Research On Catalytic Light Source And Intelligent Controller Of UV-LED Array

In recent years,antibiotics have been used extensively in human treatment.The characteristics of antibiotics that are difficult to degrade in water environment under natural conditions pose a great threat to the ecological environment.As an effective method to remove pollutants in the water environment,photocatalytic technology has been widely used in the degradation of pollutants.In the process of photocatalytic degradation of antibiotics,the light source is very important to its degradation efficiency.Compared with traditional catalytic light sources such as a high-pressure mercury lamp and ultraviolet fluorescent lamp,the UV-LED has higher energy efficiency.The spectral characteristics and light field distribution of the UV-LED array and highpressure mercury lamp were investigated.The results showed that the main wavelength of the UV-LED source was 275 nm and 440 nm in full-band.The main wavelength of the highpressure mercury lamp was 365 nm in the receiving range of P25 catalyst.The internal light intensity of antibiotic degradation platform of UV-LED array increased by 90.56% with the increase of radial distance,and the light intensity of axial distance increased.The degree of change was 9.37%.The effects of UV-LED array and high-pressure mercury lamp catalytic light source on the degradation rate of methyl orange and sulfamethazine were studied experimentally,and the distance degradation rate of degradation products per unit power was discussed.The experimental results show that the degradation process accords with the firstorder kinetics.The degradation rate and degradation rate of the degradation products are higher when the high-pressure mercury lamp is used as the catalytic light source than that of the UV-LED array,while the distance degradation rate of sulfamethazine is higher when the UV-LED array is used as the catalytic light source per unit power than that of the highpressure mercury lamp.An intelligent photocatalytic device based on narrowband Internet of Things(NB-IoT)is designed to monitor and control the device in real time.It consists of UV-LED array,RGBLED array,circulating fan,temperature and humidity sensor and gas concentration sensor.The degradation performance of methyl orange was tested.The results showed that the degradation process of methyl orange by the device accorded with the first-order kinetics.The degradation rate of methyl orange at the distance of unit power was consistent with the curve change trend when P25 was used as catalyst under the light source.According to the above spectrum analysis and application results,the UV-LED array is a competitive alternative light source for photocatalytic application,and the intelligent photocatalytic equipment based on NB-IoT provides a new idea for the practical application of photocatalysis.