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| 硅酸铁调湿材料的微观结构与吸放湿性能分析 |
| Microstructure and moisture absorption/desorption characteristics of iron silicate humidity controlling materials |
| 投稿时间：2016-09-29 |
| DOI： |
| 中文关键词: 调湿材料 硅酸铁 微观结构 吸放湿性能 含湿量 |
| 英文关键词: humidity controlling material iron silicate microstructure moisture absorption and desorption characteristics moisture content |
| 基金项目:湖北省教育厅科学技术研究计划重点项目(D20151101). |
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| 中文摘要: |
| 以硅酸钠和氯化铁溶液为原料制备硅酸铁调湿材料,采用FTIR、XRD、SEM、BET等技术对所制调湿材料进行表征,并测定其吸放湿性能。结果表明,所制硅酸铁调湿材料呈无定形结构,其比表面积和孔容较大、平均孔径较小；硅酸钠的模数影响调湿材料在低湿环境下的吸湿性能,由模数为1的硅酸钠所制硅酸铁调湿材料具有较好的自调湿性能；硅酸铁调湿材料在20 ℃和相对湿度为84%的环境下吸湿容量高达120%,吸湿平衡时间约为240 h；在相对湿度为84%下达到吸湿平衡的材料在相对湿度为32%的环境下放湿90 h左右可达到放湿平衡,在50 ℃恒温干燥放湿5 h可实现完全放湿；所制硅酸铁调湿材料具有吸湿量大和吸放湿速率快的特性,其性能明显优于硅胶和分子筛等传统的调湿材料。 |
| 英文摘要: |
| With sodium silicate and ferric chloride solution as the raw materials, iron silicate humidity controlling materials were prepared and characterized by FTIR, XRD, SEM and BET.At the same time,the capability of moisture absorption and desorption were tested. The results show that iron silicate humidity controlling materials have amorphous structure with reletively larger surface area and pore volume, but smaller average pore size.The modulus of sodium silicate have effect on moisture absorption characteristics of humidity controlling materials at reletively low humidity, and the iron silicate humidity controlling materials prepared by modulus of sodium silicate at 1 have better self-adjustment humidity performance. The moisture absorption capacity and moisture absorption equilibrium period at 20 ℃ and 84% relative humidity can be up to 120% and 240 h, respectively. When iron silicate humidity controlling materials reach moisture equilibrium under 84% relative humidity, it takes 90 h for the materials to reach the moisture desorption equilibrium under 32% relative humidity, while it only needs 5 h to achieve the complete moisture desorption under constant temperature drying at 50 ℃.The iron silicate humidity controlling materials have larger moisture absorption capacity and faster moisture absorption and desorption speed, which is superior to the traditional humidity controlling materials of silica gel and molecular sieves. |
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