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Study on the Reduction Technology of Environmental Load for Human Living and Life by using Wakkanai Siliceous Shale in Hokkaido

利用北海道稚内硅质页岩降低人类生活和生活环境负荷技术研究

基本信息

批准号：
18310065
负责人：
NAGANO Katsunori
金额：
$ 10.82万
依托单位：
Hokkaido University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

Wakkanai Siliceous Shale (WSS), a natural porous material with 4 to 20 nm of meso-pore, is widely used as an intelligent humidity control material for housing. In this study, an improvement of water vapor adsorption ability by soaking WSS in deliquescent solution, enhancement of VOC adsorption of WSS modified by alkaline solution, and deodorization effect of odor has been investigated.The preparation of WSS containing deliquescent material was performed by the impregnation into the LiC1 and CaCl_2 solution. The amount of water adsorption increased with increasing LiC1 and CaCl_2, and it showed 900 mg/g at 95 %RH with 20 wt % of LiC1-solution (supported a mount of LiC1 was 120 mg/g). However, at high humidity condition, the elution of deliquescent materials from the pore was observed. To solve this problem, an optimal amount of deliquescent in WSS was defined by the change of RGB color obtained from the image scanner. The maximum amount of water. Adsorption is 330 mg/g (19.3mg/g-LiCl) and 320 mg/g (36.3mg/g-CaCl_2) at 95 %RH. The stable ability of the water adsorption/desorption can be achieved over 200 times of repetition test, which is stepwise change from 23 ℃ and 75 %RH to 40 ℃ and 28 %RH in every 6 hours interval.The pore distribution of WSS was changed by using alkaline solution. Particularly, in the treatment of 2mol/l of NaOH solution, toluene adsorption increases 1.5 times, because of making of 2.5nm pore.From the evaluation of the odor reduction with WSS, it was found that the ammonia, trimetylamine, isovaleric acid and acetaldehyde showed good adsorption performance compared to charcoal. However, the performance of sulfur component such as hydrogen sulfide and methyl mercaptan in WSS were much lower than it in charcoal. In addition, the effect of continuous deodorization for isovaleric acid (1 ppm of inlet concentration) was confirmed over 50 days by using 5g of WSS in glass column at 25 ℃ and 50 %RH.

稚内硅质页岩（WSS）是一种具有4至20纳米介孔的天然多孔材料，被广泛用作住宅智能调湿材料。本研究主要考察了通过潮解溶液浸泡WSS提高水蒸气吸附能力、碱性溶液改性WSS增强VOC吸附能力以及除臭效果。通过浸渍LiCl和CaCl_2溶液制备含潮解材料的WSS。水吸附量随着LiCl和CaCl_2的增加而增加，在20wt%的LiCl溶液（负载量为120mg/g）的95%RH下，水吸附量为900mg/g。然而，在高湿度条件下，观察到潮解物质从孔中洗脱。为了解决这个问题，WSS 中的最佳潮解量是通过从图像扫描仪获得的 RGB 颜色的变化来定义的。最大水量。 95 %RH 时，吸附量为 330 mg/g (19.3mg/g-LiCl) 和 320 mg/g (36.3mg/g-CaCl_2)。重复测试200次以上，可实现稳定的吸/解吸水能力，每6小时从23℃、75%RH逐步变化到40℃、28%RH。使用碱性溶液改变WSS的孔径分布。特别是，在处理2mol/l的NaOH溶液时，由于制作了2.5nm的孔，甲苯的吸附量增加了1.5倍。通过WSS对气味减少的评价，发现与木炭相比，氨、三甲基胺、异戊酸和乙醛表现出良好的吸附性能。然而，WSS中的硫化氢、甲硫醇等硫成分的性能远低于木炭中的性能。另外，在玻璃柱中使用5g WSS，在25℃、50%RH下，经过50天的持续脱臭效果，确认了异戊酸（入口浓度1ppm）的效果。