使用tms-EDTA功能化的Ti3去除工业废水中的离子:实验和统计物理建模
Syed Asad Raza Kazmi1, Syed Muhammad Husnain2, Abdul Rehman Khan1
1Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences, P. O. Nilore, Islamabad 45650, Pakistan.
Journal of hazardous materials
|March 1, 2025
概括
表面修改的Ti3C2Tx MXene (EDTA@MXene) 有效地从水中去除重金属. 这种增强的吸附剂显示了工业废水处理的高容量和可重复使用性.
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 化学 化学
背景情况:
- 水中的重金属污染对环境和健康构成重大风险.
- 开发高效且可重复使用的吸附剂对于水资源整治至关重要.
研究的目的:
- 用tms-EDTA研究Ti3C2Tx MXene的表面修饰,以创建双价重金属的高效吸附剂.
- 评估修改后的MXene用于水处理的吸附性能,机制和可重复使用性.
主要方法:
- 用tms-EDTA.进行Ti3C2Tx MXene的表面修饰.
- 使用各种双价重金属 (Cd2+,Cu2+,Ni2+,Pb2+,Zn2+) 的吸附实验,使用Ni2+作为模型吸附剂.
- 动力学和同热学研究 (Langmuir, Freundlich),先进的统计物理模型.
- 可重复使用性测试和在工业废水中的应用.
主要成果:
- 与原始MXene相比,EDTA@MXene具有显著增强的吸附能力.
- 尼2+的最大吸附能力达到249.5mg/g,平衡在30分钟内达到.
- 吸附遵循伪二次动力学,并配合兰迈尔/弗朗德利希等温;Ni2+吸附是内热的,是由物理相互作用驱动的.
- EDTA@MXene在处理电废水方面表现出卓越的可重复使用性 (>5个循环后80%) 和有效性.
结论:
- EDTA@MXene是一种高效且可重复使用的吸附剂,用于从污染水中去除双价重金属酸.
- 该研究强调了改性MXene材料在工业废水处理应用中的潜力.
相关概念视频
01:19Masking and Demasking Agents
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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...
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01:30EDTA: Direct, Back-, and Displacement Titration
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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...
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01:26EDTA: Auxiliary Complexing Reagents
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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...
525
01:23EDTA: Indirect and Alkalimetric Titration
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Unlike direct titration, back-titration, and displacement titration, indirect titration is an EDTA titration method for quantifying anions. In the indirect titration method, anions are precipitated as their insoluble salts with excess metal ions. The filtrate containing the excess metal ions is directly titrated with standard EDTA until the endpoint is achieved. Another approach involves extracting the metal ion and back-titrating with standard EDTA to obtain the endpoint. In this way, the...
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01:18Effects of EDTA on End-Point Detection Methods
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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...
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00:56Extraction: Advanced Methods
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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...
398