铁凝固剂在电离辐射过程中调节反应物种,用于增强双A的降解
1Laboratory of Environmental Technology, INET, Tsinghua University, Beijing, 100084, PR China.
Chemosphere
|November 17, 2024
概括
剩余的铁凝固剂通过促进污染物降解,显著增强电子束废水处理. 这种由现场芬顿反应驱动的协同作用改善了整体水质,并减少了所需的辐射剂量.
科学领域:
- 环境化学环境化学
- 辐射化学 辐射化学
- 水处理技术水处理技术
背景情况:
- 工业废水处理通常将花与电子束 (EB) 辐射相结合,以满足排放标准.
- 含铁的凝固剂通常用于花,在水中留下残留量.
- 这些残留凝固剂对EB辐射污染物降解效率的影响尚未完全理解.
研究的目的:
- 研究残留铁凝固剂在工业废水电子束辐射过程中对污染物降解的影响.
- 阐明铁凝固剂增强电离辐射过程的机制.
- 评估利用残留凝固剂的潜力,以提高EB废水处理效率.
主要方法:
- 在含有不同度铁化物 (FeCl3) 的水溶液中对双A (BPA) 进行电子束辐射.
- 对BPA降解和总有机碳 (TOC) 去除效率的分析.
- 使用机理学研究研究反应物种 (例如,基,化电子) 和反应机制的研究.
- 评估pH对降解效率和铁物种化的影响.
主要成果:
- 100微米FeCl3的存在使50毫克/升BPA去除的吸收剂量从5kGy降低到2.5kGy.
- 在广泛的pH范围 (3.0-10.0) 中,FeCl3剂量提高了BPA降解和TOC去除效率.
- 机理学研究表明,残留铁通过促进现场芬顿反应来增强降解,在酸性到中性条件下 (pH3.0-6.0) 产生更多的基基 (•OH).
结论:
- 剩余的铁凝固剂在电子束处理过程中显著增强了污染物的降解和矿化.
- 这种协同效应归因于通过涉及Fe (II) /Fe (III) 循环的芬顿式反应在现场生成基.
- 这项研究突出了优化EB废水处理的潜力,通过利用先前的化步骤中的残留铁凝固剂.
更多相关视频
08:13Using Magnetometry to Monitor Cellular Incorporation and Subsequent Biodegradation of Chemically Synthetized Iron Oxide Nanoparticles
Published on: February 27, 2021
4.5K
08:34A Dual-Functional Electroactive Filter Towards Simultaneously SbIII Oxidation and Sequestration
Published on: December 5, 2019
5.5K
相关概念视频
Coagulation
273
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
273
Radical Reactivity: Concentration Effects
1.5K
In a radical reaction, the concentration of starting materials governs the selectivity of a radical. For example, the reaction between an alkyl halide and an alkene, in the presence of tin hydride and AIBN, begins with the generation of a tin radical. The generated radical then abstracts halogen from the alkyl halide, producing an alkyl radical. This alkyl radical can either react with tin hydride, yielding an alkane, or add to an alkene, generating a nitrile-stabilized radical, eventually...
1.5K
Bioremediation
18.2K
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.
18.2K
EDTA: Auxiliary Complexing Reagents
555
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
555
Radical 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
