聚乙烯纳米塑料和铁 (水) 氧化物之间的结晶性依赖的异质聚合和共同沉积
Jingyi He1, Pingxiao Wu2, Leiye Sun1
1School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, PR China.
Journal of environmental management
|April 24, 2025
概括
矿物质结晶性显著影响铁 () 氧化物和纳米塑料之间的相互作用. 高晶体铁 () 氧化物增强纳米塑料的聚合,影响它们的环境命运和沉积.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 化学 化学 化学
背景情况:
- 铁 () 氧化物 (IO) 和纳米塑料 (NP) 在水生环境中普遍存在.
- IOs和NP之间的相互作用会影响它们的环境行为和命运.
- 矿物质的特性,如结晶性,是NP-矿物质异质聚合的关键因素.
研究的目的:
- 研究聚乙烯纳米塑料 (PSNPs) 和具有不同晶度的IO之间的异质聚合和共同沉积.
- 阐明IO结晶性在与PSNPs的相互作用机制和能力中的作用.
- 了解这些相互作用如何影响IO和NP的环境命运.
主要方法:
- 测量泽塔电位以评估表面电荷和静电相互作用.
- DLVO (Derjaguin-Landau-Verwey-Overbeek) 对于静电吸引力的理论计算. 静电吸引力的理论计算.
- 福里埃变换红外光谱法 (FTIR) 和二维相关性光谱法 (2D-COS) 用于分析结合.
- pH和离子强度变化实验以研究异质聚合趋势.
主要成果:
- 随着晶度的增加,IO zeta潜力增加,导致负电荷的PSNP具有更强的静电吸引力.
- 异质聚合能力随着pH和离子强度的增加而下降.
- 在高度结晶的IO和PSNP之间观察到强烈的键,增强聚合.
- 在IO上PSNP异质聚合中和或反转表面电荷,影响聚合物沉积.
结论:
- IO结晶性是与PSNP进行异质聚合的关键因素.
- 结合和静电力在IO-PSNP相互作用中起着重要作用.
- 了解这些相互作用对于预测环境命运和同时发生的污染物的运输至关重要.
更多相关视频
相关概念视频
01:09Colloidal precipitates
454
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
454
01:17Precipitation and Co-precipitation
1.6K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.6K
01:06Coagulation
252
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
252
03:22Colloids
17.2K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
17.2K