Abstract:
The integration of LED technology with photocatalysis has emerged as a promising approach for environmental remediation and energy conversion. The efficacy of this hybrid system is significantly influenced by the power selection of the LED photocatalytic light source. This study systematically investigates the impact of LED power on the performance of photocatalytic reactions, focusing on parameters such as light intensity, photon flux, and the subsequent effect on photocatalyst activity. By employing a range of LED powers and analyzing the resultant photocatalytic efficiencies, we aim to establish optimal power settings that maximize the treatment efficiency while minimizing energy consumption.

Introduction:
Light-emitting diodes (LEDs) have garnered considerable attention due to their energy efficiency, longevity, and tunability in wavelength, making them ideal candidates for photocatalytic applications. Photocatalysis, a process that utilizes light to drive chemical reactions, has found applications in water purification, air detoxification, and self-cleaning surfaces. The efficiency of photocatalysis is closely tied to the characteristics of the incident light, including its intensity, wavelength, and photon flux, which are directly influenced by the power of the LED light source. Therefore, selecting an appropriate LED power is crucial for optimizing the performance of photocatalytic systems.

Materials and Methods:

1. LED Selection: A series of LEDs with varying powers (ranging from 1 W to 10 W) and consistent wavelengths suitable for activating the chosen photocatalyst were selected.

2. Photocatalyst Preparation: A standard photocatalyst (e.g., TiO2) was synthesized and characterized to ensure uniformity across all experiments.

3. Experimental Setup: The LEDs were mounted in a reactor configuration, with the photocatalyst uniformly coated on a substrate placed at a fixed distance from the light source.

4. Performance Evaluation: The photocatalytic efficiency was assessed by monitoring the degradation rate of a model pollutant (e.g., methylene blue) under various LED powers.

5. Data Analysis: The collected data were analyzed using statistical methods to identify trends and establish correlations between LED power and photocatalytic performance.

Results and Discussion:

• Light Intensity and Photon Flux: As expected, an increase in LED power led to a corresponding increase in light intensity and photon flux. This enhancement resulted in a higher number of photons interacting with the photocatalyst, promoting the generation of reactive species (e.g., hydroxyl radicals) essential for pollutant degradation.

• Photocatalytic Efficiency: Initially, with increasing LED power, the photocatalytic efficiency increased due to the intensified light-matter interaction. However, beyond a certain threshold (typically observed around 5-6 W in our experiments), the efficiency plateaued or even declined slightly. This phenomenon can be attributed to factors such as light scattering, heat generation, and potential photocatalyst deactivation at high intensities.

Conclusion:
The power selection of LED photocatalytic light sources is a critical parameter influencing the overall performance of photocatalytic systems. By systematically evaluating the impact of LED power on light intensity, photon flux, and photocatalytic efficiency, this study has demonstrated that moderate power settings (approximately 5 W) offer optimal conditions for efficient pollutant degradation while maintaining energy efficiency. Future research should further explore the interplay between LED characteristics, photocatalyst properties, and reactor design to refine these findings and develop more sustainable and efficient photocatalytic technologies.

Keywords: LED, photocatalysis, light intensity, photon flux, energy efficiency, pollutant degradation.