Fan Wan, Zou Dong, Xu Jingrui, Chen Xianfu, Qiu Minghui, Fan Yiqun
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China.
Membranes (Basel). 2021 Sep 15;11(9):711. doi: 10.3390/membranes11090711.
Support is a necessary foundation for ceramic membranes to achieve high performance. Finding the optimum balance between high performance and low cost is still a significant challenge in the fabrication of ceramic supports. In this study, low-cost fly ash-based ceramic supports with enhanced performance were prepared by the addition of bauxite. The pore structure, mechanical strength, and shrinkage of fly ash/bauxite supports could be tuned by optimizing the bauxite content and sintering temperature. When the sintering temperature and bauxite content were controlled at 1300 °C and 40 wt%, respectively, the obtained membrane supports exhibited a high pure water permeance of approximately 5.36 m·m·h·bar and a high bending strength of approximately 69.6 MPa. At the same time, the optimized ceramic supports presented a typical mullite phase and excellent resistance to acid and alkali. This work provides a potential route for the preparation of ceramic membrane supports with characteristics of low cost and high performance.
支撑体是陶瓷膜实现高性能的必要基础。在陶瓷支撑体制备过程中，找到高性能与低成本之间的最佳平衡仍然是一项重大挑战。在本研究中，通过添加铝土矿制备了具有增强性能的低成本粉煤灰基陶瓷支撑体。粉煤灰/铝土矿支撑体的孔结构、机械强度和收缩率可通过优化铝土矿含量和烧结温度来调节。当烧结温度和铝土矿含量分别控制在1300℃和40wt%时，所制备的膜支撑体表现出约5.36 m·m·h·bar的高纯水通量和约69.6 MPa的高抗弯强度。同时，优化后的陶瓷支撑体呈现出典型的莫来石相以及优异的耐酸碱性能。这项工作为制备具有低成本和高性能特点的陶瓷膜支撑体提供了一条潜在途径。
