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

Wakkanai硅质页岩（WSS）是一种具有4 ~ 20nm介孔的天然多孔材料，被广泛用于房屋的智能湿度控制材料。在本研究中，研究了将WSS浸泡在潮解溶液中对水蒸气吸附能力的提高、碱性溶液改性WSS对VOC吸附的增强以及对异味的除臭效果。将潮解材料浸渍在LiC1和CaCl_2溶液中制备WSS。吸附量随LiC1和CaCl_2的增加而增加，在95%的相对湿度下，20%的LiC1溶液（负载量为120 mg/g）的吸附量为900 mg/g。然而，在高湿条件下，观察到潮解物质从孔隙中洗脱。为了解决这一问题，通过图像扫描仪获得的RGB颜色的变化来确定WSS中潮解的最佳量。最大的水量。在95% RH条件下，吸附量分别为330 mg/g （19.3mg/g- licl）和320 mg/g （36.3mg/g- cacl_2）。重复测试200次以上，从23℃、75% RH逐步变化到40℃、28% RH，每隔6小时可获得稳定的水吸附/解吸能力。碱性溶液改变了WSS的孔隙分布。特别是在2mol/l NaOH溶液处理下，由于形成2.5nm的孔，甲苯吸附量增加了1.5倍。通过对WSS除臭效果的评价发现，与木炭相比，WSS对氨、三甲胺、异戊酸和乙醛的吸附性能较好。而硫化氢、甲基硫醇等硫组分在WSS中的性能远低于木炭。此外，在25℃、50% RH条件下，用5g WSS在玻璃柱中连续脱臭50天，验证了异戊酸（进口浓度为1ppm）的脱臭效果。

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.