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4~20 nm介孔的天然多孔材料，是一种广泛应用于住宅的智能湿度控制材料。本研究通过将WSS浸泡在水溶液中，提高了WSS对水蒸气的吸附能力，增强了碱液改性WSS对VOC的吸附，提高了WSS的除臭效果。随着LiCl2和LiCl2用量的增加，吸水量增加，在相对湿度为95%时，当LiCl2的质量分数为20wt%时，吸水量为900 mg/g(负载量为120 mg/g)。然而，在高湿度条件下，可以观察到潮解物质从毛孔中洗脱。为了解决这一问题，通过从图像扫描仪获得的RGB颜色的变化来确定WSS中的最佳潮解量。最大水量。在95%相对湿度下，吸附量分别为330 mg/g(19.3 mg/g-LiCl2)和320 mg/g(36.3 mg/g-CaCl2)。重复试验2 0 0次以上，即每隔6h由2 3℃和75%RH逐步变化到4 0℃和2 8%RH，再用碱性溶液改变孔分布。特别是在2mol/L的氢氧化钠溶液中，由于形成了2.5 nm的小孔，甲苯的吸附增加了1.5倍。通过对湿法除臭效果的评价，发现氨、三甲胺、异戊酸和乙醛的吸附性能优于木炭。然而，硫化氢和甲硫醇等硫组分在WSS中的性能远远低于在木炭中的性能。此外，在25℃和50%RH的条件下，使用5g WSS在玻璃柱中对异戊酸(进口浓度为1ppm)进行了50天的连续脱臭。

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.