基托桑基泡复合材料用于六价修复:微纤维素和交联剂含量的作用
Marcelo Bruno de Oliveira Silva1, Talles Barcelos da Costa1, Paulo Henrique Camani1
1Center for Engineering, Modelling and Applied Social Sciences (CECS), Federal University of ABC (UFABC), Santo André, São Paulo, Brazil.
International journal of biological macromolecules
|February 29, 2024
概括
这项研究开发了基托基泡,以从水中去除有毒的六价 (Cr6+). 增强的泡显示出更好的机械强度和高效的Cr6+吸附,提供可持续的水处理解决方案.
科学领域:
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 六价 (Cr6+) 是一种有毒的金属离子,由于其持久性和生物积累,它对健康构成重大风险.
- 基于高度多孔的多糖体材料提供一种可生物降解和低毒性的方法,可以有效地从水中去除金属离子.
- 基托是一种可生物降解的多糖,是开发功能吸附剂的有前途的基材.
研究的目的:
- 为了研究微纤维素和谷物化度对Cr6+去除的基托泡的吸附能力和机械性能的影响.
- 为了优化桑泡配方,提高结构完整性和高效的六价吸附.
- 为了评估开发的Cr6+离子的基托泡的吸附行为和最大吸附能力.
主要方法:
- 制造具有不同度的微纤维素 (0.5-1.5%) 和甲 (1-3%) 的奇托桑泡.
- 泡结构的特征,机械性能 (最大应力,Young的模量) 和Cr6+吸附能力.
- 在不同条件下进行的吸附研究,数据与异温模型 (例如Sips模型) 相匹配.
主要成果:
- 微纤维素的添加显著增强了泡的机械性能,最大应力增加了高达180%,Young的模量增加了高达135%.
- 由于氨基基组的占用,Cr6+吸附能力随着微纤维素和甲含量增加而降低.
- 开发的奇托桑泡表现出有利的Cr6+吸附行为,在pH值为4.0和25°C时最大容量约为1.4 mmol·g-1 ,Sips模型最能描述.
结论:
- 桑-微纤维素泡具有更好的结构完整性和机械强度,使其适用于水处理应用.
- 尽管吸收能力因添加剂度较高而下降,但泡仍然有效地从污染水中去除六价.
- 这些增强的酸盐泡为处理受有毒Cr6+离子污染的水提供了可行,环保和经济高效的替代方案.
相关概念视频
02:04Fixing Double-strand Breaks
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
02:04Fixing Double-strand Breaks
The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
01:27Fractures: Bone Repair
Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the procedure...
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the procedure...
01:22Fiber Reinforced Concrete
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
01:31Plasticizers
Water-reducers, or plasticizers, are chemical admixtures used in concrete to improve strength and workability. These additives reduce the water-cement ratio without compromising workability, lower the cement content while maintaining the same workability, or increase workability to assist concrete placement in inaccessible areas.
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
Plasticizers function by using surface-active agents to create repulsive electrostatic forces between cement particles. This dispersion enhances the concrete's...
01:30Superplasticizers
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...