To address the pollution problem of organic dyes, monodispersed anionic silver nanoparticles (AgNPs) with an average size of 6 nm were prepared in water media via chemical reduction method from oleic acid and n-butyl amine. The aqueous solution of the resultant AgNPs was utilized as a photocatalyst to investigate the adsorption and photodegradation behaviors of organic dyes under different light irradiation. The morphology and surface characteristics of the synthesized AgNPs were probed using TEM, XRD, FTIR and zeta potential analysis. The adsorption and degradation process of organic dyes on the AgNPs were characterized in details by UV–Vis spectrophotometer. The results showed that the AgNPs exhibited a characteristic charge- and size-selective adsorption of dyes owing to the profoundly negative charged surface, which enables the AgNPs to possess high selective degradation of Methylene Blue. More still, due to the surface plasmon resonance (SPR) effect of AgNPs, the obtained AgNPs presented a higher photocatalytic activity to Methylene Blue under UV light, visible light, and solar light compared with commercial photocatalysts. The 5 cyclic reactions revealed its high stability and reusability. In a nutshell, the proposed mechanism systematically combined the selective adsorption and the SPR effect to explain the detailed photocatalytic process of the obtained AgNPs.

为了解决有机染料的污染问题，在水介质中通过油酸和正丁醇的化学还原法制备了平均粒径为6 nm的单分散阴离子银纳米颗粒（AgNPs）。丁胺。将所得AgNPs的水溶液用作光催化剂，以研究有机染料在不同光照射下的吸附和光降解行为。使用TEM，XRD，FTIR和ζ电位分析仪对合成的AgNPs的形貌和表面特性进行了探测。用紫外可见分光光度计详细描述了有机染料在AgNPs上的吸附和降解过程。结果表明，由于具有深负电荷的表面，AgNPs对染料表现出特征性的电荷和大小选择性吸附，这使AgNPs具有对亚甲基蓝的高选择性降解。此外，由于AgNP的表面等离子体共振（SPR）效应，与市售光催化剂相比，所获得的AgNPs在紫外光，可见光和太阳光下对亚甲基蓝具有更高的光催化活性。5个循环反应显示出其高稳定性和可重复使用性。简而言之，所提出的机制系统地结合了选择性吸附和SPR效应来解释获得的AgNPs的详细光催化过程。