Abbasi Mahmood, Asl Nima Razzaghi
Colorant Manufacturing and Environmental Science Department, Institute for Colorants, Paints and Coatings, Tehran, Iran.
J Hazard Mater. 2008 May 30;153(3):942-7. doi: 10.1016/j.jhazmat.2007.09.045. Epub 2007 Sep 16.
The sonolysis of Basic Blue 41 dye in aqueous solution was performed at 35 kHz using ultrasonic power of 160 W and aqueous temperature of 25+1 degrees C within 180 min. The TiO2 nanoparticles were used as a catalyst to assist the sonication process. The effect of experimental parameters such as pH, H2O2 concentration and initial dye concentration on the reaction were investigated. It was recognized that in lower pH values the dye removal rate decreased. However, dye removal increased via increase in H2O2 concentration and lowering the initial dye concentration. All intermediate compounds were detected by integrated gas chromatography-mass spectrometry (GC/MS) and also ion chromatograph (IC). During the decolorization, all nitrogen atoms and aromatic groups of Basic Blue 41 were converted to urea, nitrate, formic acid, acetic acid and oxalic acid, etc. Kinetic studies revealed that the degradation process followed pseudo-first order mechanism with the correlation coefficient (R2) of 0.9918 under experimental conditions. The results showed that power ultrasound can be regarded as an appropriate tool for degradation of azo dyes to non-toxic end products.
在35千赫兹下，使用160瓦的超声功率，在25±1摄氏度的水温下，于180分钟内对碱性蓝41染料在水溶液中的声解进行了研究。二氧化钛纳米颗粒用作催化剂以辅助超声处理过程。研究了诸如pH值、过氧化氢浓度和初始染料浓度等实验参数对反应的影响。结果发现，在较低的pH值下，染料去除率下降。然而，通过增加过氧化氢浓度和降低初始染料浓度，染料去除率有所提高。所有中间化合物均通过气相色谱 - 质谱联用仪（GC/MS）和离子色谱仪（IC）进行检测。在脱色过程中，碱性蓝41的所有氮原子和芳香族基团均转化为尿素、硝酸盐、甲酸、乙酸和草酸等。动力学研究表明，在实验条件下，降解过程遵循准一级反应机制，相关系数（R2）为0.9918。结果表明，功率超声可被视为将偶氮染料降解为无毒最终产物的合适工具。
