Journal of Nanoparticle Research ( IF 2.1 ) Pub Date : 2021-08-21 , DOI: 10.1007/s11051-021-05315-0 Liqiang Tan 1 , Chuyun Zhou 1 , Lu Ding 1 , Zhengjie Liu 2
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The environmental behavior and ultimate fate of the engineered nanoparticles could inevitably be affected by the widespread dissolved organic matter and sunlight irradiation in the natural environment. In this study, an analysis combined with experimental investigations was used to explore the influence of humic acid (HA) and UV irradiation on the changes in surface charge and aggregation behavior of TiO2 nanoparticles. A prolonged UV irradiation caused the point of zero charge (PZC) of TiO2 nanoparticles shifted to lower values and the aggregate size reached to a maximum value at the PZC. TEM image and FT-IR spectroscopy analysis confirmed the formation of TiO2 cluster aggregates and successive growth of the hydroxyl groups on different sites on TiO2 surface, respectively, although no effect of irradiation on the phase transformation of TiO2 nanoparticles was observed through the use of Raman spectroscopy. The fluorescence spectroscopy analysis illustrated the interactions between the surface hydroxyls formed during UV irradiation on TiO2 surface and functional groups on HA molecules, which accelerated the aggregation process of TiO2 nanoparticles. Widespread HA and UV irradiation in the natural environment significantly altered the surface properties and stability of the nanoparticles in aqueous environments.
Graphical abstract
中文翻译：
腐植酸和紫外线照射下影响TiO2纳米颗粒表面电荷和聚集行为的综合因素
工程纳米粒子的环境行为和最终归宿不可避免地受到自然环境中广泛溶解的有机物和阳光照射的影响。在本研究中，分析结合实验研究用于探讨腐殖酸 (HA) 和紫外线照射对 TiO 2纳米粒子表面电荷和聚集行为的变化的影响。长时间的紫外线照射导致 TiO 2纳米粒子的零电荷点 (PZC)移至较低值，并且聚集体尺寸在 PZC 处达到最大值。TEM 图像和 FT-IR 光谱分析证实了 TiO 2簇聚集体的形成和羟基在 TiO 不同位点上的连续生长尽管通过使用拉曼光谱没有观察到辐照对 TiO 2纳米颗粒的相变的影响，但分别在2表面。荧光光谱分析说明了紫外线照射在TiO 2表面形成的表面羟基与HA分子上的官能团之间的相互作用，这加速了TiO 2纳米颗粒的聚集过程。自然环境中广泛的 HA 和紫外线照射显着改变了纳米粒子在水性环境中的表面特性和稳定性。
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