研究目的
To prepare a polymer/graphite composite thin film as a cheap, and nontoxic photocatalyst that could be activated by visible light for the photodegradation of organic pollutants in water.
研究成果
The polystyrene/graphite composite thin film demonstrated effective photodegradation of MB and Rh-B under visible light, with optimal conditions being an alkaline medium and a light intensity of 80 wt. The film shows promise for water purification applications, though further research is needed to explore additional influencing factors.
研究不足
The study did not investigate the effects of temperature, contact time, the thickness and surface area of the film, and other preparation methods on the photodegradation process.
1：Experimental Design and Method Selection:
The study involved preparing a polystyrene/graphite composite thin film using a solution casting method. The film was characterized using UV/vis spectrophotometry and X-ray diffraction. SEM was used to examine the photocatalyst surface before and after photodegradation.
2：Sample Selection and Data Sources:
Graphite powder and polystyrene were used to prepare the composite film. Methylene blue (MB) and rhodamine B (Rh-B) were used as model dyes for photodegradation studies.
3：List of Experimental Equipment and Materials:
Graphite powder from Aldrich, toluene from BDH, UK, polystyrene (SABIC? PS 330), high-pressure mercury lamps (Philips, 20–120 W), magnetic stirrer (model Thermo Cimarec), UV–vis spectrophotometer (Jenway-6800, UK).
4：Experimental Procedures and Operational Workflow:
The composite film was prepared by mixing graphite powder with toluene, adding polystyrene, stirring, and drying. Photodegradation studies were conducted under varying conditions of dye concentration, pH, and light intensity.
5：Data Analysis Methods:
The degradation yield was calculated based on the initial and final concentrations of the dyes, measured using a spectrophotometer.
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