声化学降解染料结晶紫的研究

Sonochemical Degradation of Crystal Violet

采用频率为20 kHz的超声波降解阳离子染料结晶紫(CV)溶液,考察了溶液初始浓度、pH值、声能强度、时间、温度等因素对染料声化学降解过程的影响.实验结果表明,溶液初始浓度为30 mg/L、pH=8.0、声强=47.5 W/cm2、超声辐照50 m in,CV的脱色率达97.8%;CV的超声降解过程以高温热解反应为主,服从动力学一级反应;当超声/H2O2、超声/镁联合作用时,二者产生协同效应,溶液中产生大量OH自由基,强化了CV的声化学脱色和降解过程.

Sonochemical degradation of cationic dye crystal violet （CV） was studied. The effects of initial concentration, pH value, ultrasonic energy intensity, sonication time and medium temperature on the process were investigated. The results indicated that the process of ultrasound degradation of CV follows first-order reaction, and the process mainly depended on the pyrolysis reaction. The decolorizaion rate of CV reached up to 97.8% in 50 min at initial concentration 30 mg/L, pH8.0 and ultrasonic energy intensity 47.5 W/cm^2. The presence of H2O2 or magnesium over ultrasonic irradiation could produce OH radical, which enhanced the sonochemical decolorization and degradation of CV.