Flexible ceramic nanofibers are highly desired due to their potential applications in free-standing catalyst supports, fine particulate filters and flexible electronic devices. In this work, robust SiOC fibrous membranes composed of randomly oriented nanofibers with an average diameter of 550 nm were fabricated by a combination of electrospinning and post heat-treatment process. The mechanical properties of the as-prepared membranes were enhanced significantly through in situ embedding of palladium nanoparticles into the SiOC fibers. The optimized palladium-doped SiOC fibrous membrane demonstrated a low flexural modulus of 7.79 kPa and a high tensile strength of 33.2 MPa. Reduced flaw size, initiation of nanocracks and pinning effect were proposed to explain the enhancement mechanism. Furthermore, the flexible SiOC membrane with excellent corrosion resistance exhibits a high filtration efficiency of 99.6% when the membrane weight is 4.8 g m −2 , suggesting efficient filtration applications in harsh environments. This work also provides a feasible strategy for the design and fabrication of the flexible amorphous ceramic fiber membranes for various applications.
Ji Jiankun,Gu Yarong,Zhang Jianning,Yu Chongwen,Hu Xiao,Bao Yueping,Song Yujie
A major challenge is to construct ceramic membranes with tunable structures and functions for water treatment. Herein, a novel corrosion-resistant polymer-derived silicon oxycarbide (SiOC) ceramic membrane with designed architectures was fabricated by a phase separation method and was applied in organic removal via adsorption and oxidation for the first time. The pore structure of the as-prepared SiOC ceramic membranes was well controlled by changing the sintering temperature and polydimethylsiloxane content, leading to a pore size of 0.84–1.62 μm and porosity of 25.0–43.8%. Corrosion resistance test results showed that the SiOC membranes sustained minimal damage during 24 h exposure to high-intensity acid–base conditions, which could be attributed to the chemical inertness of SiOC. With rhodamine 6G (R6G) as the model pollutant, the SiOC membrane demonstrated an initial effective removal rate of 99% via adsorption; however, the removal rate decreased as the system approached adsorption saturation. When peroxymonosulfate was added into the system, efficient and continuous degradation of R6G was observed throughout the entire period, indicating the potential of the as-prepared SiOC membrane in oxidation-related processes. Thus, this work provides new insights into the construction of novel polymer-derived ceramic membranes with well-defined structures and functions.
危险品化学品经营许可证（带存储）