Performance study of high power UV-LED heat dissipation and nano-TiO2 photocatalytic acid red 26 coupling system

doi:10.16085/j.issn.1000-6613.2022-1920

Abstract

Abstract:

In this paper, a coupling system of high-power UV-LED heat dissipation and nano TiO₂ photocatalysis acid red 26 was designed. The sewage was circulated to cool UV-LED, which could improve the working efficiency of lamp beads and realize the photocatalytic degradation and decolorization of sewage. The combination of ultraviolet light source cooling and sewage circulation system was the innovation of this paper. The layout of UV LED lamp beads was simulated and optimized. With wastewater decolorization as the probe reaction, it was found that wastewater cooling could reduce the junction temperature of UV-LED by 41.2%, the average irradiance and wastewater decolorization efficiency were increased by 11.03% and 1.68 times, respectively. The results showed that the photocatalytic activity was inversely proportional to the pollutant concentration. It was proportional to the initial concentration of catalyst and tended to be stable after reaching 0.75g/L. Considering the influence of adsorption and oxidation groups on the degradation rate, the optimal pH value was 2. Compared with the traditional annular reactor, the apparent quantum yield (AQY) and decolorization efficiency of the coupling system were 2.3 times and 4.3 times, respectively, and the energy consumption was only 9.1%. The coupling system had potential application value in the field of UV-LED temperature control and wastewater treatment.

Key words: high-power UV-LED, optimal design, heat dissipation performance, photocatalysis, waste water

摘要：

设计了大功率UV-LED散热和纳米TiO₂光催化酸性红26耦合系统，采用污水循环冷却UV-LED提高灯珠工作效率的同时实现污水光催化降解脱色，将污水循环系统与紫外光源冷却耦合是创新点。采用模拟优化UV-LED灯珠排布，以污水脱色为探针反应，发现污水冷却能使UV-LED结温降低41.2%，平均辐照度和污水脱色效率分别提高11.03%和1.68倍。环境因素对污水降解性能影响结果表明，光催化活性与污染物浓度成反比，与催化剂初始浓度成正比，达0.75g/L后趋于稳定；考虑吸附和氧化基团对降解速率影响，最优pH为2。本设计与传统环隙式反应器对比，表观量子产率和脱色效率分别是后者的2.3倍和4.3倍，能耗仅为后者的9.1%。该耦合系统在UV-LED的温度控制和废水处理领域具有潜在应用价值。

关键词: 大功率UV-LED, 优化设计, 散热性能, 光催化, 废水

CLC Number:

O657

WANG Chen, BAI Haoliang, KANG Xue. Performance study of high power UV-LED heat dissipation and nano-TiO₂ photocatalytic acid red 26 coupling system[J]. Chemical Industry and Engineering Progress, 2023, 42(9): 4905-4916.

王晨, 白浩良, 康雪. 大功率UV-LED散热与纳米TiO₂光催化酸性红26耦合系统性能[J]. 化工进展, 2023, 42(9): 4905-4916.

Figures/Tables 19

References 45

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排布方式	辐照度最大值/W∙m^-2	辐照度平均值/W∙m^-2	均匀度/%
均匀排布	416.68	178.68	65.06
五边形排布	442.99	179.79	64.08
二三形排布	603.65	180.24	37.54

排布方式	辐照度最大值/W∙m^-2	辐照度平均值/W∙m^-2	均匀度/%
均匀排布	416.68	178.68	65.06
五边形排布	442.99	179.79	64.08
二三形排布	603.65	180.24	37.54

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Performance study of high power UV-LED heat dissipation and nano-TiO₂ photocatalytic acid red 26 coupling system

大功率UV-LED散热与纳米TiO₂光催化酸性红26耦合系统性能

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