超声波降解溴苯:操作参数与环境因素的影响

Degradation of aqueous bromobenzene by ultrasound: influences of operative parameters and environmental factors

本文考察了用超声波降解水中溴苯的动力学与脱卤效应,并研究了重要的操作参数如强度与饱和气体,以及环境干扰因素如悬浮物、地表水其他杂质的影响。结果表明,超声波可以有效地处理溴苯,在20kHz,7.5W／cm2下一级反应常数达0.044／min,脱卤效率达58％。本研究范围内,声强度越高,反应越快。氧气和氩气下降解速率高于空气下。超声降解不受地表水中杂质、纳米级微粒、无机颗粒的影响,但有机悬浮物能在一定程度上干扰溴苯的超声降解。

The kinetics of de-halogenation during bromobenzene degradation by ultrasound are studied in this paper. Affecting factors studied include important operative parameters such as the acoustic intensity and saturating gases and environmental impurities such as suspended solids and impurities found in surface water. The results show that ultrasound can degrade aqueous bromobenzene efficiently, with the 1st order rate constant being 0.044/min at 20kHz, 7.5W/cm2 with 58% dehalogenation. Higher sound intensity leads to more rapid degradation. Saturation with oxygen or argon strengths sonication more compared to that saturated with air. The reaction is not influenced by the surface water impurities, nm size particles and inorganic particles, but is slowed down by organic suspended particles.