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Fangxu Wan1, Changhua Wang, Yonghua Han

  • 1Center for Advanced Optoelectronic Functional Materials Research, and Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China. wangch100@nenu.edu.cn xtzhang@nenu.edu.cn.

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Summary
This summary is machine-generated.

This study develops a novel silica aerogel monolith coated with titanium dioxide (TiO2) for efficient air pollutant removal. The composite material retains high adsorption capacity and allows complete UV light penetration for effective photocatalytic oxidation.

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nanotechnology

Background:

  • Adsorbent-photocatalyst composites are promising for air purification.
  • Challenges include reduced adsorption and light blocking in conventional composite fabrication.
  • A monolithic structure is needed to overcome these limitations.

Purpose of the Study:

  • To develop a novel adsorbent-photocatalyst monolith composite with retained adsorption capacity and full light penetration.
  • To investigate the efficiency of this composite for gaseous pollutant removal.
  • To optimize titanium dioxide (TiO2) loading for maximum performance.

Main Methods:

  • Fabrication of a SiO2 aerogel monolith as the adsorbent support.
  • Atomic layer deposition (ALD) of TiO2 onto the SiO2 aerogel skeleton.
  • Characterization of the composite's adsorption and photocatalytic oxidation capabilities for acetaldehyde and NO.
  • Measurement of light transmittance through the monolith.

Main Results:

  • The SiO2-TiO2 monolith composite demonstrated high adsorption capacity for acetaldehyde (54% in 10 min at 200 ppm).
  • Low TiO2 loading (0.6 wt%) achieved optimal performance.
  • High light transmittance (6% at 387 nm) confirmed complete UV light penetration.
  • Complete mineralization of acetaldehyde to CO2 was achieved via photocatalytic oxidation under UV irradiation.

Conclusions:

  • The developed adsorbent-photocatalyst monolith composite effectively removes gaseous pollutants.
  • The monolithic structure preserves adsorption capacity and enables efficient photocatalysis.
  • This novel 3D model offers a promising approach for advanced air purification technologies.