Poly(vinyl alcohol) Membranes Cross‐linked with Maleic Anhydride and 2,5‐Furandicarboxylic Acid: Conventional Heating and Microwave Irradiation

2020 ◽  
Vol 5 (16) ◽  
pp. 4826-4838
Author(s):  
David Salgado‐Chavarría ◽  
Joaquín Palacios‐Alquisira
Keyword(s):  
Maleic Anhydride ◽  
Microwave Irradiation ◽  
Vinyl Alcohol ◽  
Conventional Heating ◽  
Poly Vinyl Alcohol ◽  
Furandicarboxylic Acid

scholarly journals Uncommon Sorption Mechanism of Aromatic Compounds onto Poly(Vinyl Alcohol)/Chitosan/Maleic Anhydride-β-Cyclodextrin Hydrogels

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 877 ◽  
Author(s):  
Cesar M. C. Filho ◽  
Pedro V. A. Bueno ◽  
Alan F. Y. Matsushita ◽  
Bruno H. Vilsinski ◽  
Adley F. Rubira ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Aromatic Hydrocarbons ◽  
Aromatic Compounds ◽  
Vinyl Alcohol ◽  
Environmental Pollutants ◽  
Poly Vinyl Alcohol ◽  
Healthy Environment ◽  
First Order Kinetics ◽  
Hydrogel Matrix ◽  
Polycyclic Aromatic

Aromatic hydrocarbons are extensive environmental pollutants occurring in both water and air media, and their removal is a priority effort for a healthy environment. The use of adsorbents is among the several strategies used for the remediation of these compounds. In this paper, we aim the synthesis of an amphiphilic hydrogel with the potential for the simultaneous sorption of a set of monocyclic and polycyclic aromatic hydrocarbons associated with toxicity effects in humans. Thus, we start by the synthesis of a copolymer-based in chitosan and β-cyclodextrin previously functionalized with the maleic anhydride. The presence of β-cyclodextrin will confer the ability to interact with hydrophobic compounds. The resulting material is posteriorly incorporated in a cryogel of poly(vinyl alcohol) matrix. We aim to improve the amphiphilic ability of the hydrogel matrix. The obtained hydrogel was characterized by swelling water kinetics, thermogravimetric analysis, rheological measurements, and scanning electron microscopy. The sorption of aromatic hydrocarbons onto the gel is characterized by pseudo-first-order kinetics and Henry isotherm, suggesting a physisorption mechanism. The results show that the presence of maleic anhydride-β-cyclodextrin and chitosan into hydrogels leads to an increase in the removal efficiency of the aromatic compounds. Additionally, the capacity of this hydrogel for removing these pollutants from a fossil fuel sample has also been tested.

In situ reduction of graphene oxide in the poly (vinyl alcohol) matrix via microwave irradiation

2017 ◽  
Vol 40 (1) ◽  
pp. 170-178 ◽  
Author(s):  
Jianwei Zhang ◽  
Yonglyu He ◽  
Pu Zhu ◽  
Shaofeng Lin ◽  
Su Ju ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Microwave Irradiation ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
In Situ Reduction
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