Experimental study on degradation of methylene blue wastewater by capillary microreactor

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Abstract In order to improve the efficiency of Fe²⁺ activated sodium persulfate(SPS) to degrade methylene blue(MB), a capillary microreactor was designed. Compared to magnetic stirring and static reaction system, the effect of pH of MB and FeSO₄ mixture, FeSO₄ concentration, SPS concentration, feed flow rate and capillary length on the degradation rate of MB in the capillary microreactor were studied. The results showed that with the increase of the pH of the mixture of MB and FeSO₄, the degradation rate of MB first increased and then decreased; with the increase of FeSO₄ concentration, the degradation rate of MB first increased and then decreased; when the SPS concentration increased from 0.2 mmol·L^-1 to 1.8 mmol·L^-1, the MB degradation rate increased significantly. If the SPS concentration continued to increase, the MB degradation rate increased slowly. With the increase of feed flow rate and water bath temperature, the degradation rate of MB increased. With the increase of capillary length and the decrease of feed flow rate, the degradation rate of MB increased. Under the same reaction conditions, the oxidative degradation performance of the capillary microreactor is better than the magnetic stirring and static reaction system. When the concentration of MB is 0.2 mmol·L^-1, pH of the mixture of MB and FeSO₄ is 3, FeSO₄ concentration is 1.4 mmol·L^-1, SPS concentration is 1.8 mmol·L^-1, feed flow rate is 1 mL·min^-1, and capillary length is 6.32 m, the MB degradation rate can reach 85.92%.

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	WANG Dong
	XIA Xiaolu
	LIU Huiyang
	SHI Sai
	YU Junnan
	YU Jianfeng

Keywords： capillary microreactor Fe²⁺ sodium persulfate methylene blue degradation

Received 2021-07-10;

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WANG Dong, XIA Xiaolu, LIU Huiyang, SHI Sai, YU Junnan, YU Jianfeng.Experimental study on degradation of methylene blue wastewater by capillary microreactor[J] Chemcial Industry and Engineering, 2022,V39(4): 65-70

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