基于贝的层次微型/半孔碳作为有效的纳米吸收剂用于CO2/CH4分离:实验和DFT建模
Hosna Hosseinzadeh Beiragh1, Mohammad Samipourgiri2, Alimorad Rashidi3
1Department of Chemical Engineering, North Tehran Branch, Islamic Azad University, Tehran, Iran.
Scientific reports
|August 10, 2024
概括
研究人员从贝中开发了纳米孔状碳吸附剂,用于选择性地分离二氧化碳 (CO2) 和甲 (CH4). 性能最好的材料显示出高的二氧化碳吸附能力和选择性,为气体混合物提供了可持续的解决方案.
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:
- 开发用于选择性气体分离的高效吸附剂对于环境修复和资源利用至关重要.
- 像贝这样的废物材料为合成先进的多孔材料提供了可持续和丰富的前体.
- 现有的CO2/CH4分离方法往往缺乏选择性或经济可行性.
研究的目的:
- 从贝 (CSs) 中合成和表征纳米孔状碳纳米吸附剂,用于选择性CO2/CH4吸附.
- 为了优化合成参数 (激活时间,温度,KOH比) 以提高吸附性能.
- 通过实验和理论方法研究吸附能力,选择性和潜在机制.
主要方法:
- 使用KOH激活贝,以产生纳米孔状碳材料.
- 材料使用XRD,FT-IR,SEM,拉曼,TGA和BET分析进行了表征.
- 在不同压力和温度下评估了CO2/CH4吸附和选择性;采用了DFT计算.
主要成果:
- 优化的CS-2-2-900样本表现出高的CO2吸附能力7.217 mmol/g在10巴和25°C.
- 这个样本具有很大的表面积 (914.85 m2/g),孔径量 (1.1 cm3/g) 和平均孔径 (4.82 nm).
- 功能化CS-2-2-900 (FCS-2-2-900) 显示CO2对CH4的选择性为18.99,DFT证实了位的作用.
结论:
- 从贝中提取的纳米孔状碳是有效和可持续的吸附剂,用于从CO2/CH4混合物中选择性捕获CO2.
- 与其他废物来源的吸附剂相比,合成材料表现出优越的性能.
- 这些功能化的多孔纳米碳素为气体分离应用提供了一个有希望的,具有成本效益的解决方案.
更多相关视频
07:23Experimental Study of the Relationship Between Particle Size and Methane Sorption Capacity in Shale
Published on: August 2, 2018
7.5K
10:44Preparation of Biomass-based Mesoporous Carbon with Higher Nitrogen-/Oxygen-chelating Adsorption for CuII Through Microwave Pre-Pyrolysis
Published on: February 12, 2019
9.9K
相关概念视频
01:28Adsorption of Gases on Solids
297
Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...
297
01:29Adsorption Isotherms I
255
Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed...
255
01:25Adsorption Isotherms II
146
Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...
146