State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, PR China.
J Hazard Mater. 2011 Dec 15;197:88-96. doi: 10.1016/j.jhazmat.2011.09.056. Epub 2011 Oct 1.
A novel, simple and efficient approach for degrading organic dye, based on BiAg(x)O(y) (bismuth silver oxide, BSO), is reported for the first time. The oxidative powder BSO was prepared by simple coprecipitation of NaBiO(3)·2H(2)O and AgNO(3). The technique was evaluated for the decolorization and oxidative decomposition of Rhodamine B (RhB). The results demonstrated that mixing BSO with an aqueous solution of RhB (20 mg/L) resulted in rapid decolorization (pseudo-first-order kinetic constant k=0.5594 min(-1)) and formation of several small molecular weight products. Significant reduction in TOC (32% TOC removal in 10 min) also occurred via mineralization of RhB to CO(2)/CO(3)(2-). The reaction proceeds at ambient temperature and pressure, and requires no external energy sources or light. An advantage of the technique is that BSO can be used to degrade sequential additions of dye without significant fouling or loss of activity. The characterization of BSO and its corrosion products by XRD, FTIR, TEM, EDX and XPS revealed that Ag species were reduced to metallic silver and NaBiO(3)·2H(2)O was transformed into the Bi(2)O(2)CO(3) during the reaction process. Singlet oxygen ((1)O(2)) was identified as the major reactive species generated by BSO for the degradation of RhB and several other dyes. This novel approach could be used as a highly efficient and green technology for organic dye degradation.
一种基于 BiAg(x)O(y)（氧化铋银，BSO）的新型、简单、高效的有机染料降解方法被首次报道。BSO 是通过简单的共沉淀法由 NaBiO(3)·2H(2)O 和 AgNO(3)制备得到的。该技术用于 Rhodamine B（RhB）的脱色和氧化分解评估。结果表明，BSO 与 RhB 的水溶液（20 mg/L）混合导致快速脱色（假一级动力学常数 k=0.5594 min(-1)) 和形成几个小分子产物。通过 RhB 的矿化作用（在 10 分钟内去除 32%的 TOC）也显著降低了 TOC。该反应在环境温度和压力下进行，不需要外部能源或光照。该技术的一个优点是 BSO 可以用于降解连续添加的染料，而不会产生明显的污垢或活性损失。BSO 及其腐蚀产物的 XRD、FTIR、TEM、EDX 和 XPS 表征表明，Ag 物种被还原为金属银，NaBiO(3)·2H(2)O 在反应过程中转化为 Bi(2)O(2)CO(3)。单线态氧（(1)O(2))被鉴定为 BSO 用于 RhB 和其他几种染料降解的主要活性物质。这种新方法可以用作高效、绿色的有机染料降解技术。
