研究目的
Investigating the adsorption and photocatalytic degradation of methylene blue using potassium polytitanate and solar simulator.
研究成果
The potassium polytitanate nanofibres effectively adsorb MB and are also capable of its photocatalytic degradation. The optimum operational conditions for the photocatalytic degradation of MB were found at 0.05 g/L of photocatalyst, 10 mg/L MB and pH 7. The stability of photocatalytic 'A' was studied for 3 degradation cycles and it was found that the overall degradation performance was reduced by almost 40% during the third cycle suggesting the need for more efficient regeneration process.
研究不足
The study indicates the formation of reaction intermediates and points out the difficulty of completely oxidizing organic dyes. A longer residence time may lead to a greater mineralization of the organic compounds.
1：Experimental Design and Method Selection:
Potassium polytitanate nanofibres were synthesized by an aqueous peroxide route at high pH and examined as photocatalysts for photodegradation of methylene blue (MB) using a solar simulator.
2：Sample Selection and Data Sources:
MB powder was dissolved in pure water to prepare a stock solution at a concentration of 10 mg/L.
3：List of Experimental Equipment and Materials:
Hydrochloric acid, sodium hydroxide, potassium hydroxide, methylene blue, Milli Q water, Luzchem Research SolSim Xenon photoreactor, orbital shaking incubator, Shimadzu UV-Vis 1700 spectrophotometer, Multi N/C 3100, Analytik Jena instrument, Metrohm ion chromatograph.
4：Experimental Procedures and Operational Workflow:
Dye adsorption experiments were carried out in an orbital shaking incubator operating at 150 rpm and 25 °C for 30 min to reach adsorption equilibrium. The photocatalytic activity of potassium polytitanate was assessed using 200 mL of MB solution.
5：Data Analysis Methods:
The kinetics of the photocatalytic discolouration of MB under different operating conditions were analysed by nonlinear data fitting to the equation: Ct = C0 e?kat.
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