研究目的
To investigate the effect of photocatalyzation on the degradation of trichloroethylene (TCE) in the aqueous phase by a photocatalyst-coated plastic optical fiber (POF) and to evaluate the feasibility of treating TCE by LED-coated fiber photocatalytic reaction systems.
研究成果
The photocatalytic efficiency of the photocatalyst-coated POF decreased with the increase in the number of coating times but increased with light intensity and treatment time. TiO2-coated POF was more effective in basic solutions, while ZnO-coated POF performed better in acidic conditions. The study concluded that a TiO2-coated POF with a 395 nm LED light source in a pH 10 solution is most effective for TCE degradation.
研究不足
The study focused on the aqueous phase treatment of TCE using a specific setup with TiO2 and ZnO photocatalysts. The limitations include the specific light intensity and wavelength used, the coating method's impact on photocatalyst thickness, and the solution's pH effect on photocatalytic efficiency.
1：Experimental Design and Method Selection:
The study utilized a photocatalytic optical fiber system with TiO2 and ZnO as photocatalysts, characterized by SEM and UV-Vis DRS. Two LEDs with low light intensity were used as the light source. The para-chlorobenzoic acid (pCBA) was used as the hydroxyl radical probe for kinetic study.
2：Sample Selection and Data Sources:
TCE concentration was set to 1 mg L?1, based on the consideration of the actual concentration of TCE in the contaminated groundwater.
3：List of Experimental Equipment and Materials:
Equipment included a photocatalytic reactor made by Pyrex glass, a light intensity meter (CHY 732), and analytical instruments like GC-ECD and HPLC. Materials included TiO2 (Degussa P-25) and ZnO (Aldrich) photocatalysts.
4：Experimental Procedures and Operational Workflow:
The POF was coated with photocatalysts using the dip-coating method, dried, and then used in the photocatalytic reactor. The treatment time was set at 1, 2, 3, and 4 h under different pH conditions.
5：Data Analysis Methods:
The modified Langmuir-Hinshelwood model was used to determine the rate of photocatalytic degradation of TCE. The hydroxyl radical conversion rate (ROH,UV) was calculated using a specific equation.
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