Investigation on selective adsorption of Hg(II) ions using 4-vinyl pyridine grafted poly(ethylene terephthalate) fiber

2011 ◽  
Vol 124 (2) ◽  
pp. 1256-1264 ◽  
Author(s):  
Ogün Bozkaya ◽  
Mustafa Yiğitoğlu ◽  
Metin Arslan
Keyword(s):  
Ethylene Terephthalate ◽  
Selective Adsorption ◽  
Poly Ethylene Terephthalate ◽  
Vinyl Pyridine ◽  
Poly Ethylene

Use of 4-vinylpyridine and 2-hydroxyethylmethacrylate monomer mixture grafted poly(ethylene terephthalate) fibers for removal of congo red from aqueous solution

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Metin Arslan ◽  
Mustafa Yiğitoğlu
Keyword(s):  
Congo Red ◽  
Ethylene Terephthalate ◽  
Adsorption Equilibrium ◽  
Treatment Time ◽  
Monomer Mixture ◽  
Adsorption Time ◽  
Poly Ethylene Terephthalate ◽  
Vinyl Pyridine ◽  
Pet Fibers ◽  
Poly Ethylene

AbstractIn this study, a novel fibrous adsorbent made by grafting 4-vinyl pyridine (4-VP) and 2-hydroxyethylmethacrylate (HEMA) monomer mixture onto poly(ethylene terephthalate) (PET) fibers was used for removal of Congo red (CR) in aqueous solutions by a batch equilibration technique. The influence of treatment time, pH of solution, dyes concentration, and reaction temperature on adsorbed amount was investigated. Adsorption time of 60 min. was found sufficient to reach adsorption equilibrium for CR. It was found that the adsorption isotherm of CR fits to Langmuir type isotherms. The highest adsorption capacity was found to be 11.87 mg CR per gram adsorbent. The adsorption rate of CR is much higher on the comonomers grafted PET fibers than on the ungrafted PET fibers. CR was removed 97 % when the initial dye concentration was 5 mg L-1 and 38% at 150 mg L-1 by monomers mixture grafted PET fibers. The adsorption of the dye was endothermic in nature (ΔH°=45.3 KJmol-1). It was found that the reactive fibers are stable and regenerate by acid without losing its activity.

Grafting of 4-Vinyl Pyridine onto Polyesters Initiated by Potassium Diperiodatocuprate(III)

2011 ◽  
Vol 287-290 ◽  
pp. 58-64
Author(s):  
Jian Ping Zhang ◽  
Yong Guang Zhao ◽  
Ying Zhao ◽  
Li Man Liang ◽  
Yan Jun Ren ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Heavy Metal Ions ◽  
Ethylene Terephthalate ◽  
Graft Copolymerization ◽  
Redox System ◽  
Initiator Concentration ◽  
Spectra Analysis ◽  
Poly Ethylene Terephthalate ◽  
Vinyl Pyridine ◽  
Poly Ethylene

In this article, the graft copolymerization of 4-vinyl pyridine onto poly (ethylene terephthalate)(PET) via the potassium diperiodacuprate(III)–PET redox system as an initiator was investigated in an alkaline medium. The graft copolymer was characterized with Fourier-transform infrared spectra analysis. A mechanism is proposed to explain the generation of radicals and the initiation. The effects of reaction variables, such as the initiator concentration, the ratio of monomer to PET, pH, and reaction temperature and time, are investigated, and the grafting conditions are optimized. Graft copolymers with high grafting efficiency are obtained, thus indicating that potassium diperiodacuprate(III)-PET redox system is an efficient initiator for this graft copolymerization. The quaternized PET-g-PVP (QPEVP) is proved to be an excellent adsorbent to heavy metal ions.

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