Department of Chemical & Biochemical Engineering, Missouri University of Science and Technology, Rolla, MO, USA.
Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO, USA.
Indoor Air. 2017 Nov;27(6):1213-1223. doi: 10.1111/ina.12386. Epub 2017 May 2.
In this study, we evaluated solid sorbents for their ability to passively control indoor CO concentration in buildings or rooms with cyclic occupancy (eg, offices, bedrooms). Silica supported amines were identified as suitable candidates and systematically evaluated in the removal of CO from indoor air by equilibrium and dynamic techniques. In particular, sorbents with various amine loadings were synthesized using tetraethylenepentamine (TEPA), poly(ethyleneimine) (PEI) and a silane coupling agent 3-aminopropyltriethoxysilane (APS). TGA analysis indicates that TEPA impregnated silica not only displays a relatively high adsorption capacity when exposed to ppm level CO concentrations, but also is capable of desorbing the majority of CO by air flow (eg, by concentration gradient). In 10 L flow-through chamber experiments, TEPA-based sorbents reduced outlet CO by up to 5% at 50% RH and up to 93% of CO adsorbed over 8 hours was desorbed within 16 hours. In 8 m flow-through chamber experiments, 18 g of the sorbent powder spread over a 2 m area removed approximately 8% of CO injected. By extrapolating these results to real buildings, we estimate that meaningful reductions in the CO can be achieved, which may help reduce energy requirements for ventilation and/or improve air quality.
在这项研究中，我们评估了固体吸附剂被动控制具有循环占用（例如，办公室、卧室）的建筑物或房间内 CO 浓度的能力。我们确定了负载胺的二氧化硅是合适的候选材料，并通过平衡和动态技术系统地评估了其从室内空气中去除 CO 的能力。具体而言，使用四乙烯五胺（TEPA）、聚乙烯亚胺（PEI）和硅烷偶联剂 3-氨丙基三乙氧基硅烷（APS）合成了具有不同胺负载的吸附剂。TGA 分析表明，浸渍在二氧化硅上的 TEPA 不仅在暴露于 ppm 级 CO 浓度时显示出较高的吸附能力，而且还能够通过气流（例如通过浓度梯度）解吸大部分 CO。在 10 L 流量通过室实验中，基于 TEPA 的吸附剂可将 50% RH 下的出口 CO 降低高达 5%，并且在 8 小时内吸附的高达 93%的 CO 在 16 小时内解吸。在 8 m 流量通过室实验中，散布在 2 m 区域上的 18 g 吸附剂粉末可去除约 8%注入的 CO。通过将这些结果外推到实际建筑物中，我们估计可以实现 CO 的显著减少，这可能有助于减少通风的能源需求和/或改善空气质量。
