酸性条件下微米级锌铜双金属降解罗丹明B

通过置换反应得到最佳组成的微米级锌铜双金属（以下简称mZn/Cu），以罗丹明B为目标污染物，研究了溶液初始pH、mZn/Cu用量和罗丹明B浓度等因素对mZn/Cu降解罗丹明B的影响，并通过单因素实验，确定了罗丹明B降解的最优条件。与单金属材料相比，由于mZn/Cu构成微电池显著提高了其供给电子的能力和化学活性，从而导致罗丹明B被更为有效降解。通过向反应体系中充入氮气去除溶解氧和加入自由基捕集剂叔丁醇和对苯醌，罗丹明B的降解率均有显著降低，并证实了在酸性条件下溶解氧从mZn/Cu表面获得电子，产生出具有强氧化性的羟基自由基和超氧根自由基，最终导致罗丹明B的氧化降解。由此可见，研究不仅基于通过简单置换反应获得的mZn/Cu材料提出了1种新的高级氧化技术，而且还探讨了其作用机理，从而为实现低成本、高效率的水体有机污染物降解提供有价值的参考。

EFFICIENT DEGRADATION OF RHODAMINE B BY MICRO-SCALE ZINC-COPPER (mZn/Cu) BIMETALLIC PARTICLES UNDER ACIDIC CONDITION

In this paper, micro-scale zinc-copper (mZn/Cu) bimetallic particles were prepared via replacement reaction and applied in the removal of Rhodamine B. The effects of initial pH, mZn/Cu dosage and initial concentration on the degradation of Rhodamine B were investigated. The optimal conditions for the degradation of of Rhodamine B was determined through single-factor experiment. As compared with single metals, the formation of microbatteries on mZn/Cu greatly improved its ability to provide electrons and its chemical activity, resulting in more efficient degradation of Rhodamine B. When N₂ was bubbled into the reaction system to remove the dissolved oxygen and the scavengers such as tert-butyl alcohol (TBA) and benzoquinone (BQ) were introduced, the degradation of Rhodamine B was also greatly inhibited. This proved that under acidic and aerobic conditions, the dissolved oxygen could accepted electrons from the surface of mZn/Cu to produce ·OH and O₂-· radicals responsible for the rapid removal of Rhodamine B. Thus, this study not only provided a low-cost and high-efficiency technology for the degradation of organic contaminants in aqueous solution, but also put insight into the mechanism of the reaction.