聚乙烯微塑料对Pb的影响 (II) 吸附到低质土壤 (Sierozem) 上及其机制
Yin Zhang1, Baowei Zhao1, Xin Zhang1
1School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, Gansu Province, P. R. China.
ACS omega
|July 29, 2024
概括
聚烯微塑料 (MPs) 降低了土壤的质量.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 环境化学环境化学
背景情况:
- 微塑料 (MP) 是新兴的环境污染物.
- 它们对土壤吸附重金属的能力的影响尚不清楚.
- 聚乙烯 (PS) MPs是常见的,其影响需要调查.
研究的目的:
- 研究聚钢 (PS) 微塑料 (MPs) 对 (Pb) 吸附在性土壤中的影响.
- 阐明MP引起的重金属吸附变化背后的机制.
- 评估MP粒子大小和度对Pb (II) 吸附的影响.
主要方法:
- 使用土壤 (S),土壤1毫米PS (S-PS1) 和土壤100微米PS (S-PS100) 进行了批量实验.
- 吸附动力学和异热量分别使用伪二阶模型和朗慕尔模型进行分析.
- 评估了颗粒大小,剂量,酸,pH值和竞争性金属离子 (Cu,Cd) 对Pb (II) 吸附的影响.
主要成果:
- Pb(II) 吸附平衡在12小时内达成,最好用伪二阶和朗慕尔模型来描述.
- 存在PS MPs显著降低了Pb (II) 吸附到土壤中的速度.
- 较大的PS颗粒大小,较高的PS剂量和增加的富尔维酸度抑制了吸附,而更高的pH值则增强了吸附.
- 在二元金属系统 (Cu-Pb,Cd-Pb) 中观察到具有竞争性的吸附.
- 吸附能力跟随了这一趋势:S > S-PS100 > S-PS1.
结论:
- 减少PS MPs的Pb (II) 吸附的主要机制是"稀释效应".
- 微塑料可以降低土壤的重金属吸附能力,可能增加重金属的流动性和污染风险.
- 了解MP-土壤-金属相互作用对于评估环境风险至关重要.
更多相关视频
相关概念视频
Microbial Bioremediation of Pesticides
85
Pesticides often feature structurally complex chemical architectures, incorporating halogen groups and multiple aromatic rings. These characteristics confer high chemical stability, rendering many pesticides resistant to natural degradation processes. This resistance poses significant environmental concerns, as persistent pesticide residues can accumulate in ecosystems and affect non-target organisms.Despite the inherent stability of many pesticides, certain microorganisms possess the metabolic...
85
Bioplastics
70
Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
70
Microbial Bioremediation of Plastics
131
Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...
131


