Preparation and phenol captivating properties of polyvinylpyrrolidone‐montmorillonite hybrid materials

Abstract

ABSTRACT:Montmorillonite minerals were modified in two distinct steps in order to remove hydroxlated toxicants from the aqueous environment. At first, the montmorillonite minerals were acrylated with the silylating agent ␥-methcaryloxypropyl trimethoxysilane to give a product denoted as TAY-10. In the second step these materials readily reacted with vinylpyrrolidone to form copolymers covalently bonded to the clay. All hybrid materials were characterized by FTIR spectroscopy, thermogravimetry, X-ray diffractometry, SEM, and differential thermal analysis. The original montmorillonite structure was maintained for the copolymer modified surfaces. Different loadings of polyvinylpyrrolidone (PVP) were examined to arrive at the optimal conditions for the removal of toxicants from the aqueous environment. The presence of the PVP enhanced the adsorption capacity of the clay toward phenolic compounds from solution as evidenced by the retention percent that was as high as 98.9%. These results demonstrated the feasibility of utilizing a PVP modified clay as a thermally recyclable adsorbent for environmental pollutants.

Effects of solution pH on adsorption of chlorophenols by cross‐linked polyvinyl pyrrolidone (PVP XL) polymers

“…Adsorption of 4-chlorphenol (CP) on PVP-modified montmorillonite increased linearly with the amount of PVP intercalation and was attributed to solubilization of CP in the dense PVP-adsorbed fraction within montmorillonite [16]. The intercalated PVP in montmorillonite also enhanced the removal of phenolic compounds from water [17], anionic surfactant sodium dodecyl sulfate from water [16], as well as polyphenols from beer [18].…”

Mechanisms of Catalytic Activity in Heavily Coated Hydrocracking Catalysts

“…Pillared clays have been tested in several applications: as catalysts for heavy oil upgrading [9][10][11], polyethylene catalytic cracking [12], denox processes [13], clean up of aqueous environments [14,15] and sorption of humic substances [16].…”

Estudo do processo de intercalação via solução PVP-bentonita: a avaliação da influência do tempo reacional, da proporção de polímero-argila e da massa molar média

“…Há estudos da adsorção da PVP em sílica [16,17] , em alumina [18,19] , em caulinita [20] e em zircônio [21] . Francis e Levy [30] foram os primeiros pesquisadores a estudar a adsorção da PVP em montmorilonita, embora somente bastante tempo depois a investigação da natureza desta ligação viesse a ser realizada [22,23] . Em 2003 foram preparados, com sucesso, nanocompósitos, do tipo intercalado, via solução, PVP-organoargila [9] .…”