Abstract
In this work, a free-standing sodium titanate ultralong nanotube membrane for multifunctional water purification has been prepared. For obtaining this free-standing membrane with good tenacity, one-dimensional (1D) sodium titanate ultralong nanotubes with a diameter of about 48 nm and length of hundreds of micrometers were prepared from TiO2 nanoparticles by a stirring hydrothermal method, which can be easily assembled into 2D membranes by facile vacuum filtration. After modified with methyltrimethoxysilane (MTMS), the free-standing membrane with hydrophobic surface possesses oil-water separation, self-cleaning and photocatalytic functions at the same time, which is favorable for the recovery of membrane and decontamination of various pollutants including oils, dust, and organic dyes from water. Furthermore, this membrane also exhibits excellent alkaline, acid, and corrosive salt resistance. This free-standing sodium titanate membrane with multifunction has potential applications in efficient wastewater purification and environmental remediation.
Highlights
Et al noted that a large amount of wastewater generates during the fabrication process of the polymeric membrane, which makes membrane separation technology not as green as it is known
Na2Ti3O7 ultralong nanotubes dispersing in ethanol with different concentrations were poured into the filter bottle and vacuum filtered for 10 min
Na2Ti3O7 Ultralong Nanotubes and Free-Standing Membrane Figure 1a is the X-ray diffraction (XRD) patterns of the product synthesized by stirring hydrothermal method
Summary
Water, arising from industrial sewage and frequent oil spill accidents, is harmful to the environment, animals, plants, and even humans and has aroused widespread concern throughout the world. The removal of intractable oil from water is a tough job [1, 2]. Many treatment methods for oily wastewater have been developed. Membrane separation technology has attracted much attention for its advantages of low energy consumption, flexibility, environmental friendliness, and high singlestage separation efficiency [3, 4]. Many researches have been carried out on improving the sustainability and efficiency of membrane separation technology. Et al noted that a large amount of wastewater generates during the fabrication process of the polymeric membrane, which makes membrane separation technology not as green as it is known. More and more 1D inorganic materials were applied for obtaining free-standing membrane owing to
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