研究目的
To decompose dimethyl phthalate (DMP) using the liquid phase plasma (LPP) method with TiO2 photocatalysts and hydrogen peroxide, and to study the effects of various parameters on the decomposition rate.
研究成果
The LPP process, especially when combined with TiO2 photocatalysts and hydrogen peroxide, is effective for the decomposition of DMP. The decomposition rate is influenced by the applied voltage, pulse width, frequency, and the amounts of TiO2 and hydrogen peroxide. The study provides insights into the degradation pathway of DMP and the synergistic effects of combining different processes.
研究不足
The study found that excessive addition of TiO2 photocatalyst powder or hydrogen peroxide decreased the decomposition rate due to decreased conductivity, blocking of ultraviolet light, and scavenger effect. The optimal conditions for the LPP process need to be carefully controlled to achieve the highest decomposition efficiency.
1：Experimental Design and Method Selection:
The study used the LPP method with TiO2 photocatalysts and hydrogen peroxide to decompose DMP. The effects of applied voltage, pulse width, frequency, and the addition of TiO2 and hydrogen peroxide were examined.
2：Sample Selection and Data Sources:
DMP was purchased from Aldrich and used without further purification. Deionized water was used for the preparation of the DMP reactant aqueous solution.
3：List of Experimental Equipment and Materials:
The LPP system included a high-frequency bipolar pulse type power generator, a quartz LPP reactor with tungsten electrodes, and a cylindrical double jacket type aqueous reactant tank. TiO2 powder (P-25, Degussa) and hydrogen peroxide were used.
4：Experimental Procedures and Operational Workflow:
The DMP aqueous reactant solution was circulated to the LPP reactor at a flow rate of 500 mL/min. The decomposition rate was measured by HPLC, and intermediates were analyzed by GC/MS.
5：Data Analysis Methods:
The DMP concentration was measured by HPLC, and the intermediates were analyzed by GC/MS. The decomposition rate constants were calculated based on the concentration measurements.
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