Abstract
In this work, novel nanocomposite beads based on polyvinyl alcohol (PVA) coated polyacrylonitrile (PAN) with encapsulation of TiO2 nanoparticles (PPT) were developed successfully via a novel green synthetic method and its methylene blue (MB) removal ability by adsorption was also investigated. As-prepared nanocomposite beads were characterized by different techniques such as Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). TiO2 nanoparticles were encapsulated into the composite beads to endow the composite beads with photocatalytic ability and enhance its adsorption capacity for MB. Batch experiments with several variables such as TiO2 nanoparticle content, pH of the solution, contact time and initial MB concentration were carried out. The adsorption kinetic study revealed that the MB adsorption process agreed well with pseudo-second order model and showed 3-stage intraparticle diffusion model. The adsorption isotherm study indicated that the MB adsorption process could also be better described by Langmuir isotherm model. According to Langmuir isotherm equation, the maximum adsorption capacity and removal rate for MB was 242.13 mg g-1 and 98.4%, respectively. Moreover, the stability and reusability of as-prepared PPT beads were further explored and results demonstrated that PPT could be reused at least five times with negligible loss of sorption capacity and removal rate. Therefore, PPT is expected to be a potential candidate for effluents treatment.
Highlights
Fast population growth and aggravation of industrial activity generated a great need for clean water resources.[1]
Fourier transform infrared (FTIR) spectrometry of polyacrylonitrile with encapsulation of TiO2 NPs (PPT) showed the most typical characteristic peaks of PAN, polyvinyl alcohol (PVA), and TiO2, which indicated the successful preparation of PPT beads
New peaks appeared at 1598 and 884 cm-1 in FTIR spectrometry of PPT-methylene blue (MB), assigned to the aromatic ring vibrations and wagging vibration of C–H in aromatic ring of MB dye,[44] which indicated the functional groups participated in adsorption process
Summary
Fast population growth and aggravation of industrial activity generated a great need for clean water resources.[1]. PVA coated polyacrylonitrile with encapsulation of TiO2 NPs (PPT) organic/inorganic nanocomposite beads were developed with green reagents-water as gelation agent for effective removal of MB. This is the first time PAN/PVA/ TiO2 nanocomposite adsorbent beads were developed for effective removal of MB.
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