Photocatalysis has a potential to become a cost effective industrial process for water cleaning. One of the most studied photocatalysts is titanium dioxide which, as a wide band gap semiconductor, requires ultraviolet (UV) light for its photoactivation. This is at the wavelengths where the efficiency of present-day light emitting diodes (LEDs) decreases rapidly, which presents a challenge in the use of UV-LEDs for commercially viable photocatalysis. There is also a need for accurate photocatalysis measurement of remediation rates of water-borne contaminants for determining optimum exposure doses in industrial applications. In response to these challenges, this paper describes a UV-LED based photocatalytic test reactor that provides a calibrated adjustable light source and pre-defined test conditions to remove as many sources of uncertainty in photocatalytic analysis as possible and thereby improve data reliability. The test reactor provides a selectable intensity of up to 1.9 kW m⁻² at the photocatalyst surface. The comparability of the results is achieved through the use of pre-calibration and control electronics that minimize the largest sources of uncertainty; most notably variations in the intensity and directionality of the UV light emission of LEDs and in LED device heating.

中文翻译：

---

用于水净化和光催化特性表征的基于UV-LED的校准光源

光催化有可能成为水净化的经济有效的工业过程。研究最多的光催化剂之一是二氧化钛，作为宽带隙半导体，它需要紫外线（UV）才能进行光活化。这是在当今发光二极管（LED）的效率迅速降低的波长处，这在将UV-LED用于商业上可行的光催化中提出了挑战。还需要精确测定水污染物的修复速率的光催化作用，以确定工业应用中的最佳暴露剂量。为了应对这些挑战，本文介绍了一种基于UV-LED的光催化测试反应器，该反应器提供了经过校准的可调光源和预定义的测试条件，以消除光催化分析中尽可能多的不确定性来源，从而提高数据的可靠性。测试反应堆可提供高达1.9 kW m的可选强度在光催化剂表面为^-2。结果的可比性是通过使用预校准和控制电子设备来实现的，这些电子设备可以最大程度地减少最大的不确定性来源；最值得注意的是，LED的紫外线发射的强度和方向性以及LED器件加热方面的变化。