溶解有机物的一电子氧化剂诱导的转化:光学和抗氧化特性和分子
Xin Lei1, Yu Lei2, Qinglong Fu3
1School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, PR China; Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Faculty of Environmental Science & Engineering, Kunming University of Science & Technology, Kunming 650500, PR China.
Water research
|December 15, 2023
概括
不同的单电子氧化剂在高级氧化过程 (AOPs) 中独特地转化溶解有机物 (DOM). 硫酸盐激素造成了最大的碳减排,而化物激素最大的减少了电子捐赠能力,影响了水处理.
科学领域:
- 环境化学环境化学
- 水处理技术水处理技术
- 先进的氧化过程 (AOPs)
背景情况:
- 溶解有机物 (DOM) 通过作为激素清除剂,显著影响先进的氧化过程 (AOP).
- 激素对DOM的转化影响下游水处理和接收水的质量.
研究的目的:
- 为了比较由四种不同的单电子氧化剂诱导的DOM转化:硫酸盐 (SO4•−),化物 (Cl2•−),化物 (Br2•−) 和碳酸盐 (CO3•−) 基.
- 阐明特定的反应途径和由此产生的DOM特性变化.
主要方法:
- 通过监测溶解有机碳 (DOC),254 nm的紫外线吸收率 (UVA254) 和电子捐赠能力 (EDC) 来量化DOM转换.
- 使用富里埃变换红外光谱法 (FTIR) 分析功能组的变化.
- 使用高分辨率质谱法 (FTICR-MS) 进行分子变化的表征.
主要成果:
- 硫酸盐基 (SO4•−) 呈现出最大的DOC减少,归因于脱碳化.
- 基 (Cl2•−) 显示出最大的EDC减少,与转化为因的转化有关.
- 与SO4•−和Cl2•−相比,化物 (Br2•−) 和碳酸盐 (CO3•−) 基因在DOC,UVA254和EDC中引起的变化不那么显著.
- 含有较高芳香成分的DOM在DOC,UVA254和EDC中经历了较大的减少.
- 在所有激进治疗中,FTIR显示了基和基组的减少和碳基基组的增加.
- FTICR-MS表明,单电子氧化剂优先攻击不和碳骨,从而产生更和,更少芳香的产品.
- SO4•−由于其强烈的脱碳活性,显著降低了碳氧化状态和O/C比率.
结论:
- 独特的单电子氧化剂诱导DOM中的特定转换,影响其特性和反应性.
- 反应途径,如功能组的脱碳化和氧化,是氧化剂依赖的.
- 了解这些独特的DOM转换对于优化AOP和预测环境命运至关重要.
相关概念视频
01:20Radical Autoxidation
2.1K
The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
2.1K
01:17Oxidation of Phenols to Quinones
3.1K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
3.1K
01:19Oxidation and Reduction of Organic Molecules
6.6K
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
The removal of an electron from a molecule, results in a...
6.6K
02:37Oxidation of Alcohols
13.1K
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
13.1K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.2K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
10.2K
02:04Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids
5.9K
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
5.9K