膜回收:探索臭氧作为的可行替代物,用于聚合物膜转化
Bianca Zappulla-Sabio1, Lide Jaurrieta1,2, Wolfgang Gernjak2,3
1LEQUiA, Institute of the Environment, University of Girona, Girona 17003, Spain.
概括
臭氧有效地将生命周期结束的反透膜转化为类似纳米过的膜,为氧化提供了一个可持续的替代方案. 这种聚合物修饰工艺提高了膜性能,减少了处理时间和化学剂量.
科学领域:
- 材料科学 材料科学 材料科学
- 环境化学环境化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 臭氧是一种强烈的氧化剂,用于材料降解和聚合物修饰.
- 氧化是一种常规的膜转换方法,但它耗时且需要高剂量.
- 生命周期结束的反透膜 (RO) 构成了回收的挑战.
研究的目的:
- 评价臭氧作为的可持续替代品,用于转换使用寿命结束的RO和纳米过 (NF) 膜.
- 描述臭氧处理膜在透性和盐排斥性方面的性能.
- 为了比较臭氧氧化的效率与氧化的效率,用于膜转化.
主要方法:
- 膜样本 (RO和NF) 暴露于高度 (20ppm) 和低度 (3ppm) 的臭氧.
- 分析了经过处理的膜的透性,盐排斥和表面特征.
- 臭氧处理的持续时间和剂量有所变化,以评估降解模式.
主要成果:
- 低臭氧暴露 (3 ppm) 选择性降解了聚胺层,将RO膜转化为类似NF的膜.
- 臭氧处理在显著更短的时间和更低的剂量中实现了与氧化相当的性能.
- 高水平的臭氧暴露 (20 ppm) 降解了聚胺和聚硫层,表明了聚背层回收的潜力.
- 由于气泡相互作用,臭氧诱导的降解是不齐全的,与的均攻击形成鲜明对比.
结论:
- 臭氧是的可行和更可持续的替代品,用于转化聚合物膜.
- 臭氧氧化为膜回收和重新利用提供了更快,更有效的方法.
- 这项研究为通过可控臭氧降解来进行膜组件的先进回收开辟了可能性.
相关概念视频
Oxidative Cleavage of Alkenes: Ozonolysis
12.7K
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
12.7K
Olefin Metathesis Polymerization: Overview
2.5K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
2.5K
Detergent Purification of Membrane Proteins
6.3K
Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
6.3K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)
3.1K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
3.1K
Ion Exchange
1.1K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
1.1K


