非热等离子与液相UV/Fe-C相结合,用于清除甲
Caihong Qin1, Chaochao Jiang1, Rongrong Liu1
1School of Environment & Municipal Engineering, Xi'an University of Architecture & Technology, Xi'an, 710055, China.
Chemosphere
|June 25, 2023
概括
这项研究引入了一种新的液相催化方法,使用紫外线激活的铁载活性炭 (Fe-C) 来克服化挥发性有机化合物 (Cl-VOC) 在非热等离子体 (NTP) 降解过程中的催化剂中毒. 该方法显著提高了甲去除和矿化效率.
科学领域:
- 环境化学环境化学
- 血科学是一门科学课.
- 催化剂是一种催化剂.
背景情况:
- 催化剂中毒严重限制了非热等离子体 (NTP) 在降解化挥发性有机化合物 (Cl-VOC) 的有效性.
- 现有的气体固体催化系统因失效而受损,阻碍了实际应用.
研究的目的:
- 通过减轻催化剂失活,使用NTP开发一种稳定高效的Cl-VOC降解方法.
- 为了研究液相催化系统 (NTP + UV/Fe-C(L)) 对于二 (CB) 降解的有效性.
主要方法:
- 设计了一种新的NTP + UV/Fe-C(L) 系统,将带铁的活性碳 (Fe-C) 引入NTP反应堆下游的液相.
- 评估了 (CB) 降解效率和矿化.
- 分析了活性氧物种 (ROS) 和质量转移的作用.
- 研究了催化剂稳定性和降解途径.
主要成果:
- 该NTP + UV/Fe-C(L) 系统实现了94%的CB去除和68%的矿化效率,这与单一的NTP系统相比是显著的改善.
- 与气体固体系统相比,液相系统表现出更高的稳定性,这归因于溶解的中间体和减少了催化剂表面污垢.
- 反应性氧物种,特别是基基 (·OH) 和超氧化基 (·O2-),被确定为CB分解的关键贡献者.
- 在紫外线照射下对臭氧 (O3) 的Fe-C催化促进了ROS的产生,Fe-C使CB的质量转移系数提高了十倍.
结论:
- 液相催化方法有效地解决了Cl-VOCs在NTP氧化中的催化剂中毒问题.
- NTP + UV/Fe-C(L) 系统为有效和稳定降解危险的Cl-VOCs提供了一个有前途的战略.
- 了解降解途径和ROS机制为优化等离子体催化过程提供了洞察力.
相关概念视频
Hydrolysis of Chlorobenzene to Phenol: Dow Process
2.9K
Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is...
2.9K
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene
8.3K
Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
8.3K
Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle
711
Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
711
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
6.2K
Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
6.2K


