Investigation of CO2-Sorption Characteristics of Readily Available Solid Materials for Indoor Direct Air Capturing

IF 4.3 2区 环境科学与生态学 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Indoor air Pub Date : 2023-07-14 DOI:10.1155/2023/8821044
Lukas Baus, S. Nehr, Nobutaka Maeda
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Abstract

Direct air capturing (DAC) is an energy demanding process for CO2-removal from air. Ongoing research focuses on the potential of indoor air as DAC-feed to profit from currently unused energetic synergies between DAC and the built environment. In this work, we investigated the performance of three different readily available, solid DAC-adsorbers under typical indoor environmental conditions of 16-25°C, 25-60% relative humidity (RH), and CO2-concentrations of less than 800 ppm above atmospheric concentrations. The measured mass-specific CO2-adsorption capacities of K2CO3-impregnated activated carbon, polyethylenimine-snow (PEI-snow), and polyethylenimine (PEI) on silica amount to 6.5 ± 0.3   mg   g − 1 , 52.9 ± 4.9   mg   g − 1 , and 56.9 ± 4.2   mg   g − 1 , respectively. Among the three investigated adsorber materials, PEI on silica is the most promising candidate for DAC-applications as its synthesis is rather simple, the CO2-desorption is feasible at moderate conditions of about 80°C at 100 mbar, and the competing co-adsorption of water does not strongly affect the CO2-adsorption under the investigated experimental conditions.
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室内直接捕风固体材料对co2吸附特性的研究
直接空气捕获(DAC)是从空气中去除二氧化碳的耗能过程。正在进行的研究侧重于室内空气作为DAC馈源的潜力,以从DAC和建筑环境之间目前未使用的能量协同效应中获利。在这项工作中,我们研究了三种不同的现成的固体dac吸附剂在典型的室内环境条件下的性能:16-25°C, 25-60%相对湿度(RH), co2浓度低于大气浓度800ppm。k2co3浸渍活性炭、聚乙烯亚胺-雪(PEI-snow)和聚乙烯亚胺(PEI)在二氧化硅上的吸附量分别为6.5±0.3 mg g−1、52.9±4.9 mg g−1和56.9±4.2 mg g−1。在所研究的三种吸附材料中,二氧化硅上的PEI是最有希望应用于dac的材料,因为它的合成相当简单,在大约80°C和100 mbar的中等条件下co2解吸是可行的,并且在所研究的实验条件下,水的竞争共吸附对co2的吸附没有强烈的影响。
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来源期刊
Indoor air
Indoor air 环境科学-工程:环境
CiteScore
10.80
自引率
10.30%
发文量
175
审稿时长
3 months
期刊介绍: The quality of the environment within buildings is a topic of major importance for public health. Indoor Air provides a location for reporting original research results in the broad area defined by the indoor environment of non-industrial buildings. An international journal with multidisciplinary content, Indoor Air publishes papers reflecting the broad categories of interest in this field: health effects; thermal comfort; monitoring and modelling; source characterization; ventilation and other environmental control techniques. The research results present the basic information to allow designers, building owners, and operators to provide a healthy and comfortable environment for building occupants, as well as giving medical practitioners information on how to deal with illnesses related to the indoor environment.
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