超声波协同零价铁降解活性艳红X-3B  

Degradation of Reactive Red X-3B by Ultra Sound Synergized with Zero-Valent Iron

作　　者：汤心虎[1] 黄丽莎[1] 莫测辉[1] 李明玉[1] 

机构地区：[1]暨南大学环境工程系,广州510632

出　　处：《环境科学》2006年第6期1123-1126,共4页Environmental Science

基　　金：广东省自然科学基金项目(036716);广东省科技计划项目(2003C34505)

摘　　要：通过比较超声波、零价铁单独作用及其联用对X-3B的降解效果，探讨了超声波-零价铁体系降解X-3B的协同效应，考察了溶液pH、超声功率、超声时间等因素对协同效应的影响．结果表明，X-3B难以被超声波直接降解，在实验条件下获得的最高去除率仅为7．75％；在pH为5．0、7．0、9．0时，超声波与零价铁在降解X-3B时发生协同效应，相对两者单独作用对X-3B的去除率的简单加和，协同体系对X-3B的去除率分别提高1．68、1．76、1．67倍．在pH7．0时，协同处理25min后X-3B的去除率可达99．42％．在pH3．0时，零价铁直接还原X-3B的速率大于协同体系，但两者降解机理明显不同，前者仅把X-3B分解成小分子中间体，而后者可使X-3B彻底分解．研究认为，在pH5．0～7．0及超声功率为400～600W时，超声波一零价铁协同体系可有效地降解X-3B．The synergistic effects of ultra sound and zero-valent iron were studied by measuring the degradation of X-3B in zero-valent reduction, ultra sound degradation and synergistic systems. The effects of pH, ultra sound power and irradiation time on the synergistic system were explored. The results show that the X-3B is degraded difficultly by ultra sound and the total removal rate is less than 7.75% after 25min ultrasonic irradiation. When pH is 5.0, 7.0 and 9.0, the degradation rate of X-3B in synergistic system is about 1.68, 1.76 and 1.67 times, respectively, than the total removal rate of zero-valent iron reduction plus ultrasound degradatiorr After 25min ultrasonic irradiation in synergistic system, 99.42% of X-3B is removed at pH7.0. However, the degradation rate of X-3B in zero-valent iron reduction system is much higher than that of synergistic system at pH3,0. The degradation mechanism of X-3B in zero-valent iron reduction system is different from that of synergistic system. The X-3B is degraded into intermediate pollutants in the former, but is degraded completely in the latter. Accordingly, the X-3B can be degraded effectively in the synergistic system of zero-valent iron and ultra sound, when pH is 5.0-7.0 and the power of ultra sound is 400-600W.

关 键 词：超声波 零价铁 协同效应 活性艳红X-3B 

分 类 号：X788[环境科学与工程—环境工程] X791