【摘 要】
：
银纳米颗粒(AgNPs)具有表面等离子体共振效应,对光催化反应具有显著的增强作用,但其合成通常需要额外的有机试剂作为还原剂,并且在无配体条件下AgNPs极易团聚.本工作在模拟太阳光下,利用环境水介质中广泛存在的天然有机质腐殖酸(HA)原位还原银离子(Ag+)形成稳定的AgNPs,对水中典型有机卤代污染物四溴双酚A(TBBPA)具有优异的光催化降解效果.当HA和Ag+浓度分别为1mg/L和0.2mmol/L时,AgNPs在1h内对2mg/L TBBPA的去除率达74.9％,远高于商用AgNPs的降解效果.通
【机 构】
：
中国科学技术大学应用化学系,安徽合肥230026
论文部分内容阅读
银纳米颗粒(AgNPs)具有表面等离子体共振效应,对光催化反应具有显著的增强作用,但其合成通常需要额外的有机试剂作为还原剂,并且在无配体条件下AgNPs极易团聚.本工作在模拟太阳光下,利用环境水介质中广泛存在的天然有机质腐殖酸(HA)原位还原银离子(Ag+)形成稳定的AgNPs,对水中典型有机卤代污染物四溴双酚A(TBBPA)具有优异的光催化降解效果.当HA和Ag+浓度分别为1mg/L和0.2mmol/L时,AgNPs在1h内对2mg/L TBBPA的去除率达74.9％,远高于商用AgNPs的降解效果.通过不同条件的对照实验发现,中性pH更有利于TBBPA的降解,降低了对实际应用中设备和反应条件的需求.同时,通过活性物种的抑制实验发现,光照HA原位还原Ag+生成的AgNPs具有较高的光催化活性,能够通过表面等离子体共振效应同时产生多种活性物种,包括单线态氧(1 O2)、羟基自由基(·OH)和超氧阴离子(O2·-),从而强化TBBPA的降解.因此,该工作实现了在温和条件下,通过廉价的HA原位还原生成具有高效光催化活性的AgNPs,在水中有机污染物的降解方面具有潜在的应用前景.
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