effect of Ba-La co-doping on degradation of methylene blue dye by TaON

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