Silica micro- and nanoparticles reduce the toxicity of surfactant solutions

JOURNAL OF HAZARDOUS MATERIALS

卷:353

Article

Rios, Francisco¹  Fernandez-Arteaga, Alejandro¹  Fernandez-Serrano, Mercedes¹  Jurado, Encarnacion¹  Lechuga, Manuela¹ 

[1] Univ Granada, Dept Chem Engn, Fac Sci, Campus Fuentenueva S-N, E-18071 Granada, Spain

关键词: Silica nanoparticles;    Toxicity;    Nonionic surfactants;    Anionic surfactants;    Nanofluid;   

DOI  :  10.1016/j.jhazmat.2018.04.040

来源: Elsevier

【 摘 要 】

In this work, the toxicity of hydrophilic fumed silica micro- and nanoparticles of various sizes (7 nm, 12 rim, and 50 mu m) was evaluated using the luminescent bacteria Vibrio fischeri. In addition, the toxicity of an anionic surfactant solution (ether carboxylic acid), a nonionic surfactant solution (alkyl polyglucoside), and a binary (1:1) mixture of these solutions all containing these silica particles was evaluated. Furthermore, this work discusses the adsorption of surfactants onto particle surfaces and evaluates the effects of silica particles on the surface tension and critical micellar concentration (CMC) of these anionic and nonionic surfactants. It was determined that silica particles can be considered as non-toxic and that silica particles reduce the toxicity of surfactant solutions. Nevertheless, the toxicity reduction depends on the ionic character of the surfactants. Differences can be explained by the different adsorption behavior of surfactants onto the particle surface, which is weaker for nonionic surfactants than for anionic surfactants. Regarding the effects on surface tension, it was found that silica particles increased the surface activity of anionic surfactants and considerably reduced their CMC, whereas in the case of nonionic surfactants, the effects were reversed.

【 授权许可】

Free