热水解诱导的污泥中的分子转化:对光化学反应和溶解抗生素光散射的影响
Haifeng Wen1, Xin Wang1, Xinchao Zhang1
1School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China.
Journal of hazardous materials
|March 22, 2025
概括
在150°C的热水解优化了污水污泥溶解有机物 (DOM) 以加强抗生素光降解. 这种关键温度促进DOM分子变化,促进反应性氧物种 (ROS) 生成,改善污染物去除.
科学领域:
- 环境化学环境化学
- 水处理技术 水处理技术
- 摄影化学的使用.
背景情况:
- 热水解 (TH) 有效地使污水污泥溶解,但温度对溶解有机物 (DOM) 性能和随后的光化学活性的影响尚不清楚.
- 了解TH期间DOM的分子演变对于优化处理过程和预测污染物命运至关重要.
研究的目的:
- 在热水解 (90-220°C) 过程中研究泥DOM的温度依赖分子演变.
- 评估这些DOM变化对其光化学特性和抗生素光降解效率的影响.
- 确定最佳的TH条件,以促进废水中抗生素的光降解.
主要方法:
- 使用里埃变换离子循环子共振质谱 (FT-ICR MS) 和元素导热 (ETC) 分析.
- 在多种TH温度范围内,DOM的结构演变,氧化还原特性和活性氧物种 (ROS) 生成的特征.
- 在不同的TH条件下量化了硫甲醇的光降解率.
主要成果:
- 150°C被确定为最佳光化学活性的关键值,其特征是蛋白质物质的脱碳和脱.
- 在150°C时,DOM表现出增强的电子捐赠能力,增加激发三元状态 (3DOM*) 的产生,以及显著更高的ROS (1O2和O2−) 生产.
- 硫甲醇光降解在150°C显著改善 (kobs=0.2587h-1),而低于150°C的温度显示出有限的活性,而高于180°C的温度显示出由于光屏效应的反应性降低.
结论:
- 优化热水解温度,特别是在150°C左右,是最大限度地提高DOM在抗生素降解中的光化学潜力的关键.
- DOM的分子结构,特别是蛋白质和类物质之间的平衡,决定了其光化学反应能力和ROS生成效率.
- 这项研究为定制污泥处理工艺提供了理论基础,以增强通过光降解去除微污染物的过程.
更多相关视频
08:30A Complete Method for Evaluating the Performance of Photocatalysts for the Degradation of Antibiotics in Environmental Remediation
Published on: October 6, 2022
2.1K
15:19Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
9.6K
相关概念视频
01:15Phase I Reactions: Hydrolytic Reactions
57
Hydrolysis, a cornerstone of phase I biotransformation reactions, uses water to cleave chemical bonds. This process is pivotal in drug metabolism, generating more polar metabolites that can be easily excreted.
An important hydrolytic reaction is ester hydrolysis. Ester bonds, often found in prodrugs, are broken down, increasing the solubility of drugs like aspirin and lidocaine for more straightforward elimination. Amide hydrolysis is another critical reaction, targeting amide bonds prevalent...
An important hydrolytic reaction is ester hydrolysis. Ester bonds, often found in prodrugs, are broken down, increasing the solubility of drugs like aspirin and lidocaine for more straightforward elimination. Amide hydrolysis is another critical reaction, targeting amide bonds prevalent...
57
01:26Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
1.8K
Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
1.8K
04:01Factors Affecting Solubility
32.9K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
32.9K
00:46Bioremediation
18.1K
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.
18.1K