TiO2-based nanoparticles released in water from commercialized sunscreens in a life-cycle perspective: Structures and quantities
TiO2-based nanoparticles released in water from commercialized sunscreens in a life-cycle perspective: Structures and quantities
复制标题
DOI：
10.1016/j.envpol.2011.03.003
复制
发表时间：
2011-06-01
影响因子：
8.9
通讯作者：
Bottero, Jean-Yves
中科院分区：
文献类型：
--
作者：
Botta, Celine;Labille, Jerome;Bottero, Jean-Yves
本文研究了四种含二氧化钛纳米复合材料的商业化防晒霜在水中人工老化过程中的物理化学演变。对防晒霜的矿物学和TiO2浓度进行了分析。对老化后形成的残渣进行了尺寸、形状、化学性质和表面性能的表征。结果表明，尽管它们具有非均相行为，但所有防晒霜都释放出相当一部分纳米tio2残留物。产生了稳定的亚微米级纳米颗粒聚集体，占防晒霜总量的38w /w%，并含有乳液中最初存在的纳米tio2总量的30%。测试了分散体的稳定性与盐浓度的关系，揭示了在海水条件下，这些纳米tio2残留物的大部分会聚集并沉积。将这些结果与防晒霜的消耗和生命周期相结合，以估计纳米tio2可能释放到水生环境中的量。(C) 2011 Elsevier Ltd.版权所有。
This work investigates the physical-chemical evolution during artificial aging in water of four commercialized sunscreens containing TiO2-based nanocomposites. Sunscreens were analyzed in terms of mineralogy and TiO2 concentration. The residues formed after aging were characterized in size, shape, chemistry and surface properties. The results showed that a significant fraction of nano-TiO2 residues was released from all sunscreens, despite their heterogeneous behaviors. A stable dispersion of submicronic aggregates of nanoparticles was generated, representing up to 38 w/w% of the amount of sunscreen, and containing up to 30% of the total nano-TiO2 initially present in the creams. The stability of the dispersion was tested as a function of salt concentration, revealing that in seawater conditions, a major part of these nano-TiO2 residues will aggregate and sediment. These results were put in perspective with consumption and life cycle of sunscreens to estimate the amount of nano-TiO2 potentially released into AQUATIC environment. (C) 2011 Elsevier Ltd. All rights reserved.