High-performance CrN tight ultrafiltration membranes prepared by in situ gas–solid catalytic reaction

Materials & Design

Qingkun He¹  Guopeng Zhao¹  Tingting Liu²  Kun Xie²  Yanpeng Xue³  Qi Yan⁴  Jinquan Sun⁴  Xiaohong Liu⁵ 

[1] Corresponding authors at: College of Materials Science and Technology, Shandong University of Science and Technology, Qingdao 266510, China (J. Sun);National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China (Y. Xue).;The Project National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Luoyang 471023, China;College of Materials Science and Technology, Shandong University of Science and Technology, Qingdao 266510, China;National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;

关键词: Ultrafiltration membrane;    Chromium nitride;    Catalytic reaction;    Sintering;   

DOI  :  

来源: DOAJ

【 摘 要 】

To expand the industrial application of membranes, high-performance CrN tight ultrafiltration membranes (UF) were prepared by in situ gas–solid reaction using Cr2O3 as a nanoprecursor and TiO2 as a nitriding catalyst in ammonia atmosphere. The phase composition and microstructure of CrN UF membranes were characterized by X-ray diffraction and field-emission scanning electron microscopy with energy-dispersive X-ray spectroscopy. The effects of TiO2 and sintering parameters on the crystalline phase and pore size of CrN UF membranes were investigated. The results identified Ti4+ as a key factor influencing the transformation of the Cr2O3 phase into the CrN phase. The as-prepared CrN membranes exhibited enhanced hydrophilicity, no cracks or pinholes, water flux of 121 L·m−2h−1 bar−1, and a molecular weight cut-off of 1500 Da. The membranes also had retention rates of 100% for methyl blue (50 ppm) and 90% for methylene blue (50 ppm), which almost remained constant under repeated use.

【 授权许可】

Unknown