A novel fabricated polyvinyl alcohol/ bentonite nanocomposite hydrogel generated into colloidal gas aphron
2022
Ghafelebashi, Amirhossein | Khosravani, Shahriar | Kazemi, Mohammad H. | Rajabi, Fatemeh | Amiri, M.C.
Polyvinyl alcohol/bentonite (PVA- Ben) nanocomposite hydrogel is commonly used as an adsorbent for removing many dye residues in wastewater treatment. In the present study, a novel polyvinyl alcohol/bentonite nanocomposite, (CGA-PVA-Ben) hydrogel, is fabricated by mixing polyvinyl alcohol and bentonite dispersions in the presence of a high shear force via a colloidal gas aphron (CGA) generator. X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS), and Fourier Transform Infrared (FTIR) spectroscopy methods are used to characterize both the novel (CGA-PVA-Ben) and also conventional (PVA-Ben) nanocomposite hydrogels. The results of EDS, XRD, and FTIR analyses show that the (CGA-PVA-Ben) hydrogel has the same bonds, functional groups, and exact composition as the (PVA-Ben) hydrogel. However, FE-SEM analysis demonstrates that the (CGA-PVA-Ben) has more porous and uneven surfaces. The presence of high shear forces during the mixing of polyvinyl alcohol and bentonite reagents in aphron generator reduces the mass density of hydrogel. Therefore, compared with neat hydrogel adsorbent, i.e., (PVA-Ben), the (CGA-PVA-Ben) has a unique characteristic behavior which is the adsorbent floatability after the adsorption process. This remarkable feature provides an alternative method in adsorption technology and it is an interesting advantage for easy removal of adsorbent from the contaminated effluents. Details of the adsorption characterization of this novel fabricated polyvinyl alcohol/ bentonite nanocomposite hydrogels will be discussed in a follow-up research paper.
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