Preparation of MnO2 Loaded Hydrothermal Carbon-coated Electrospun PAN Fiber Membranes for Highly Efficient Adsorption and Separation of Cationic Dye

Abstract

Hydrothermal carbonaceous materials and MnO2 have been proved to be promising adsorbents to remove organic dyes from wastewater. In this study, flexible MnO2 loaded hydrothermal carbon-coated electrospun polyacrylonitrile(AC/MnO2/PAN) fiber membranes were fabricated by a facile one-step hydrothermal method and activated by NaOH solution. The composite fibers exhibited large adsorption capacity toward cationic dyes and excellent mechanical properties. The adsorption performance can be fitted well with pseudo-second-order model and Langmuir isotherm model. The maximum adsorption for methylene blue(MB), methyl violet(MV) and malachite green(MG) are 1173.27，1106.31 and 1129.89 mg/g, respectively, according to Langmuir fitting. The AC/MnO2/PAN fiber membrane also showed satisfactory performances for selective adsorption and recyclability. In addition, based on selective adsorption, the AC/MnO2/PAN fiber membranes that are repulsive to the anionic dye methyl orange(MO) can separate the MB/MO mixture solution by dynamic filtration. Thus, this work not only provides a facile strategy to fabricate large capacity adsorbents, but also demonstrates the potential applications in the dye wastewater treatment field.

Porous Cationic Electrospun Fibers with Sufficient Adsorption Sites for Effective and Continuous 99TcO4− Uptake

“…[19][20][21] Together with these attractive properties, electrospun fibers are competitive fibrous adsorbents or adsorptive membranes for contaminant removal from water. [22][23][24] To improve the selectivity of pure electrospun polymer fibers, grafting specific binding sites is a straightforward strategy. [25,26] For instance, amidoxime groups have been grafted onto electrospun polyacrylonitrile fibers for uranium extraction.…”

Research on Downhole Gas Separation Method Based on a PDMS Separation Membrane

“…Representative membranes include polyimide (PI), polytetrafluoroethylene (PTFE), fluorinated ethylene propylene (PET), and polydimethylsiloxane (PDMS) membranes. The main properties of these membranes are summarized in Table 1 [29][30][31].…”