在单一,二进制和三进制系统下与微塑料共存时,生物炭对Cd,Ni和Cu的竞争性吸附行为和机制
Zhuowen Meng1, Jingwei Wu1, Shuang Huang1
1State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, China.
The Science of the total environment
|December 23, 2023
概括
微塑料对生物炭产生负面影响.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 材料科学 材料科学 材料科学
背景情况:
- 微塑料是普遍存在的环境污染物.
- 生物炭是重金属修复的一个有前途的材料.
- 微塑料和土壤衰老对生物炭的有效性的综合影响尚不清楚.
研究的目的:
- 研究微塑料和土壤老化对生物炭重金属吸附的影响.
- 阐明微塑料和生物炭之间对 (Cd), (Ni) 和铜 (Cu) 的竞争吸附机制.
- 评估微塑料颗粒大小和衰老对生物炭修复潜力的影响.
主要方法:
- 吸附实验是使用微塑料,生物炭及其组合在单一,二元和三元系统中进行的.
- 对Cd,Ni和Cu的重金属吸附能力和机制进行了分析.
- 评估了干湿和冷解衰老对微塑料和生物炭特性的影响.
主要成果:
- 微塑料对重金属的吸附能力按照Ni > Cd > Cu的顺序进行,并且随着颗粒体大小的减少而增加.
- 微塑料吸附被干湿和冷解老化增强.
- 与微塑料的共存显著减少了生物炭的重金属吸附,特别是Cd和Cu,较小的微塑料尺寸加剧了这种效应.
- 微塑料的存在减少了生物炭矿物质机制对重金属吸附的贡献.
- 老化进一步降低了生物炭矿物吸附机制的有效性.
结论:
- 微塑料干扰并降低生物炭在吸附重金属方面的有效性.
- 微塑料的存在,特别是较小的颗粒,对基于生物炭的重金属整治构成了重大挑战.
- 未来生物炭用于环境修复的应用必须考虑微塑料污染和土壤老化的缓解效应.
相关概念视频
Bioremediation
18.5K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
18.5K
Complexation Equilibria: The Chelate Effect
518
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
518
Colloidal precipitates
585
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...
585


