Zhenying Li,Yanze Yang,Xu Chen,Yulu Hu,Xia Sun,Jiliang Xie,Tao Yang
Background:As a typical refractory cationic dyes, Rhodamine B (RhB), poses a significant challenge in aquatic environment. Methods:To address this issue, this study fabricated a novel TBO-PSPH/MXene composite membrane by covalently grafting the silane-based N-halamine poly[5,5-dimethyl-3-(3’-triethoxysilylpropyl)hydantoin](PSPH) onto the surface of MXene, followed by the intercalation of the polycyclic dye Toluidine Blue O (TBO) into MXene interlayers. The composite membrane was characterized by XRD, XPS, FT-IR, N 2 adsorption /desorption, AFM and FESEM. Signifiicant Findings:The results demonstrated that the intercalation of TBO significantly enhanced structural stability of the membrane as well as the incorporation of PSPH reduced the surface negative charges and improved hydrophilicity of the membrane. Separation experiments with a 15 mg/L RhB solution at pH 1 and room temperature (RT) demonstrated a high rejection of 97.3% and a water flux of 4.63 L/(m²·h·bar). Notably, the incorporation of 10% NaCl significantly enhanced membrane performance, elevating RhB rejection to 98.9% while increasing water flux to 6.29 L/(m²·h·bar). The separation mechanism is attributed to synergistic effects of electrostatic repulsion, size-sieving, steric hindrance, and adsorption. This work provides a promising strategy for developing high-performance MXene membranes for treating challenging dye wastewater under various conditions.
Nano-structured membranes with great properties are promising alternatives for water purification. However, it remains a challenge to develop such materials, especially for purifying water contaminated by pathogenic microbes. In this work, a newly-designed nanofibrous membrane with rechargeable biocidal function was prepared through grafting poly(vinyl alcohol- co -ethylene) (EVOH) with poly[5,5-dimethyl-3-(3′-triethoxysilylpropyl)-hydratoin] (PSPH) in the form of electrospun nanofibers . The proposed strategy intrinsically allows the N -halamine compounds to homogeneously and covalently integrate with EVOH nanofibers, bringing the membranes efficiently antimicrobial capability and durability. Moreover, the resultant chlorinated membranes exhibit characteristics of good mechanical property, superior hydrophilicity, renewable chlorination activity (>4000 ppm) and outstanding microbicidal performance (>99.999%), suggesting the composite materials could be used as filtration layers for bacteria-contaminated water disinfection with a favorable flux (>2000 L m −2 h −1 ). The successful fabrication strategy provides innovative insights into exploring other antifouling nanofibrous materials in a renewable way.
危险品化学品经营许可证（带存储）