表面活性剂修饰氧化铋形貌及其超声降解性能研究

本实验分别用阴离子表面活性剂十二烷基硫酸钠(SDS)和十二烷基苯磺酸钠(SDBS)、阳离子表面活性剂十六烷基三甲基溴化铵(CTAB)以及两种表面活性剂耦合进行修饰氧化铋形貌,并对修饰后的样品进行XRD、EDS、XPS、SEM等表征分析;同时探讨了表面活性剂修饰后的氧化铋在超声作用下对直接大红的最佳投加量和降解性能.结果表明:催化剂的最佳投加量为75 mg,最佳降解性能的样品为阴阳离子表面活性剂耦合修饰的氧化铋;当催化剂投加量为75 mg、初始浓度为10 mg·L-1、超声频率为45 k Hz、功率为100 W时,表面活性剂SDBS与CTAB在比例为1∶1耦合时修饰的氧化铋在20 min内对直接大红的总去除率达到99.4%,比空白实验提高16倍多.

Study on the morphology of bismuth oxide modified with surfactants and its ultrasonic degradation performance

In this study, anionic surfactant sodium dodecyl sulfate (SDS), sodium dodecyl benzene sulfonate (SDBS) and cationic surfactant cetyl trimethyl ammonium bromide (CTAB) were used to modify the morphology of bismuth oxide. The samples were characterized by using XRD, EDS and XPS, SEM. The optimum dosage and the degradation performance of modified bismuth oxide on congo red were investigated in the presence of ultrasonic irradiation. The results indicate that optimum dosage of catalyst is 75 mg, and optimal degradation properties of the Bi₂O₃ was synthesized via the mixture of anionic and cationic surfactants. When a catalyst dosage of 75 mg, an initial concentration of 10 mg·L^-1, an ultrasonic frequency of 45 kHz and an ultrasonic power of 100 W, the bismuth oxide modified with SDBS to CTAB=1:1 possess optimal performance. The removal rate was up to 99.4% in just 20 minutes, and the total removal rate increased more than 16 times comparing with that of blank control experiment.