College of Land Science and Technology, China Agricultural University, Key Laboratory of Plant-Soil Interactions, Ministry of Education, and Key Laboratory of Arable Land Conservation (North China), Ministry of Agriculture, Beijing 100193, PR China.
Department of Earth Sciences, Memorial University St. John's, Newfoundland and Labrador A1B 3X5, Canada.
J Hazard Mater. 2021 Aug 15;416:125910. doi: 10.1016/j.jhazmat.2021.125910. Epub 2021 Apr 19.
The application of livestock manure and aquaculture wastewater into agricultural soil introduces animal manure-derived colloids into the environment. These manure-derived colloids generally contain different organic matter components and may facilitate nanoparticle transport to the subsurface. This study investigated the interaction between manure-derived colloids (cow and pig manures) and titanium dioxide (TiO) nanoparticles at neutral pH. The effect of this interaction on the stability, aggregation, and transport of TiO in a saturated porous media was studied. Our study found that cow manure-derived colloids have many humic-like substances, and pig manure-derived colloids contain many protein components and some humic-like substances. The interactions of different manure-derived colloids with TiO can affect the ζ-potential and aggregation status of TiO in the aqueous system. The results showed that cow manure-derived colloids slightly increased the TiO transport due to electrostatic repulsion, while pig manure-derived colloids substantially increased the TiO mobility in porous media because of both electrostatic repulsion and steric hindrance. Since both animal manure and TiO are ubiquitously present in the natural environment, manure-derived colloids can change the surface properties of TiO and facilitate TiO transport in the subsurface.
将牲畜粪便和养殖废水施用到农业土壤中会将源自动物粪便的胶体引入环境中。这些源自粪便的胶体通常含有不同的有机物成分，可能会促进纳米颗粒向地下的迁移。本研究在中性 pH 值条件下调查了源自粪便的胶体（牛和猪粪便）与二氧化钛（TiO）纳米颗粒之间的相互作用。研究了这种相互作用对 TiO 在饱和多孔介质中稳定性、聚集和迁移的影响。我们的研究发现，牛粪便衍生胶体含有许多类腐殖质物质，而猪粪便衍生胶体含有许多蛋白质成分和一些类腐殖质物质。不同源自粪便的胶体与 TiO 的相互作用会影响 TiO 在水系统中的 ζ 电位和聚集状态。结果表明，由于静电排斥，牛粪便衍生胶体略微增加了 TiO 的迁移，而猪粪便衍生胶体由于静电排斥和空间位阻的共同作用，大大增加了 TiO 在多孔介质中的迁移性。由于动物粪便和 TiO 都广泛存在于自然环境中，因此源自粪便的胶体可以改变 TiO 的表面性质，并促进 TiO 在地下的迁移。
