【摘要】 为提高Fe²⁺活化过硫酸钠（SPS）降解亚甲基蓝（MB）的效率，设计了一种声化学微反应器。首先研究了静置系统、磁力搅拌系统、毛细管微反应器系统和声化学微反应器系统中MB和硫酸亚铁（FeSO₄）混合液pH值、FeSO₄浓度、SPS浓度对MB降解率的影响。其次，在声化学微反应器系统和毛细管微反应器系统中研究了流道结构和流速对MB降解率的影响。结果表明：在不同的MB和FeSO₄混合液pH值、FeSO₄浓度下，声化学微反应器系统中MB降解率均高于其他反应系统。随着SPS浓度的增加，MB降解率呈上升趋势，但在声化学微反应器系统中增加SPS浓度会影响MB降解。相比于直线形、三角波形和半圆波形流道结构，MB在矩形波形流道结构中降解效率更高。溶液在管道内停留时间相同时，增加流速更有利于氧化降解反应的进行。实验表明：当MB浓度为0.2 mmol·L^-1,MB和FeSO₄混合液pH值为3、FeSO₄浓度为1.4 mmol·L^-1、SPS浓度为1.8 mmol·L^-1,流道结构为矩形波形，流速为13.16 cm·s^-1时，声化学微反应系统中MB降解率达到85.45%。更多还原

【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%.更多还原