Rapid photodegradation of methylene blue by laser-induced plasma |
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Authors: | Jie Jiang Na Xie Yilan Jiang Jinghua Han Guoying Feng Zhongbing Shi Changtao He |
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Affiliation: | College of Electronics and Information Engineering, Sichuan University, Chengdu 610065 China.; Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621999 China ; Southwestern Institute of Physics, Chengdu 610041 China ; Sichuan Jiuzhou Electric Group Co., Ltd, Mianyang 621000 China |
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Abstract: | A new strategy was established for the degradation of wastewater-based organic pollutants. Laser-induced plasma (LIP) was used as an alternative UV light source to realise rapid photodegradation of methylene blue (MB), an organic pollutant. A conventional 1064 nm Nd:YAG laser was used for plasma excitation to degrade MB solutions. The results show that the LIP effectively degraded the organic matter, and the degradation efficiency was related to the UV component with wavelength less than 400 nm. The compositions of the plasma excited by different dielectric substrates are different owing to various mechanisms involving moderate heat dissipation and sonoluminescence. However, metallic substrates, especially Fe, can enhance the proportion of UV light and accelerate the degradation efficiency. In the process of methylene blue degradation, solution parameters, such as initial dye concentration, pH, irradiation time and hydrogen peroxide concentration, will affect the degradation efficiency. The conditions of effective degradation of methylene blue (10 mg L−1 MB−1 concentration, 50 mL L−1 H2O2 concentration, pH = 3 and P = 60 mW) were obtained in this study, which can provide reference for practical application.A new strategy was established for the degradation of wastewater-based organic pollutants. |
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