| TiO2掺杂用于调变α-Al2O3中空纤维膜烧结性能与表面性质 |
| TiO2 Doping of α-Al2O3 Hollow Fiber Membranes for Modulating the Sintering Behavior and Surface Property |
|
| 摘要: 利用相转化-高温烧结技术制备α-Al2O3中空纤维膜，系统研究了TiO2掺杂调变中空纤维膜的烧结性能与表面性质。结果表明，TiO2与α-Al2O3之间的固相反应能够促进中空纤维的烧结，当TiO2掺杂量（物质的量分数）为1%~2%时，其烧结温度可以降到1 400℃，且机械强度保持不变； TiO2掺杂增加了中空纤维表面的羟基活性位点浓度，从而有利于CHA分子筛膜的生长；使用物质的量分数1%~3% TiO2掺杂的α-Al2O3中空纤维制备出高质量CHA分子筛膜，其用于乙醇/水（9∶1，w/w）溶液渗透汽化脱水时的分离因子均超过10 000。 |
| 关键词: TiO2掺杂 α-Al2O3 中空纤维 CHA分子筛膜 |
| 基金项目: 国家自然科学基金（No.21776128，21878147）与国家重点研发计划（No.2018YFB1501701）资助。 |
| Abstract: α -Al2O3 ceramic hollow fiber membranes were prepared by a combined phase-inversion and sintering method. Effects of TiO2 doping on sintering behavior and surface property of hollow fiber membranes were investigated extensively. The results showed that a solid reaction between TiO2 and α-Al2O3 could promote the sintering of α - Al2O3 hollow fibers. When the doping TiO2 content (molar fraction) was 1% - 2%, the sintering temperature of hollow fibers could decrease to 1 400 ℃ while the mechanical strength was unchanged. The hydroxyl active sites on the surface of the fibers increased with the doping amount of TiO2, which was helpful to the growth of the CHA zeolite membrane on the prepared fibers. High-quality CHA zeolite membranes could be prepared on the α-Al2O3 hollow fibers doped with a molar fraction of 1%-3% TiO2, which showed high separation factors above 10 000 for pervaporation dehydration of ethanol/water (9∶1, w/w) mixture. |
| Keywords: TiO2 doping α-Al2O3 hollow fiber CHA zeolite membrane |
| 投稿时间：2021-03-28 修订日期：2021-11-06 |
| 摘要点击次数: 1656 |
| 全文下载次数: 491 |
| 刘华,高雪超,彭莉,顾学红.TiO2掺杂用于调变α-Al2O3中空纤维膜烧结性能与表面性质[J].无机化学学报,2022,38(1):14-20. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
