SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2022, Vol. 46 ›› Issue (6): 142-149.DOI: 10.1016/j.cjche.2021.05.037

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Hydrothermal preparation of Nb-doped NaTaO3 with enhanced photocatalytic activity for removal of organic dye

Hao Zhou, Qi Yin   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
  • 收稿日期:2021-01-04 修回日期:2021-04-30 出版日期:2022-06-28 发布日期:2022-07-20
  • 通讯作者: Hao Zhou,E-mail:zhouhao@zju.edu.cn
  • 基金资助:
    This work was supported by the Innovative Research Groups of the National Natural Science Foundation of China (51621005).

Hydrothermal preparation of Nb-doped NaTaO3 with enhanced photocatalytic activity for removal of organic dye

Hao Zhou, Qi Yin   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
  • Received:2021-01-04 Revised:2021-04-30 Online:2022-06-28 Published:2022-07-20
  • Contact: Hao Zhou,E-mail:zhouhao@zju.edu.cn
  • Supported by:
    This work was supported by the Innovative Research Groups of the National Natural Science Foundation of China (51621005).

摘要: The construction of efficient photocatalysts has received much attention in wastewater treatment. In this study, Nb-doped NaTaO3 was prepared with different doping ratio by a facile hydrothermal method. The prepared catalysts were analyzed by X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller (BET) theory, ultraviolet–visible diffuse reflectance spectroscopy. Then the synthesized catalysts were employed to degrade a model pollutant, methylene blue (MB), under a 250 W mercury lamp. The characterization tests confirm that Nb was successfully doped into the crystal structure of NaTaO3 and the modified NaNbxTa1-xO3 (x is the doping ratio; x = 0.25, 0.5, 0.75) samples were formed, which were in regular cubic shapes just like pure NaTaO3. The synthesized NaNbxTa1-xO3 (x = 0.25, 0.5, 0.75) had improved specific surface area and narrowed band gaps compared with pure NaTaO3. In photocatalytic degradation experiments, NaNb0.75Ta0.25O3 presented the best photocatalytic activity ascribed to the narrow band gap and the high surface area, degradating 95.7% of MB after 180 min of reaction, which was even twice the ability of pure NaTaO3. Besides, the effects of possible inorganic anions and cations in wastewater on photocatalytic degradation were investigated. Electron spin resonance (ESR) tests and capture experiments were also conducted and a possible photocatalytic mechanism was proposed. This work provides a direction for constructing superior NaTaO3-based photocatalysts to be widely utilized in environmental protection.

关键词: Photocatalytic degradation, Methylene blue, NaTaO3

Abstract: The construction of efficient photocatalysts has received much attention in wastewater treatment. In this study, Nb-doped NaTaO3 was prepared with different doping ratio by a facile hydrothermal method. The prepared catalysts were analyzed by X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller (BET) theory, ultraviolet–visible diffuse reflectance spectroscopy. Then the synthesized catalysts were employed to degrade a model pollutant, methylene blue (MB), under a 250 W mercury lamp. The characterization tests confirm that Nb was successfully doped into the crystal structure of NaTaO3 and the modified NaNbxTa1-xO3 (x is the doping ratio; x = 0.25, 0.5, 0.75) samples were formed, which were in regular cubic shapes just like pure NaTaO3. The synthesized NaNbxTa1-xO3 (x = 0.25, 0.5, 0.75) had improved specific surface area and narrowed band gaps compared with pure NaTaO3. In photocatalytic degradation experiments, NaNb0.75Ta0.25O3 presented the best photocatalytic activity ascribed to the narrow band gap and the high surface area, degradating 95.7% of MB after 180 min of reaction, which was even twice the ability of pure NaTaO3. Besides, the effects of possible inorganic anions and cations in wastewater on photocatalytic degradation were investigated. Electron spin resonance (ESR) tests and capture experiments were also conducted and a possible photocatalytic mechanism was proposed. This work provides a direction for constructing superior NaTaO3-based photocatalysts to be widely utilized in environmental protection.

Key words: Photocatalytic degradation, Methylene blue, NaTaO3