SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2021, Vol. 33 ›› Issue (5): 181-189.DOI: 10.1016/j.cjche.2020.09.045

• Catalysis, Kinetics and Reaction Engineering • 上一篇    下一篇

Evaluations of physico-chemical properties of TiO2/clinoptilolite synthesized via three methods on photocatalytic degradation of crystal violet

Raza Ullah, Jihong Sun, Anadil Gul, Tallat Munir, Xia Wu   

  1. Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, Beijing University of Technology, Beijing 100124, China
  • 收稿日期:2020-03-13 修回日期:2020-08-11 出版日期:2021-05-28 发布日期:2021-08-19
  • 通讯作者: Jihong Sun, Xia Wu
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (21878006).

Evaluations of physico-chemical properties of TiO2/clinoptilolite synthesized via three methods on photocatalytic degradation of crystal violet

Raza Ullah, Jihong Sun, Anadil Gul, Tallat Munir, Xia Wu   

  1. Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, Beijing University of Technology, Beijing 100124, China
  • Received:2020-03-13 Revised:2020-08-11 Online:2021-05-28 Published:2021-08-19
  • Contact: Jihong Sun, Xia Wu
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (21878006).

摘要: Different preparation routes for TiO2-supported natural and synthetic clinoptilolite (TiO2/CP) composites were thoroughly investigated on the basis of sol-gel, hydrothermal, and in-situ hydrothermal methods. The micro-structural features and physicochemical properties of resultant TiO2/CPs were characterized via X-ray diffraction patterns, scanning (transmission) electron microscope images, Fourier transform infrared spectra, inductively coupled plasma-optical emission spectrometry methods, BET-isotherms, UV-visible spectra, and surface charge potential distributions. The results showed that in-situ hydrothermal method led to well dispersions of loaded-TiO2 particles on the surface of leaf-like CP, while obviously aggregated TiO2 on a relatively distorted structure of CP was obtained using sol-gel and hydrothermal methods. Their adsorptive and photocatalytic efficiencies for removal of crystal violet (CV) dye in aqueous solution were also explored under UV-irradiations. The results demonstrated that TiO2/CPs synthesized via sol-gel and in-situ hydrothermal methods presented the excellent performances with 98% removal efficiencies as compare to the bare commercial TiO2 which achieved 53% removal of CV dye. While, the in-situ hydrothermally synthesized TiO2/CPs were the best due to their moderate energy cost, highest adsorption capacities and removal efficiencies. Particularly, the synthetic CPs as supports exhibited synergetic photocatalytic activities for the degradation of CV dye, which is attributed to their high surface areas, better adsorption capability, and fine dispersion of TiO2 particles. Adsorption and degradation kinetics of CV dye were found to follow the pseudo-second and pseudo-first order models, respectively.

关键词: Adsorption, Synthesis, Zeolite, Degradation, TiO2, Crystal violet

Abstract: Different preparation routes for TiO2-supported natural and synthetic clinoptilolite (TiO2/CP) composites were thoroughly investigated on the basis of sol-gel, hydrothermal, and in-situ hydrothermal methods. The micro-structural features and physicochemical properties of resultant TiO2/CPs were characterized via X-ray diffraction patterns, scanning (transmission) electron microscope images, Fourier transform infrared spectra, inductively coupled plasma-optical emission spectrometry methods, BET-isotherms, UV-visible spectra, and surface charge potential distributions. The results showed that in-situ hydrothermal method led to well dispersions of loaded-TiO2 particles on the surface of leaf-like CP, while obviously aggregated TiO2 on a relatively distorted structure of CP was obtained using sol-gel and hydrothermal methods. Their adsorptive and photocatalytic efficiencies for removal of crystal violet (CV) dye in aqueous solution were also explored under UV-irradiations. The results demonstrated that TiO2/CPs synthesized via sol-gel and in-situ hydrothermal methods presented the excellent performances with 98% removal efficiencies as compare to the bare commercial TiO2 which achieved 53% removal of CV dye. While, the in-situ hydrothermally synthesized TiO2/CPs were the best due to their moderate energy cost, highest adsorption capacities and removal efficiencies. Particularly, the synthetic CPs as supports exhibited synergetic photocatalytic activities for the degradation of CV dye, which is attributed to their high surface areas, better adsorption capability, and fine dispersion of TiO2 particles. Adsorption and degradation kinetics of CV dye were found to follow the pseudo-second and pseudo-first order models, respectively.

Key words: Adsorption, Synthesis, Zeolite, Degradation, TiO2, Crystal violet