研究目的
To demonstrate the application of Thermal Lens Microscopy (TLM) for monitoring the dynamics of a photocatalytic process in-situ, specifically the photocatalytic reduction of hexavalent chromium (Cr(VI)) in aqueous solution using CdS and irradiated with visible light.
研究成果
TLM technique, with its lower limit of detection (0.056 ppb), is a reliable alternative for measuring the concentration evolution of Cr(VI) during photocatalytic degradation processes, especially when the concentration is close to or below the limits imposed by international regulations for drinking water.
研究不足
The sensitivity of UV spectroscopy is limited to a few ppm, making it unreliable for concentrations of Cr(VI) below the limits established by international standards for drinking water. TLM offers a more reliable alternative with a lower limit of detection.
1：Experimental Design and Method Selection:
The study employs Thermal Lens Microscopy (TLM) to monitor the photocatalytic reduction of Cr(VI) in aqueous solution using CdS photocatalyst under visible light irradiation.
2：Sample Selection and Data Sources:
Aqueous solutions of Cr(VI) with concentrations ranging from
3：0 to 4 ppm of K2Cr2O7 were used. List of Experimental Equipment and Materials:
The setup includes a pump laser (LSR 532NL-300, 532 nm wavelength, 10 mW power), a probe laser (HeNe JDS Uniphase 1145P,
4：8 nm wavelength, 35 mW power), a mechanical optical chopper (Thorlabs MC 2000), a photodiode (THORLABS DET-36 A/M), and a digital oscilloscope (BK PRECISION 2542B). Experimental Procedures and Operational Workflow:
6 The pump laser beam is focused onto a small region of the sample, modulated in intensity, and the probe laser beam senses the thermal lens effect. The signal is measured using a photodiode and oscilloscope.
5：Data Analysis Methods:
The concentration of Cr(VI) is calculated using a calibration curve obtained from TLM measurements.
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