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Volume 41 Issue 2
Feb.  2023
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2023  >  41(2): 146-155
SUN Yueyin, HUANG Qiong, ZHOU Jie, YU Xiaomeng, ZHU Jie, GU Mingyang, XU Lirui, YANG Bo, TAO Tao. PREPARATION OF VISIBLE LIGHT CATALYST AND PERFORMANCE ANALYSIS OF FORMALDEHYDE DEGRADATION OVER SILVER-BISMUTH MODIFIED TiO2 NANOMATERIAL[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(2): 146-155. doi: 10.13205/j.hjgc.202302020
Citation: SUN Yueyin, HUANG Qiong, ZHOU Jie, YU Xiaomeng, ZHU Jie, GU Mingyang, XU Lirui, YANG Bo, TAO Tao. PREPARATION OF VISIBLE LIGHT CATALYST AND PERFORMANCE ANALYSIS OF FORMALDEHYDE DEGRADATION OVER SILVER-BISMUTH MODIFIED TiO2 NANOMATERIAL[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(2): 146-155. doi: 10.13205/j.hjgc.202302020
shu

PREPARATION OF VISIBLE LIGHT CATALYST AND PERFORMANCE ANALYSIS OF FORMALDEHYDE DEGRADATION OVER SILVER-BISMUTH MODIFIED TiO2 NANOMATERIAL

doi: 10.13205/j.hjgc.202302020

  • 1. Jiangsu Key Laboratory of Atmospheric Environmental Monitoring & Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technologies, School of Environmental Science & Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China;

  • 2. School of Chemistry and Materials Science, Nanjing University of Information Science & Technology, Nanjing 210044, China

  • Received Date: 2022-05-11
    Available Online: 2023-05-25
  • Publish Date: 2023-02-01
    Abstract
  • The prevention and control of indoor low-concentration gaseous formaldehyde are still one of the great challenges faced by indoor environmental pollution. It is of great practical significance to design and synthesize catalysts with strong adsorption capacity, high catalytic oxidation performance and good stability. In this study, a series of Ag-Bi co-doped and nano-structured Ag/Bi-TiO2 photocatalysts were synthesized by the hydrothermal method and sol-gel method, which were applied for catalytic degradation of formaldehyde under visible light and non-dynamic conditions. The catalysts were characterized by XRD, SEM, BET, H2-TPR, UV-vis and XPS, and the effects of the preparation method, Ag-Bi incorporation amount and calcination temperatures on catalytic oxidation were investigated. The results showed that the Ag/Bi-TiO2-H catalyst prepared by the hydrothermal method exhibited the best degradation effect of formaldehyde, which degradation rate reached 94.1% in 48 hours, and formaldehyde concentration reduced from 1.076 mg/m3 to 0.093 mg/m3, significantly improving the catalytic performance of TiO2. The Ag2O/Ag, Bi3+ and TiO2 catalyst could be improved by coupling action between the microstructure, enhancing the absorption of visible light, to promote the formation of photoproduction electronics and their transferring. The surface hydroxyl and the adsorbed oxygen formed by coupling enhanced the adsorption and catalytic oxidation degradation of HCHO with low concentration. The possible principles of the catalysts were described, and the catalyst also showed excellent stability.
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