相关实验视频

Updated: Jul 12, 2025

Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow

Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow

Published on: April 18, 2019

避免令人遗憾的替代:新功能组的引入可以将PFAS从反复性转变为反应性吗?

Andrew P Folkerson¹, Stephanie R Schneider¹, Jonathan P D Abbatt¹

¹Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada.

Environmental science & technology

|October 25, 2023

概括

具有异原子连接的新型表面活性剂构成块显示了大气降解的潜力. 硫乙烯对象表现出最高的氧化速率常数,有证据表明MeFESOH的完全矿化.

科学领域:

环境化学环境化学
大气化学大气化学
化化合物化化合物

背景情况:

由于其稳定性,在消费产品中广泛使用和多基物质 (PFAS),从而使其在环境中持久.
开发具有增强可降解性的PFAS对于减轻环境污染至关重要.
表面活性剂结构中的异原子连接为降解提供了潜在的途径.

研究的目的:

为了研究新型表面活性剂构成块的大气命运.
为了确定气相OH氧化速率常数和识别降解产物.
评估矿化和良性降解途径的潜力.

主要方法:

合成新型表面活性剂的构建块与以太,和多碳链接.
大气室实验用于监测室温OH氧化速率常数和产品.
使用在线高分辨率化学电离质谱仪 (CIMS) 和离线UPLC-MS/MS进行分析.

主要成果:

硫乙烯的同源FESOH和MeFESOH具有最高的OH氧化速率常数 (k_FESOH = 2.82 × 10−12 cm3分子−1 s−1,k_MeFESOH = 2.17 × 10−12 cm3分子−1 s−1).
随着时间的推移,第一,第二和第三代氧化产物被确定.
终端降解产品包括FESOH和ProFdiEOH的超短 perfluoropropionic 酸 (PFPrA) 和短多乙烯酸;MeFESOH显示出完全矿化证据.

结论:

具有异原子连接的新型表面活性剂结构显示出不同的大气降解速率.
乙烯的结合似乎增强了对OH基的反应性.
对于MeFESOH的完全矿化潜力表明,对于未来的PFAS开发来说,它是一个有希望的,更温和的化学结构.

关键词:

在HFE中,HFE是HFE.PFAS大气退化大气退化作为PFAS的替代品,它可以替代.化为乙烯的含量是多少?多重化物多化物.

更多相关视频

Investigating Long-Distance Transport of Perfluoroalkyl Acids in Wheat via a Split-Root Exposure Technique

Investigating Long-Distance Transport of Perfluoroalkyl Acids in Wheat via a Split-Root Exposure Technique

Published on: September 28, 2022

Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia

Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia

Published on: October 10, 2013

相关概念视频

Radical Reactivity: Steric Effects

Radical Reactivity: Steric Effects

The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...

Protecting Groups for Aldehydes and Ketones: Introduction

Protecting Groups for Aldehydes and Ketones: Introduction

Protecting groups are compounds that can bind to a specific functional group in the presence of other functional groups to protect them from undesired chemical reactions. These compounds can selectively bind to particular functional groups and advance chemoselective reactions in polyfunctional systems (Figure 1). After the functional group has served its purpose, it is removed by reacting it with specific compounds.

Carboxylic Acids to Acid Chlorides

Carboxylic Acids to Acid Chlorides

Carboxylic acids react with SOCl2 or PCl5 to form acid chlorides. Amongst the carboxylic acid derivatives, acid chlorides are the most reactive and synthetically important derivatives. They are useful reagents for Friedel–Crafts acylation of some aromatic compounds.

Radical Reactivity: Electrophilic Radicals

Radical Reactivity: Electrophilic Radicals

Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...

Overview of Advanced Functional Groups

Overview of Advanced Functional Groups

Functional groups are groups of atoms with specific chemical properties that occur within organic molecules and are sometimes denoted as “R”. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
Types of Advanced Functional Groups
The table below summarizes some of the major functional groups in organic chemistry.

Radical Reactivity: Overview

Radical Reactivity: Overview

Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...