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Microwave induced synthesis of graft copolymer of binary vinyl monomer mixtures onto delignified Grewia optiva fiber: application in dye removal.

Gupta VK, Pathania D, Priya B, Singha AS, Sharma G - Front Chem (2014)

Bottom Line: Grafting method, through microwave radiation technique is very effective in terms of time consumption, cost effectiveness and environmental friendliness.The experimental results inferred that the optimal concentrations for the comonomers to the optimized primary monomer was observed to be 3.19 mol/L × 10(-1) for EMA and 2.76 mol/L × 10(-1) for EA.The grafted samples have been explored for the adsorption of hazardous methylene dye from aqueous system.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Indian Institute of Technology Roorkee Roorkee, India.

ABSTRACT
Grafting method, through microwave radiation technique is very effective in terms of time consumption, cost effectiveness and environmental friendliness. Via this method, delignified Grewia optiva identified as a waste biomass, was graft copolymerized with methylmethacrylate (MMA) as an principal monomer in a binary mixture of ethyl methacrylate (EMA) and ethyl acrylate (EA) under microwave irradiation (MWR) using ascorbic acid/H2O2 as an initiator system. The concentration of the comonomer was optimized to maximize the graft yield with respect to the primary monomer. Maximum graft yield (86.32%) was found for dGo-poly(MMA-co-EA) binary mixture as compared to other synthesized copolymer. The experimental results inferred that the optimal concentrations for the comonomers to the optimized primary monomer was observed to be 3.19 mol/L × 10(-1) for EMA and 2.76 mol/L × 10(-1) for EA. Delignified and graft copolymerized fiber were subjected to evaluation of physicochemical properties such as swelling behavior and chemical resistance. The synthesized graft copolymers were characterized with Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and X-ray diffraction techniques. Thermal stability of dGo-poly(MMA-co-EA) was found to be more as compared to the delignified Grewia optiva fiber and other graft copolymers. Although the grafting technique was found to decrease percentage crystallinity and crystallinity index among the graft copolymers but there was significant increase in their acid/base and thermal resistance properties. The grafted samples have been explored for the adsorption of hazardous methylene dye from aqueous system.

No MeSH data available.


Related in: MedlinePlus

Scanning electron micrographs of (A) raw Grewia optiva fibre, (B) delignified Grewia optiva fibre, (C) dGo-g-poly(MMA), (D) dGo-g-poly(MMA-co-EMA), and (E) dGo-g-poly(MMA-co-EA).
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Figure 3: Scanning electron micrographs of (A) raw Grewia optiva fibre, (B) delignified Grewia optiva fibre, (C) dGo-g-poly(MMA), (D) dGo-g-poly(MMA-co-EMA), and (E) dGo-g-poly(MMA-co-EA).

Mentions: The scanning electron micrographs of raw, delignified and poly (MMA) grafted delignified Grewia optiva fibers show a clear cut distinction in, Figures 3A–E. This provides a strong evidence for the change in the surface morphology of the fibers as a result of delignification and grafting of the monomer onto the cellulosic backbone. It is quite evident from the micrographs that delignified fibers (Figure 3B) are smoother than raw fiber (Figure 3A) and surface of graft copolymerized fibers (Figures 3C–E) is visibly rough due to the incorporation of polymeric chains onto the fiber backbone (Singha et al., 2014). This change in morphology ultimately causes changes in the properties of the raw Grewia optiva fibers onto graft copolymerization.


Microwave induced synthesis of graft copolymer of binary vinyl monomer mixtures onto delignified Grewia optiva fiber: application in dye removal.

Gupta VK, Pathania D, Priya B, Singha AS, Sharma G - Front Chem (2014)

Scanning electron micrographs of (A) raw Grewia optiva fibre, (B) delignified Grewia optiva fibre, (C) dGo-g-poly(MMA), (D) dGo-g-poly(MMA-co-EMA), and (E) dGo-g-poly(MMA-co-EA).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4127470&req=5

Figure 3: Scanning electron micrographs of (A) raw Grewia optiva fibre, (B) delignified Grewia optiva fibre, (C) dGo-g-poly(MMA), (D) dGo-g-poly(MMA-co-EMA), and (E) dGo-g-poly(MMA-co-EA).
Mentions: The scanning electron micrographs of raw, delignified and poly (MMA) grafted delignified Grewia optiva fibers show a clear cut distinction in, Figures 3A–E. This provides a strong evidence for the change in the surface morphology of the fibers as a result of delignification and grafting of the monomer onto the cellulosic backbone. It is quite evident from the micrographs that delignified fibers (Figure 3B) are smoother than raw fiber (Figure 3A) and surface of graft copolymerized fibers (Figures 3C–E) is visibly rough due to the incorporation of polymeric chains onto the fiber backbone (Singha et al., 2014). This change in morphology ultimately causes changes in the properties of the raw Grewia optiva fibers onto graft copolymerization.

Bottom Line: Grafting method, through microwave radiation technique is very effective in terms of time consumption, cost effectiveness and environmental friendliness.The experimental results inferred that the optimal concentrations for the comonomers to the optimized primary monomer was observed to be 3.19 mol/L × 10(-1) for EMA and 2.76 mol/L × 10(-1) for EA.The grafted samples have been explored for the adsorption of hazardous methylene dye from aqueous system.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Indian Institute of Technology Roorkee Roorkee, India.

ABSTRACT
Grafting method, through microwave radiation technique is very effective in terms of time consumption, cost effectiveness and environmental friendliness. Via this method, delignified Grewia optiva identified as a waste biomass, was graft copolymerized with methylmethacrylate (MMA) as an principal monomer in a binary mixture of ethyl methacrylate (EMA) and ethyl acrylate (EA) under microwave irradiation (MWR) using ascorbic acid/H2O2 as an initiator system. The concentration of the comonomer was optimized to maximize the graft yield with respect to the primary monomer. Maximum graft yield (86.32%) was found for dGo-poly(MMA-co-EA) binary mixture as compared to other synthesized copolymer. The experimental results inferred that the optimal concentrations for the comonomers to the optimized primary monomer was observed to be 3.19 mol/L × 10(-1) for EMA and 2.76 mol/L × 10(-1) for EA. Delignified and graft copolymerized fiber were subjected to evaluation of physicochemical properties such as swelling behavior and chemical resistance. The synthesized graft copolymers were characterized with Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and X-ray diffraction techniques. Thermal stability of dGo-poly(MMA-co-EA) was found to be more as compared to the delignified Grewia optiva fiber and other graft copolymers. Although the grafting technique was found to decrease percentage crystallinity and crystallinity index among the graft copolymers but there was significant increase in their acid/base and thermal resistance properties. The grafted samples have been explored for the adsorption of hazardous methylene dye from aqueous system.

No MeSH data available.


Related in: MedlinePlus