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Chemcial Industry and Engineering 2022, Vol. 39 Issue (6) :93-100    DOI: 10.13353/j.issn.1004.9533.20220112
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Experimental study on degradation of methylene blue wastewater by sonochemical microreactor
CHENG Yang, WANG Dong, LIU Huiyang, LIU Peipei, SHI Sai, XIA Xiaolu, YU Jianfeng
School of Mechanical Engineering, Jiangnan University, Jiangsu Key Laboratory of Food Manufacturing Equipment and Technology, Jiangsu Wuxi 214122, China

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Abstract To improve the degradation efficiency of methylene blue (MB) by Fe2+ activated sodium persulfate (SPS), a sonochemical microreactor was designed. Firstly, the effects of pH of MB and FeSO4 mixture, FeSO4 concentration and SPS concentration on degradation rate of MB in static system, magnetic stirring system, capillary microreactor system and sonochemical microreactor system were studied. Secondly, the effects of channel structure and solution flow rate on the degradation rate of MB were studied in the capillary microreactor system and sonochemical microreactor system. The results show that the degradation rate of MB in the sonochemical microreactor system is higher than that in other systems under different pH of MB and FeSO4 mixture and FeSO4 concentration. The degradation rate of MB increased with the increase of SPS concentration, but the increase of SPS concentration would affect the degradation of MB in the sonochemical microreactor system. Compared with linear, triangular and semicircular channel structures, MB degrades more efficiently in rectangular channel structures. When the residence time of the solution in the pipeline is the same, increasing the solution flow rate of the injection pump is more beneficial to the oxidative degradation reaction. The experimental results show that when the concentration of MB was 0.2 mmol·L-1, the pH of MB and FeSO4 mixture was 3, the concentration of FeSO4 was 1.4 mmol·L-1, the concentration of SPS was 1.8 mmol·L-1, the channel structure was rectangular waveform, and the solution flow rate was 13.16 cm·s-1, the degradation rate of MB in sonochemical microreaction system reached 85.45%.
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CHENG Yang
WANG Dong
LIU Huiyang
LIU Peipei
SHI Sai
XIA Xiaolu
YU Jianfeng
Keywordssonochemical microreactor   degradation   ferrous ion   sodium persulfate   methylene blue     
Received 2022-01-28;
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CHENG Yang, WANG Dong, LIU Huiyang, LIU Peipei, SHI Sai, XIA Xiaolu, YU Jianfeng.Experimental study on degradation of methylene blue wastewater by sonochemical microreactor[J]  Chemcial Industry and Engineering, 2022,V39(6): 93-100
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