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. 2021 Dec 31;14(1):164.
doi: 10.3390/polym14010164.

Porous Ceramics Adsorbents Based on Glass Fiber-Reinforced Plastics for NOx and SOx Removal

Hiroyuki Kinoshita  1 , Kentaro Yasui  2 , Taichi Hamasuna  3 , Toshifumi Yuji  4 , Naoaki Misawa  5 , Tomohiro Haraguchi  1 , Koya Sasaki  6 , Narong Mungkung  7
Affiliations

Porous Ceramics Adsorbents Based on Glass Fiber-Reinforced Plastics for NOx and SOx Removal

Hiroyuki Kinoshita et al. Polymers (Basel). .

Abstract

To reuse waste glass fiber-reinforced plastics (GFRPs), porous ceramics (i.e., GFRP/clay ceramics) were produced by mixing crushed GFRP with clay followed by firing the resulting mixture under different conditions. The possibility of using ceramics fired under a reducing atmosphere as adsorbent materials to remove NOx and SOx from combustion gases of fossil fuels was investigated because of the high porosity, specific surface area, and contents of glass fibers and plastic carbides of the ceramics. NO2 and SO2 adsorption tests were conducted on several types of GFRP/clay ceramic samples, and the gas concentration reduction rates were compared to those of a clay ceramic and a volcanic pumice with high NO2 adsorption. In addition, to clarify the primary factor affecting gas adsorption, adsorption tests were conducted on the glass fibers in the GFRP and GFRP carbides. The reductively fired GFRP/clay ceramics exhibited high adsorption performance for both NO2 and SO2. The primary factor affecting the NO2 adsorption of the ceramics was the plastic carbide content in the clay structure, while that affecting the SO2 adsorption of the ceramics was the glass fiber content.

Keywords: NO2 adsorption performance; SO2 adsorption performance; adsorbent; ceramics; reuse; waste GFRP.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The manufacturing process of GFRP/clay ceramic samples.
Figure 2
Figure 2
Microscope images of the granular GFRP/clay ceramic specimens.
Figure 3
Figure 3
Pore size distributions in the samples.
Figure 4
Figure 4
SEM images of the surface structures of clay and GFRP/clay ceramic samples.
Figure 5
Figure 5
A schematic diagram of the NO2 or SO2 adsorption test.
Figure 6
Figure 6
NO2 reduction rates for the samples.
Figure 7
Figure 7
SO2 concentration reduction rates for the samples.
Figure 8
Figure 8
The reduction rates of NO2 concentration on the glass fiber and GFRP carbides.
Figure 9
Figure 9
The reduction rates of SO2 concentration on the glass fiber and the carbide of GFRP.
Figure 10
Figure 10
Elemental analysis results of glass fibers before and after SO2 adsorption tests. (a) Spectral profile before SO2 adsorption test, (b) Spectral profile after SO2 adsorption test, (c) An image of sulfur elemental mapping by EDS, (d) SEM image of mapping region.
See this image and copyright information in PMC

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