EDTA功能化松针生物炭 (EDTA@BC);是一种用于从水溶液中去除Ni(II的价值化生物材料
Aamir Rasheed1, Faiza Rasheed2, Waqas Khan Kayani3
1Faculty of Basic and Applied Sciences, Chemistry Department, University of Kotli, Kotli, Azad Jammu and Kashmir, Pakistan.
Microscopy research and technique
|May 27, 2024
概括
一种新型的乙烯基胺三酸 (EDTA) 功能化松针生物炭 (EDTA@BC) 有效地从水中去除Ni (II). 这种低成本的吸附剂显示出高效率和可重复使用性,为重金属整治提供了可持续的解决方案.
科学领域:
- 环境化学环境化学
- 材料科学 材料科学 材料科学
- 吸附科学 吸附科学
背景情况:
- 水溶液中的 (Ni) 污染对环境和健康构成重大风险.
- 开发具有成本效益和高效的吸附剂来去除重金属对于环境修复至关重要.
- 从农业废物中提取的生物炭为吸附剂开发提供了可持续的前体.
研究的目的:
- 为了制备和表征乙烯基二胺四酸 (EDTA) 功能化松针生物炭 (EDTA@BC).
- 评估EDTA@BC在各种条件下从水溶液中去除Ni (II) 的有效性.
- 调查吸附机制,再生能力和对Ni2去除的干扰效应.
主要方法:
- 松针通过活性化转化为生物炭.
- 乙烯基二胺四酸 (EDTA) 被移植到生物炭表面.
- 使用FTIR,SEM和EDX进行表征.
- 批量吸附实验以优化pH,剂量,体积和时间.
- 进行了吸附异温,动力学和热力学研究.
- 进行了再生和干扰离子研究.
主要成果:
- EDTA@BC 已成功合成和表征.
- 在优化条件下 (pH 6,100毫克剂量,4毫升体积,10分钟) 达到89%的最大Ni(II) 清除效率.
- 兰穆尔异热模型最好地描述了吸附过程 (qmax = 46.69 mg/g),遵循伪二次动力学.
- 吸附剂在三个再生周期后显示出合理的性能.
- 干扰离子 (Pb,Cr,Cu,Hg) 将吸附能力降低了68-78%.
结论:
- EDTA@BC是一种低成本,可持续的吸附剂,具有高效率,可以从水溶液中去除Ni (II).
- 功能化的生物炭具有良好的可重复使用性和在废水处理中实际应用的潜力.
- 该研究强调了松针的价值化,使其成为环境修复的有效材料.
更多相关视频
相关概念视频
01:19Masking and Demasking Agents
2.4K
EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on...
2.4K
00:56Extraction: Advanced Methods
446
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
446
01:03Precipitation Gravimetry
6.1K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
6.1K
01:18Effects of EDTA on End-Point Detection Methods
272
Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a...
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a...
272
01:26EDTA: Auxiliary Complexing Reagents
579
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...
579
01:30EDTA: Direct, Back-, and Displacement Titration
2.7K
The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
Direct titration involves buffering the metal ion solution to the desired pH and directly titrating with standard EDTA until the endpoint. The optimum pH ensures a large conditional formation constant of metal−EDTA and visibility of the free indicator color in the solution. In addition, auxiliary complexing reagents are used to prevent the precipitation of metal hydroxides...
Direct titration involves buffering the metal ion solution to the desired pH and directly titrating with standard EDTA until the endpoint. The optimum pH ensures a large conditional formation constant of metal−EDTA and visibility of the free indicator color in the solution. In addition, auxiliary complexing reagents are used to prevent the precipitation of metal hydroxides...
2.7K